CN110907374A - Method for detecting water quality of household water purifier - Google Patents
Method for detecting water quality of household water purifier Download PDFInfo
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- CN110907374A CN110907374A CN201911233349.9A CN201911233349A CN110907374A CN 110907374 A CN110907374 A CN 110907374A CN 201911233349 A CN201911233349 A CN 201911233349A CN 110907374 A CN110907374 A CN 110907374A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 186
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000001514 detection method Methods 0.000 claims abstract description 32
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 229910052731 fluorine Inorganic materials 0.000 claims abstract description 21
- 239000011737 fluorine Substances 0.000 claims abstract description 21
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 20
- JXBUOZMYKQDZFY-UHFFFAOYSA-N 4-hydroxybenzene-1,3-disulfonic acid Chemical compound OC1=CC=C(S(O)(=O)=O)C=C1S(O)(=O)=O JXBUOZMYKQDZFY-UHFFFAOYSA-N 0.000 claims abstract description 17
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims abstract description 14
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 claims abstract description 13
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 claims abstract description 12
- -1 fluorine ions Chemical class 0.000 claims abstract description 11
- 229910021607 Silver chloride Inorganic materials 0.000 claims abstract description 8
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 8
- FYDKNKUEBJQCCN-UHFFFAOYSA-N lanthanum(3+);trinitrate Chemical compound [La+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O FYDKNKUEBJQCCN-UHFFFAOYSA-N 0.000 claims abstract description 8
- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 claims abstract description 8
- XFXPMWWXUTWYJX-UHFFFAOYSA-N Cyanide Chemical compound N#[C-] XFXPMWWXUTWYJX-UHFFFAOYSA-N 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 5
- 239000002244 precipitate Substances 0.000 claims description 26
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 12
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 10
- 229910001626 barium chloride Inorganic materials 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- 239000000725 suspension Substances 0.000 claims description 9
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 7
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 6
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 238000002156 mixing Methods 0.000 claims description 6
- 239000003381 stabilizer Substances 0.000 claims description 6
- 229910002651 NO3 Inorganic materials 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- 150000002500 ions Chemical class 0.000 claims description 4
- 229910001961 silver nitrate Inorganic materials 0.000 claims description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 claims description 3
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 229940103272 aluminum potassium sulfate Drugs 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- LBJNMUFDOHXDFG-UHFFFAOYSA-N copper;hydrate Chemical compound O.[Cu].[Cu] LBJNMUFDOHXDFG-UHFFFAOYSA-N 0.000 claims description 3
- 229910001447 ferric ion Inorganic materials 0.000 claims description 3
- 230000031700 light absorption Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000011859 microparticle Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- GRLPQNLYRHEGIJ-UHFFFAOYSA-J potassium aluminium sulfate Chemical compound [Al+3].[K+].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O GRLPQNLYRHEGIJ-UHFFFAOYSA-J 0.000 claims description 3
- 239000011780 sodium chloride Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 3
- HIFJUMGIHIZEPX-UHFFFAOYSA-N sulfuric acid;sulfur trioxide Chemical compound O=S(=O)=O.OS(O)(=O)=O HIFJUMGIHIZEPX-UHFFFAOYSA-N 0.000 claims description 3
- 238000004448 titration Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 abstract description 2
- 238000007254 oxidation reaction Methods 0.000 abstract description 2
- 235000020188 drinking water Nutrition 0.000 description 14
- 239000003651 drinking water Substances 0.000 description 14
- 150000001805 chlorine compounds Chemical class 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 239000012528 membrane Substances 0.000 description 5
- IOVCWXUNBOPUCH-UHFFFAOYSA-M Nitrite anion Chemical compound [O-]N=O IOVCWXUNBOPUCH-UHFFFAOYSA-M 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 210000001035 gastrointestinal tract Anatomy 0.000 description 4
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 2
- 206010012735 Diarrhoea Diseases 0.000 description 2
- 206010016818 Fluorosis Diseases 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 239000000460 chlorine Substances 0.000 description 2
- 229910052801 chlorine Inorganic materials 0.000 description 2
- 208000004042 dental fluorosis Diseases 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 150000002825 nitriles Chemical class 0.000 description 2
- 231100000572 poisoning Toxicity 0.000 description 2
- 230000000607 poisoning effect Effects 0.000 description 2
- 238000001223 reverse osmosis Methods 0.000 description 2
- 229910001415 sodium ion Inorganic materials 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 238000000108 ultra-filtration Methods 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910021653 sulphate ion Inorganic materials 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/29—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using visual detection
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/78—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a change of colour
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/82—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a precipitate or turbidity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/77—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator
- G01N21/82—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated by observing the effect on a chemical indicator producing a precipitate or turbidity
- G01N21/83—Turbidimetric titration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N31/00—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods
- G01N31/16—Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted for such methods using titration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The invention discloses a method for detecting the water quality of a household water purifier, which comprises the following steps of taking four 100mL portions of water purified by the water purifier from the water outlet end of the water purifier, and carefully observing the color of the water. Performing preliminary judgment according to the color of water, taking one part of water, performing chloride detection, taking one part of water, performing sulfate detection, taking one part of water, performing nitrate nitrogen detection, taking one part of water, and performing fluoride detection; according to the method, water is initially detected by observing the color of the water, hydrogen peroxide is dripped into the water, cyanide reacts with the hydrogen peroxide under the strong oxidation action of the hydrogen peroxide to precipitate silver chloride, phenol disulfonic acid reacts with nitrate nitrogen in the water under an alkaline environment, colorimetric determination is carried out, fluorine ions react with the fluorine reagent and lanthanum nitrate under the action of a buffer medium by adding the buffer medium, the fluorine reagent and a lanthanum nitrate solution, and the detection result is high in accuracy.
Description
Technical Field
The invention relates to the technical field of water quality detection, in particular to a method for detecting the water quality of a household water purifier.
Background
The water purifier is also called water purifier and water quality purifier, and is water treatment equipment for deeply filtering and purifying water according to the use requirement of water. The water purifier is generally used as a small purifier for household use. The technical core is a filtering membrane in a filter element device, and the current main technology is derived from an ultrafiltration membrane and an RO reverse osmosis membrane. The water purifier has the function of removing floating substances, heavy metals, bacteria, viruses, residual chlorine, silt, rust, microorganisms and the like in filtered water, and has a high-precision filtering technology, the first stage of the five-stage filtering technology of the household water purifier is a filter element also called a PP cotton filter element (PPF), the second stage is a granular activated carbon (UDF) filter element, the third stage is a precision compression activated Carbon (CTO) filter element, the fourth stage is a reverse osmosis membrane or an ultrafiltration membrane, and the fifth stage is rear activated carbon (small T33). The water purifier is suitable for regions with serious tap water pollution, can filter residual chlorine in the conventional tap water, and can improve the taste of the water.
After the purifier used a period of time, certain loss can take place for inside, and the water purification function can receive certain influence, consequently general every interval period all need detect the water after the purifier purifies, judges whether the work of purifier is normal, and detection to water generally mainly is aquatic chloride content detection, aquatic sulphate content detection, aquatic nitrate nitrogen content detection and aquatic fluoride content detection, and traditional detection method has following defect:
when the chloride in the water is detected, cyanide in the water reacts with a silver nitrate solution to generate precipitates, so that a detection result is influenced to a certain extent, and the accuracy of the detection result is low; when detecting nitrate nitrogen in water, acidic ions in water can influence the detection result, and when detecting fluoride in water, the detection steps are more complicated, and the detection result is very easy to be influenced by external factors.
Based on the above, the invention designs a method for detecting the water quality of a household water purifier, so as to solve the above mentioned problems.
Disclosure of Invention
The invention aims to provide a method for detecting the water quality of a household water purifier, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a method for detecting the water quality of a household water purifier comprises the following steps:
s1, taking four 100mL portions of water purified by the water purifier from the water outlet end of the water purifier, carefully observing the color of the water, wherein if the color of the water is yellowish, more ferric ions are contained in the water, if the color of the water is blue, more cupric ions are contained in the water, and if the transparency of the water is low, more suspended microparticles are contained in the water;
s2, taking 100mL of water, detecting chlorides, wherein the content of chlorides in the water can affect the quality of the drinking water, the chlorides can not be too high as drinking water in life of people, if the content of the chlorides is too high, the chlorides can generate chemical reaction with sodium ions and magnesium ions in the water, so that the drinking water can generate different taste changes, when the taste of the drinking water is too heavy, the drinking water can not be used as normal drinking water, dripping silver nitrate solution into the taken water for titration detection, dripping hydrogen peroxide into the taken water, observing whether white precipitates are generated or not, filtering the generated white precipitates, drying, weighing the weight of the white precipitates to obtain silver chloride, calculating the content of the chlorides in the water by the weight of the silver chloride, enabling the hydrogen peroxide to react with cyanides in the water, and preventing the cyanide precipitates, the detection result is influenced;
s3, taking one part of 100mL water to detect sulfate, wherein a small amount of sulfate exists in drinking water generally, the small amount of sulfate does not cause great harm to human bodies, when the content of sulfate in the water exceeds a certain concentration, the sulfate can cause harm to the intestinal tract system of people and cause adverse conditions such as diarrhea to people, dividing the taken 100mL water into two parts of 50mL water, respectively adding a stabilizing agent into the two parts of 50mL water, respectively weighing two parts of 0.2g of barium chloride powder by using a precision balance, respectively adding the two parts of barium chloride into the two parts of 50mL water, then mixing and stirring to quickly dissolve the barium chloride powder, observing whether white precipitate is generated, filtering out the generated white precipitate, drying, weighing the weight of the white precipitate to obtain barium sulfate, calculating the sulfate in the water by the weight of the barium sulfate, obtaining the content of sulfate;
s4, taking a 100mL portion of water, detecting nitrate nitrogen, reacting the nitrate nitrogen in the water to generate nitrate under certain conditions, generating nitrite under the action of the human digestive tract and oral environment, and causing human poisoning by long-term intake of the nitrite, adding a proper amount of pure water aluminum hydroxide suspension into the taken water, adjusting the pH value to be about 8, adding phenoldisulfonic acid into the water, reacting the phenoldisulfonic acid with nitrate ions to generate nitrodisulfonic acid phenol, generating a yellow compound under an alkaline condition, and performing colorimetric determination at a wavelength of 410nm by using a spectrophotometer to obtain the content of the nitrate nitrogen in the water;
s5, taking 100mL of water, detecting fluoride, wherein fluorine elements widely exist in the water, a proper amount of fluorine is harmless to human bodies, when the fluorine content in the water is too high, diseases such as fluorosis and the like can be caused, and the life of people is seriously harmed, adding a buffer medium into the taken water, then adding a fluorine reagent and a lanthanum nitrate solution into the taken water, reacting fluorine ions with the fluorine reagent and the lanthanum nitrate under the action of the buffer medium to generate a blue ternary complex, wherein the color intensity is in direct proportion to the concentration of the fluorine ions, and the fluoride can be quantitatively determined at the wavelength of 620nm by using a spectrophotometer.
Preferably, the stabilizing agent is a mixture of sodium chloride and glycerol, so that the reaction is carried out more stably, and the detection result is more accurate.
Preferably, the configuration process of the phenol disulfonic acid is as follows: weighing a certain amount of phenol, placing the phenol in a flask, adding a proper amount of concentrated sulfuric acid to dissolve the phenol, adding a proper amount of fuming sulfuric acid, fully mixing, and heating in boiling water for 2 hours to obtain a phenoldisulfonic acid solution.
Preferably, the phenoldisulfonic acid solution is a light brown thick liquid.
Preferably, the preparation process of the aluminum hydroxide suspension comprises the following steps: dissolving a certain amount of aluminum potassium sulfate in water, heating to 60 ℃, then slowly adding a proper amount of concentrated ammonia water, standing for 1h, repeatedly washing precipitates by an inclined method, and finally adding a proper amount of pure water to obtain a suspension.
Preferably, the buffer medium is an acetate solution at ph 4.1.
Preferably, in the fluoride measurement, when the developed color is bluish during the measurement by the spectrophotometer, the light absorption value is low, the deviation of the detection result is large, and the water should be diluted to ensure that the developed color is pink or pink reddish.
Preferably, the spectrophotometer is a type 721 or type 722 spectrophotometer.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the water is preliminarily detected by observing the color of the water, hydrogen peroxide is dripped into the water, cyanide reacts with the hydrogen peroxide under the strong oxidation action of the hydrogen peroxide to precipitate silver chloride, the accuracy of a detection result is ensured, the sulfate in the water is detected by barium chloride powder, phenoldisulfonic acid reacts with nitrate nitrogen in the water under an alkaline environment, and then colorimetric determination is carried out, so that the detection result is more accurate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme of a method for detecting the water quality of a household water purifier, which comprises the following steps: the method comprises the following steps:
s1, taking four 100mL portions of water purified by the water purifier from the water outlet end of the water purifier, carefully observing the color of the water, wherein if the color of the water is yellowish, more ferric ions are contained in the water, if the color of the water is blue, more cupric ions are contained in the water, and if the transparency of the water is low, more suspended microparticles are contained in the water;
s2, taking 100mL of water, detecting chlorides, wherein the content of chlorides in the water can affect the quality of the drinking water, the chlorides can not be too high as drinking water in life of people, if the content of the chlorides is too high, the chlorides can generate chemical reaction with sodium ions and magnesium ions in the water, so that the drinking water can generate different taste changes, when the taste of the drinking water is too heavy, the drinking water can not be used as normal drinking water, dripping silver nitrate solution into the taken water for titration detection, dripping hydrogen peroxide into the taken water, observing whether white precipitates are generated or not, filtering the generated white precipitates, drying, weighing the weight of the white precipitates to obtain silver chloride, calculating the content of the chlorides in the water by the weight of the silver chloride, enabling the hydrogen peroxide to react with cyanides in the water, and preventing the cyanide precipitates, the detection result is influenced;
s3, taking one part of 100mL water to detect sulfate, wherein a small amount of sulfate exists in drinking water generally, the small amount of sulfate does not cause great harm to human bodies, when the content of sulfate in the water exceeds a certain concentration, the sulfate can cause harm to the intestinal tract system of people and cause adverse conditions such as diarrhea to people, dividing the taken 100mL water into two parts of 50mL water, respectively adding a stabilizing agent into the two parts of 50mL water, respectively weighing two parts of 0.2g of barium chloride powder by using a precision balance, respectively adding the two parts of barium chloride into the two parts of 50mL water, then mixing and stirring to quickly dissolve the barium chloride powder, observing whether white precipitate is generated, filtering out the generated white precipitate, drying, weighing the weight of the white precipitate to obtain barium sulfate, calculating the sulfate in the water by the weight of the barium sulfate, obtaining the content of sulfate;
s4, taking a 100mL portion of water, detecting nitrate nitrogen, reacting the nitrate nitrogen in the water to generate nitrate under certain conditions, generating nitrite under the action of the human digestive tract and oral environment, and causing human poisoning by long-term intake of the nitrite, adding a proper amount of pure water aluminum hydroxide suspension into the taken water, adjusting the pH value to be about 8, adding phenoldisulfonic acid into the water, reacting the phenoldisulfonic acid with nitrate ions to generate nitrodisulfonic acid phenol, generating a yellow compound under an alkaline condition, and performing colorimetric determination at a wavelength of 410nm by using a spectrophotometer to obtain the content of the nitrate nitrogen in the water;
s5, taking 100mL of water, detecting fluoride, wherein fluorine elements widely exist in the water, a proper amount of fluorine is harmless to human bodies, when the fluorine content in the water is too high, diseases such as fluorosis and the like can be caused, and the life of people is seriously harmed, adding a buffer medium into the taken water, then adding a fluorine reagent and a lanthanum nitrate solution into the taken water, reacting fluorine ions with the fluorine reagent and the lanthanum nitrate under the action of the buffer medium to generate a blue ternary complex, wherein the color intensity is in direct proportion to the concentration of the fluorine ions, and the fluoride can be quantitatively determined at the wavelength of 620nm by using a spectrophotometer.
Wherein, the stabilizer is a mixture of sodium chloride and glycerol, so that the reaction is carried out more stably, and the detection result is more accurate.
Wherein the preparation process of the phenol disulfonic acid comprises the following steps: weighing a certain amount of phenol, placing the phenol in a flask, adding a proper amount of concentrated sulfuric acid to dissolve the phenol, adding a proper amount of fuming sulfuric acid, fully mixing, heating in boiling water for 2 hours to obtain a phenoldisulfonic acid solution, wherein the phenoldisulfonic acid solution is a light brown thick liquid; the preparation process of the aluminum hydroxide suspension comprises the following steps: dissolving a certain amount of aluminum potassium sulfate in water, heating to 60 ℃, then slowly adding a proper amount of concentrated ammonia water, standing for 1h, repeatedly washing precipitates by an inclined method, and finally adding a proper amount of pure water to obtain a suspension.
Wherein the buffer medium is acetate solution with pH 4.1; in fluoride measurement, when the developed color is bluish during measurement by a spectrophotometer, the light absorption value is low at the moment, the deviation of the detection result is large, and the water is diluted to ensure that the developed color is pink or pink reddish; the spectrophotometer is a type 721 or type 722 spectrophotometer.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (8)
1. A method for detecting the water quality of a household water purifier is characterized by comprising the following steps:
s1, taking four 100mL portions of water purified by the water purifier from the water outlet end of the water purifier, carefully observing the color of the water, wherein if the color of the water is yellowish, more ferric ions are contained in the water, if the color of the water is blue, more cupric ions are contained in the water, and if the transparency of the water is low, more suspended microparticles are contained in the water;
s2, taking 100mL of water, carrying out chloride detection, dropping a silver nitrate solution into the taken water for titration detection, dropping hydrogen peroxide into the taken water, observing whether a white precipitate is generated, filtering the generated white precipitate, carrying out drying treatment, weighing the weight of the white precipitate, wherein the precipitate is silver chloride, calculating the content of the chloride in the water by the weight of the silver chloride, and the hydrogen peroxide can react with cyanide in the water to prevent the cyanide precipitate from occurring and influence the detection result;
s3, taking one part of 100mL water, detecting sulfate, dividing the taken 100mL water into two parts of 50mL water, adding a stabilizer into the two parts of 50mL water respectively, weighing two parts of 0.2g barium chloride powder by using a precision balance respectively, adding the two parts of barium chloride into the two parts of 50mL water respectively, mixing and stirring to quickly dissolve the barium chloride powder, observing whether a white precipitate is generated, filtering the generated white precipitate, drying, weighing the weight of the white precipitate to obtain barium sulfate, and calculating sulfate in the water by the weight of the barium sulfate to obtain the content of the sulfate;
s4, taking 100mL of water, detecting nitrate nitrogen, adding a proper amount of pure water aluminum hydroxide suspension into the taken water, adjusting the pH value to be about 8, adding phenoldisulfonic acid into the water, reacting the phenoldisulfonic acid with nitrate ions to produce nitrodisulfonic acid phenol, generating a yellow compound under an alkaline condition, and carrying out colorimetric determination at a wavelength of 410nm by using a spectrophotometer to obtain the content of the nitrate nitrogen in the water;
s5, taking 100mL of water, detecting fluoride, adding a buffer medium into the taken water, then adding a fluorine reagent and a lanthanum nitrate solution into the taken water, reacting fluorine ions with the fluorine reagent and the lanthanum nitrate under the action of the buffer medium to generate a blue ternary complex, wherein the color intensity is in direct proportion to the concentration of the fluorine ions, and the fluoride can be quantitatively determined at the wavelength of 620nm by using a spectrophotometer.
2. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: the stabilizer is a mixture of sodium chloride and glycerol, so that the reaction is carried out more stably, and the detection result is more accurate.
3. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: the preparation process of the phenol disulfonic acid comprises the following steps: weighing a certain amount of phenol, placing the phenol in a flask, adding a proper amount of concentrated sulfuric acid to dissolve the phenol, adding a proper amount of fuming sulfuric acid, fully mixing, and heating in boiling water for 2 hours to obtain a phenoldisulfonic acid solution.
4. The method for detecting the water quality of the household water purifier as recited in claim 3, wherein the method comprises the following steps: the phenoldisulfonic acid solution is a light brown thick liquid.
5. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: the preparation process of the aluminum hydroxide suspension comprises the following steps: dissolving a certain amount of aluminum potassium sulfate in water, heating to 60 ℃, then slowly adding a proper amount of concentrated ammonia water, standing for 1h, repeatedly washing precipitates by an inclined method, and finally adding a proper amount of pure water to obtain a suspension.
6. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: the buffer medium is an acetate solution of ph 4.1.
7. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: in the fluoride measurement, when the developed color is bluish during the measurement of the spectrophotometer, the light absorption value is lower at the moment, the deviation of the detection result is larger, the water to be taken is diluted, and the developed color is guaranteed to be pink or pink reddish.
8. The method for detecting the water quality of the household water purifier as recited in claim 1, wherein the method comprises the following steps: the spectrophotometer is a type 721 or type 722 spectrophotometer.
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