CN104237229B - PH value test fluid and preparation method thereof - Google Patents
PH value test fluid and preparation method thereof Download PDFInfo
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- CN104237229B CN104237229B CN201410416165.7A CN201410416165A CN104237229B CN 104237229 B CN104237229 B CN 104237229B CN 201410416165 A CN201410416165 A CN 201410416165A CN 104237229 B CN104237229 B CN 104237229B
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- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 239000012530 fluid Substances 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 239000002562 thickening agent Substances 0.000 claims abstract description 15
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 13
- 239000003960 organic solvent Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- KVYRCBOUKXJXDK-UHFFFAOYSA-N 3,4-dimethylphenazine-1,2-diamine hydrochloride Chemical compound Cl.C1=CC=CC2=NC3=C(C)C(C)=C(N)C(N)=C3N=C21 KVYRCBOUKXJXDK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000012153 distilled water Substances 0.000 claims abstract description 8
- XJRPTMORGOIMMI-UHFFFAOYSA-N ethyl 2-amino-4-(trifluoromethyl)-1,3-thiazole-5-carboxylate Chemical compound CCOC(=O)C=1SC(N)=NC=1C(F)(F)F XJRPTMORGOIMMI-UHFFFAOYSA-N 0.000 claims abstract description 8
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229960000907 methylthioninium chloride Drugs 0.000 claims abstract description 6
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 12
- 235000006708 antioxidants Nutrition 0.000 claims description 12
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 9
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 8
- 239000000725 suspension Substances 0.000 claims description 8
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 claims description 6
- 239000002904 solvent Substances 0.000 claims description 6
- 229920001661 Chitosan Polymers 0.000 claims description 4
- 108010010803 Gelatin Proteins 0.000 claims description 4
- 239000000783 alginic acid Substances 0.000 claims description 4
- 235000010443 alginic acid Nutrition 0.000 claims description 4
- 229920000615 alginic acid Polymers 0.000 claims description 4
- 229960001126 alginic acid Drugs 0.000 claims description 4
- 150000004781 alginic acids Chemical class 0.000 claims description 4
- 229920000159 gelatin Polymers 0.000 claims description 4
- 239000008273 gelatin Substances 0.000 claims description 4
- 235000019322 gelatine Nutrition 0.000 claims description 4
- 235000011852 gelatine desserts Nutrition 0.000 claims description 4
- 239000001814 pectin Substances 0.000 claims description 4
- 235000010987 pectin Nutrition 0.000 claims description 4
- 229920001277 pectin Polymers 0.000 claims description 4
- 239000004255 Butylated hydroxyanisole Substances 0.000 claims description 3
- 235000010323 ascorbic acid Nutrition 0.000 claims description 3
- 229960005070 ascorbic acid Drugs 0.000 claims description 3
- 239000011668 ascorbic acid Substances 0.000 claims description 3
- 235000019282 butylated hydroxyanisole Nutrition 0.000 claims description 3
- CZBZUDVBLSSABA-UHFFFAOYSA-N butylated hydroxyanisole Chemical compound COC1=CC=C(O)C(C(C)(C)C)=C1.COC1=CC=C(O)C=C1C(C)(C)C CZBZUDVBLSSABA-UHFFFAOYSA-N 0.000 claims description 3
- 229940043253 butylated hydroxyanisole Drugs 0.000 claims description 3
- 230000006866 deterioration Effects 0.000 claims description 3
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- AKHNMLFCWUSKQB-UHFFFAOYSA-L sodium thiosulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=S AKHNMLFCWUSKQB-UHFFFAOYSA-L 0.000 claims description 3
- 235000019345 sodium thiosulphate Nutrition 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 229940001474 sodium thiosulfate Drugs 0.000 claims description 2
- 239000003814 drug Substances 0.000 abstract description 20
- 230000008859 change Effects 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000001514 detection method Methods 0.000 abstract description 2
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 235000013305 food Nutrition 0.000 abstract description 2
- 238000007689 inspection Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 20
- 239000007788 liquid Substances 0.000 description 14
- 239000003153 chemical reaction reagent Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 239000012085 test solution Substances 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 238000009472 formulation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000004570 mortar (masonry) Substances 0.000 description 2
- 239000012086 standard solution Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- ZPLCXHWYPWVJDL-UHFFFAOYSA-N 4-[(4-hydroxyphenyl)methyl]-1,3-oxazolidin-2-one Chemical compound C1=CC(O)=CC=C1CC1NC(=O)OC1 ZPLCXHWYPWVJDL-UHFFFAOYSA-N 0.000 description 1
- 206010021703 Indifference Diseases 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000011013 aquamarine Substances 0.000 description 1
- 239000008365 aqueous carrier Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- UDSAIICHUKSCKT-UHFFFAOYSA-N bromophenol blue Chemical compound C1=C(Br)C(O)=C(Br)C=C1C1(C=2C=C(Br)C(O)=C(Br)C=2)C2=CC=CC=C2S(=O)(=O)O1 UDSAIICHUKSCKT-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- MCPLVIGCWWTHFH-UHFFFAOYSA-L methyl blue Chemical compound [Na+].[Na+].C1=CC(S(=O)(=O)[O-])=CC=C1NC1=CC=C(C(=C2C=CC(C=C2)=[NH+]C=2C=CC(=CC=2)S([O-])(=O)=O)C=2C=CC(NC=3C=CC(=CC=3)S([O-])(=O)=O)=CC=2)C=C1 MCPLVIGCWWTHFH-UHFFFAOYSA-L 0.000 description 1
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 1
- 239000012046 mixed solvent Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000546 pharmaceutical excipient Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
The invention discloses pH value test fluid that a kind of scope of testing is 4.6 7.6 and preparation method thereof, and provide a kind of convenient test, colour developing is rapid, and good stability is difficult to test fluid and the preparation method spilt.This test fluid consisting of according to percentage by weight: organic solvent 50～60%, thickening agent 0.5～3%, antioxidant 0.5～1%, ethyoxyl Huang rebukes essence 1～2%, Herba Cladoniae rangiferinae 2～3%, bromocresol purple 0.5～1%, dimethyl diaminophenazine chloride 0.5～1%, methylene blue 0.2～0.5%, the distilled water of surplus.This test fluid can be observed visually the graded of colour developing medicament color when pH value differs 0.2 precision change; convenient test; colour developing is rapidly; good stability; it is difficult to spill; quick inspection that is cheap, that be suitable in laboratory this pH value excursion external, can be used for food safety, medicine detection, environmental conservation, monitoring water quality, commercial production, criminal tests etc. needs the most accurately to test outside laboratory the field of the pH value of solution to be measured.
Description
Technical field
The present invention relates to chemical analysis technology field, particularly relate to the pH that a kind of scope of testing is 4.6-7.6
Value test fluid and preparation method thereof.
Background technology
That the pH value of solution represents is H in solution+And OH-The concentration of ion, is abbreviated as pH value, is to weigh
The quantitative index of solution soda acid degree, it is defined as H in solution+The negative logarithm of concentration.PH value more low in acidity is more
By force, pH value more high alkalinity is the strongest.The pH value of solution is a most basic index in analytical chemistry, often needs
Measure.By the definition of pH value it is recognised that pH value is the yardstick weighing solution acid-basicity, at a lot of aspects
Needing to control the Acidity of Aikalinity of solution, therefore, accurately and easily testing of pH value is significant.
The method of testing of pH value mainly has three kinds: the first is the reagent paper of the pH using various precision, the second
Being to use portable and desk-top pH pen, the third is to use pH test fluid.
The reagent paper of pH value: at present, the method for the outer easy pH value determination of laboratory mostly use pH value reagent paper with
And pH value precision test paper, convenient and swift, cheap, easy to carry, not by using environment to be affected, no
Affected by user knowledge expertise.Reagent paper is used can quickly to test out the Acidity of Aikalinity of testing liquid.Its
Production method is according to proper proportion wiring solution-forming by multiple pH value colour developing medicament, is then immersed by filter paper,
Solvent volatilizes and gets product, and paper slip immerses during use in testing liquid the change according to color and colorimetric card ratio
To obtaining liquid pH value numerical value about.Owing to the colorimetric of reagent paper pH value is to carry out on paper carrier, and
The aqueous carrier of original solution is entirely different, so colorimetric is difficult to observe, and also due to testing liquid on reagent paper
Amount of liquid relatively fewer, typically less than one, so can not ignore colour developing medicament inherently Acidity of Aikalinity pair
The impact of testing liquid Acidity of Aikalinity, so testing result is affected bigger by colour developing medicament itself.So reagent paper
There is the feature being difficult to observe, precision is not enough in method, to some require the place of pH value precision unsuitable for.
Portable and desk-top pH pen: portable pH value pen may be used for quickly detecting outside laboratory, reliable results,
At the proper use of lower pH value that can read solution accurately.But pH pen has electronic equipment generally to exist
Problem, as high temperature, high humidity environment are not suitable for using, sensor, the design rationality of circuit directly affect instrument
The precision of device and repeatability, instrument need irregular to carry out correcting, also there are certain requirements the keeping of instrument.
Test fluid, test paper relatively compares, and response time is relatively slow, and overall operation is cumbersome, expensive.
The use of portable pH pen also has certain requirement to user, testing liquid to be stirred continuously, and not
Can there is air bubble etc. inside and outside sensor probe, these are for the user entirely without chemistry experience
For, the most more difficulty.
PH test fluid: at present, the correlative measurement test solution that market can have been bought is divided into the single colour developing medicament of use to join
The test fluid put and the test fluid of use multiple colour developing medicament configuration.Survey with the configuration of single colour developing medicament
Test solution, such as pH value 3.0～4.5 test fluid, uses bromophenol blue as colour developing medicament；PH value 4.0～5.6 is surveyed
Test solution, uses coeruleum bromocresolis as colour developing medicament；PH value 6.0～7.6 test fluid, uses bromothymol blue
As colour developing medicament etc..Owing to color range is too narrow, pH value has exceeded measurement range and all cannot measure, and limits
Its application, there is also color simultaneously and is difficult to observe, poor stability and the problem easily spilt.It addition, it is multiple
The test fluid of the colour developing medicament configuration of component, pH value 4～10 test fluid as seen from market, its formula is not quite clear,
In use, this test fluid color developing effect in different purchase sources is roughly the same, and only medicinal liquid is dense
The difference of degree.When measuring solution ph to be measured, naked eyes the most inadequate it is observed that pH is in 0.5 precision
The color change of Shi Yinqi colour developing medicament, some colour developing interval is observed under pH1.0 precision the most reluctantly；
The solvent system water of the test fluid of the colour developing medicament configuration of various ingredients and the mixed solvent of ethanol, due to ethanol
Volatile characteristic causes it to gradually decrease at storage process volume, therefore can find solution after using some months
Reduce, and, produce solute and separate out and the phenomenon of oxidation deterioration, meanwhile, in transfer transportation also
Have and spill than more serious.
Summary of the invention
It is an object of the invention to for technological deficiency present in prior art, and provide a kind of 4.6～7.6
Test in the range of show the high accuracy pH test fluid of different colours.
It is a further object to provide and a kind of test scope high precision measurement in the range of 4.6～7.6
The preparation method of liquid.
Be the technical scheme is that by realizing the purpose of the present invention
A kind of scope of testing is the pH value test fluid of 4.6-7.6, consisting of according to percentage by weight: organic
Solvent 50～60%, thickening agent 0.5～3%, antioxidant 0.5～1%, ethyoxyl Huang rebuke essence 1～2%, Herba Cladoniae rangiferinae 2～
3%, bromocresol purple 0.5～1%, dimethyl diaminophenazine chloride 0.5～1%, methylene blue 0.2～0.5%, the distilled water of surplus；
Described organic solvent is the solvent with the characteristic increasing developer dissolubility, and described antioxidant prevents for having
The material of developer oxidation deterioration, described thickening agent is the inert substance having and increasing test fluid viscosity.
Described organic solvent is at least one in acetone, ethylene glycol and propylene glycol.
Described antioxidant is at least one in ascorbic acid, sodium thiosulfate and Butylated hydroxyanisole.
Described thickening agent is at least one in pectin, alginic acid, chitosan or gelatin.
The preparation method of a kind of pH value test fluid, comprises the steps:
(1) organic solvent, thickening agent are become suspension solution with antioxidant heating for dissolving；
(2) ethyoxyl Huang is rebuked essence, Herba Cladoniae rangiferinae, bromocresol purple, dimethyl diaminophenazine chloride and methylene blue and join step (1)
In the suspension solution of gained, grind, to be dissolved completely after supply with distilled water enough.
Compared with prior art, the invention has the beneficial effects as follows:
1. the test fluid of the present invention is determined by the proportioning of different colour developing medicament so that test fluid is at pH value
Present the color gradient change that naked eyes can be distinguished in the range of 4.6～7.6, reach the needs of high precision measurement, permissible
Distinguishing pH value by naked eyes causes the color gradient of colour developing medicament to change under 0.2 precision, is adapted to pH value
The place that precision is high, promotes the dissolving of developer simultaneously by adding organic solvent, by adding antioxidant solution
Determine problem oxidizable, volatile, solved, by adding thickening agent, the problem easily spilt.By adding
The antioxidant of rational proportion, thickening agent and organic solvent, synergism so that product stability is high, storage
Time is long, the most volatile, will not spill in transportation, beneficially the commercialization of product.
2. the present invention selectes pectin, alginic acid, chitosan, gelatin as thickening agent, and thickening effect is obvious,
Consumption is low, strong with solvent affinity, can well prevent the volatilization of organic solvent in test fluid and transport
Journey spills problem.
3, the test fluid obtained due to the present invention is true solution, and all the components is all fully dissolved in solvent,
Can develop the color at once when the medicament that develops the color contacts with solution to be measured, colour developing is rapidly.
4, the test fluid of the present invention is easy to use.
5, the preparation method of the pH value that the present invention obtains high precision measurement liquid in the range of 4.6～7.6, first
By organic solvent, antioxidant, thickening agent by being prepared as suspension solution, make thickening agent the most swelling, favorably
In its rapid solution.This preparation method is simple, quickly, it is not necessary to special instrument and equipment, to producers also
Without particular/special requirement, to production environment without specific condition.
Accompanying drawing explanation
Fig. 1 is the pH value test fluid of present invention color developing effect result of the test figure in the range of pH value 4.6～7.6.
Detailed description of the invention
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment 1
Taking 50 grams of propylene glycol, add 1 gram of pectin, add 0.5 gram of ascorbic acid, heated and stirred makes suspendible
Liquid.Ethyoxyl Huang is rebuked essence 2 grams, Herba Cladoniae rangiferinae 3 grams, bromocresol purple 1 gram, dimethyl diaminophenazine chloride 1 gram, methylene again
Blue 0.5 gram enters in above-mentioned suspension with mortar grinder, supplies distilled water to 100 grams after stirring and dissolving is complete,
Get product.Through accelerated tests such as high temperature, high humidity, illumination, result shows that this formulation stability is splendid,
Meet commercial requirements.
Embodiment 2
Taking 60 grams of acetone, add 3 grams of chitosans, add 1 gram of sodium thiosulfate, heated and stirred makes suspendible
Liquid.Ethyoxyl Huang is rebuked essence 1 gram, Herba Cladoniae rangiferinae 2 grams, bromocresol purple 0.5 gram, dimethyl diaminophenazine chloride 0.5 gram, Asia again
Methyl blue 0.2 gram adds in above-mentioned suspension with mortar grinder, supplies distilled water to 100 after stirring and dissolving is complete
Gram, get product.Through accelerated tests such as high temperature, high humidity, illumination, result shows this formulation stability pole
Good, meet commercial requirements.
Embodiment 3
Take 300 grams of ethylene glycol, 300 grams of propylene glycol, add 5 grams of alginic acid, 20 grams of gelatin, add sulfur generation
5 grams of sodium sulfate, Butylated hydroxyanisole 5 grams, heated and stirred makes suspension.Again ethyoxyl Huang is rebuked essence
20 grams, Herba Cladoniae rangiferinae 30 grams, bromocresol purple 5 grams, dimethyl diaminophenazine chloride 5 grams, methylene blue 2 grams, add above-mentioned suspendible
Liquid uses small-sized homogenizer machine grind, after stirring and dissolving is complete, supply distilled water to 1000 grams, after subpackage,
Get product.Through accelerated tests such as high temperature, high humidity, illumination, result shows that this formulation stability is splendid,
Meet commercial requirements.
Using effect is tested:
Experiment 1
Colour test:
Agents useful for same: in the range of pH value 4.6～7.6, the standard solution of pH difference 0.2；
Use the color developing effect test of test fluid: the above-mentioned standard solution 2.5ml taking different pH value respectively (uses
PH value meter calibrating), drip the test fluid in an embodiment of the present invention 1 or 2 or 3.Its color developing effect is almost
Unanimously, as shown in Figure 1, figure marks out on glass cuvette the pH value of corresponding solution with black marking pen.pH
Value 4.6 be redness, and pH value 6.0 is yellow, gradually weakens for redness, yellow between pH value 4.6-6.0
In various degree orange gradually strengthened, pH value 6.2 sports yellowish-brown, and pH value 6.4 is rufous, pH
Value 6.6 is fruit green, and pH value 7.6 is bluish violet, and the medium aquamarine at pH value 6.6-7.6 gradually weakens, purple
The aeruginous in various degree that color gradually strengthens.
Experiment 2
Stability test: according to Pharmacopoeia of People's Republic of China (2010 editions) appended claims, the present invention is real
The test fluid executing example 1-embodiment 3 is respectively put in airtight transparent plastic bottle, leaves 60 degrees Celsius respectively in,
Humidity 95%, lower 10 days of illumination 4500 lux environment, observe test fluid stability, be not any change, with
Time according to testing 1 operational approach, different pH value is developed the color, develop the color indifference.
Experiment 3
Prevent spilling test: the test fluid of embodiment of the present invention 1-embodiment 3 is respectively put into 15ml medicament for the eyes water droplet
In Ping, it is inverted with finger flicking bottle, finds that test fluid is difficult to flow out；Will be equipped with the drop bottle of test fluid again,
Put in tablet friability instrument and rotate 10 minutes, also without spilling phenomenon.Under same test condition, if not
Adding thickening agent, Seepage all can occur, the two forms sharp contrast.
What the present invention obtained is a kind of pH value high precision measurement liquid in the range of 4.6～7.6, convenient test,
Colour developing is rapid, and good stability is difficult to spill, cheap.Normal human eye can easily pick out pH
It is worth the graded of colour developing medicament color when 0.2 precision change, by adding pharmaceutic adjuvant, improves survey
The steady dissolution of test solution, antioxidant capacity and viscosity, to improve its stability, easily oxidizable and easily to spill
Deficiency.The quick inspection being suitable in laboratory this pH value excursion external, can be used for food safety,
Medicine detection, environmental conservation, monitoring water quality, commercial production, criminal tests etc. need outside laboratory the most smart
Really test the field of the pH value of solution to be measured.
The above is only the preferred embodiment of the present invention, it is noted that for the art
For those of ordinary skill, under the premise without departing from the principles of the invention, it is also possible to make some improvement and profit
Decorations, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (2)
1. the scope of testing is the pH value test fluid of 4.6-7.6, it is characterised in that according to weight percent
Consisting of of ratio: organic solvent 50～60%, thickening agent 0.5～3%, antioxidant 0.5～1%, ethyoxyl is yellow
Rebuke essence 1～2%, Herba Cladoniae rangiferinae 2～3%, bromocresol purple 0.5～1%, dimethyl diaminophenazine chloride 0.5～1%, methylene blue 0.2～
0.5%, the distilled water of surplus；Described organic solvent is the solvent with the characteristic increasing developer dissolubility,
Described antioxidant is the material having and preventing developer oxidation deterioration, and described thickening agent is for having increase test fluid
The inert substance of viscosity；Described organic solvent is at least one in acetone, ethylene glycol and propylene glycol；Institute
Stating antioxidant is at least one in ascorbic acid, sodium thiosulfate and Butylated hydroxyanisole；Described thickening
Agent is at least one in pectin, alginic acid, chitosan or gelatin.
2. the preparation method of the pH value test fluid described in a claim 1, it is characterised in that under including
State step:
(1) organic solvent, thickening agent and antioxidant heated and stirred are made suspension solution；
(2) ethyoxyl Huang is rebuked essence, Herba Cladoniae rangiferinae, bromocresol purple, dimethyl diaminophenazine chloride and methylene blue and join step (1)
In the suspension solution of gained, grind, to be dissolved completely after supply with distilled water enough.
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| CN111812086A (en) * | 2020-08-04 | 2020-10-23 | 河南省产品质量监督检验院 | Trisodium trithiocyanate rapid detection test paper and preparation method and detection method thereof |
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| CN201016931Y (en) * | 2006-12-06 | 2008-02-06 | 白莉 | pH color matching detecting tube |
| US7883898B2 (en) * | 2007-05-07 | 2011-02-08 | General Electric Company | Method and apparatus for measuring pH of low alkalinity solutions |
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