CN102937579A - Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof - Google Patents
Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof Download PDFInfo
- Publication number
- CN102937579A CN102937579A CN2012104269446A CN201210426944A CN102937579A CN 102937579 A CN102937579 A CN 102937579A CN 2012104269446 A CN2012104269446 A CN 2012104269446A CN 201210426944 A CN201210426944 A CN 201210426944A CN 102937579 A CN102937579 A CN 102937579A
- Authority
- CN
- China
- Prior art keywords
- free chlorine
- water quality
- tablet
- chlorine residual
- field evaluation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
Abstract
The invention discloses a rapid determination tablet for free chlorine residuals for water quality on the spot and a preparation method thereof. The tablet comprises, by mass, 1-5% of DPD, 1-2% of a masking agent, 15-20% of a disintegrating agent, 40-55% of a lubricant and 25-35% of a pH modifier. The tablet is small in specific surface area when contacted with the air, flat and smooth in surface, and attractive and glossy in appearance. According to the tablet, boric acid is used as the lubricant, moldability is good, disintegrated powder and fragments can be avoided, and oxidation of the DPD can be inhibited; and the tablet disintegrates in water within one minute and components which are not dissolved completely do not interfere the determination. A ternary buffer system composed of sodium bicarbonate, the boric acid and monopotassium phosphate accounts for more than 88% of the tablet formula, a large buffer capacity is provided, and the pH drinking water, purified water, natural drinking mineral water, domestic sewage and most industrial wastewater can be buffered.
Description
Technical field
The present invention relates to a kind of water quality free chlorine residual fast-field evaluation tablet and preparation method thereof.
Background technology
Free chlorine residual refers to water quality residual Cl in the water after chlorine-containing disinfectant sterilization
2, ClO
-, HClO general name, be the most general test index in the residual mensuration of water disinfection agent.The chlorine-containing disinfectant such as liquid chlorine and sodium hypochlorite is because of with low cost, and bactericidal effect is lasting, is still at home a class sanitizer of consumption maximum at present, is widely used in the sterilization of the water quality such as Drinking Water, industrial waste water, sanitary sewage, swimming-pool water.It is very necessary that free chlorine residue residual concentration in the water after disinfecting process and the sterilization is monitored.
The standard method of test of free chlorine residue has N among the GB5750.11-2006 " Drinking Water water examination method ", N-diethyl p-phenylenediamine (being called for short DPD) spectrophotometric method and tetramethyl benzidine colourimetry.Wherein the DPD method is soluble in water because of reagent, and is highly sensitive, and the range of linearity is wide and generally be used in the world.The colour developing principle of DPD method is: pH be 6.2～6.5 and the condition that exists of screening agent under, free chlorine residual directly and the DPD reagent colour development, the depth of color is directly proportional with the content of free chlorine residual.
The content of free chlorine residue is subjected to the impact of temperature, light intensity and various reductive agents and very unstable in the water, so, on-site sampling mensuration just to have authenticity.Operating process is loaded down with trivial details or need the laboratory determination method of large-scale analytical instrument all to be unfavorable for fast-field evaluation.Therefore, research and the commercialization of free chlorine residue field fast detection method will have larger realistic meaning in the water.
At present, water quality fast detecting product form is except sensor and test paper both at home and abroad, mainly also be based on DPD method principle and make DPD reagent, carry out visual colorimetric determination or carry out photoelectric colorimetric assay by portable tintmeter by colorimetric disc, colorimetric post, colorimetric card etc. after sample is developed the color.Because DPD solution is very easily oxidized, so DPD reagent generally exists with the form of solid reagent, comprises pulvis, tablet and ampoule bottle reagent.
Ampoule bottle reagent adopts vial nitrogen-filled seal packing, and the shelf-life can be for 10 years, but, cost of manufacture high at home not yet commercialization large because of technical difficulty.Pulvis generally prepares reagent rear direct employing packaging of aluminium foil bag, and manufacture craft is simple, domestic existing Related product.Patent CN 102128833 A disclose a kind of water quality chlorine residue test powder bag based on the DPD method, patent CN101241080A discloses a kind of portable colourimetry and color comparator thereof that detects polymorphic chlorine in the water, and it all is with quantitative package after the by a certain percentage solidification of agents useful for same in the GB GB5750.11-2006 method that the free chlorine residual of describing in these two patents is measured reagent.But because the specific surface area that pulvis contacts with air is large, the corner angle of crystalline particles easily pierce through packaging bag in the pulvis, and the sodium hydrogen phosphate in the national standard method (or dipotassium hydrogen phosphate) is the moisture absorption and shelf-life of causing pulvis long (the general import pulvis shelf-life is about 2 years, domestic pulvis is about 6 months～12 months) very easily.Tablet generally adopts the two aluminium foils of effervescent tablet to coat, and surfacing is difficult for piercing through aluminium foil, and the specific surface area of ingress of air is little, and the shelf-life of tablet is longer than pulvis in theory.But the easy oxidation deterioration that existing tablet has, some dissolution velocities too slow (being unsuitable for low temperature detects), some reagent blanks too high (being unsuitable for the detection of low concentration ozone) are therefore need a kind of good stability of exploitation, the reagent blank value is low, disintegration rate the is fast reagent that is used for measuring the water quality free chlorine residual.
Summary of the invention
The object of the present invention is to provide a kind of water quality free chlorine residual fast-field evaluation tablet and preparation method thereof.
The technical solution adopted in the present invention is:
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material is comprised of the component of following mass percent: DPD 1～5%, screening agent 1～2%, disintegrant 15～20%, lubricant 40～55%, pH adjusting agent 25～35%.
Preferably, DPD is soluble in water.
Preferably, DPD is N, N-diethyl-p-phenylenediamine sulfate, N, N-diethyl p-phenylenediamine hydrochloride, N, at least a in the N-diethyl p-phenylenediamine oxalates.
Preferably, screening agent is at least a in disodium ethylene diamine tetraacetate (EDTA-2Na), the tetrasodium ethylenediamine tetraacetate (EDTA-4Na).Preferably, screening agent is disodium ethylene diamine tetraacetate.
Preferably, disintegrant is sodium bicarbonate.
Preferably, lubricant is boric acid.
Preferably, pH adjusting agent potassium dihydrogen phosphate.
Preferably, the raw material of water quality free chlorine residual fast-field evaluation tablet is comprised of the component of following mass percent: DPD 2%, disodium ethylene diamine tetraacetate 2%, sodium bicarbonate 18%, boric acid 46%, potassium dihydrogen phosphate 32%.
The preparation method of above-mentioned water quality free chlorine residual fast-field evaluation tablet may further comprise the steps: with raw material drying to constant weight, be crushed to the water quality free chlorine residual fast-field evaluation tablet that 40～100 orders, mixing, dry powder sheeting obtain.
The invention has the beneficial effects as follows:
Water quality free chlorine residual fast-field evaluation tablet of the present invention, the specific surface area of ingress of air is little, surfacing is smooth, specious glossy, overcome that general pulvis easily pierces through aluminium foil bag, pulvis has fugacity after opening bag, powder easily sticking bag can't all be poured out and the easy oxidized shortcoming such as rotten of pulvis.
Water quality free chlorine residual fast-field evaluation tablet of the present invention adopts boric acid as lubricant, and good moldability is without flour and fragment, can suppress the oxidation of DPD, and boric acid does not disturb free chlorine residual to measure, and tablet of the present invention is disintegration in 1 minute in water, and not consoluet component is interference measurement not.The ternary buffer system that sodium bicarbonate, boric acid and potassium dihydrogen phosphate form in the tablet formulation of the present invention accounts for more than 88% of tablet formulation, has larger surge capability, the pH of available buffer Drinking Water, pure water, Drinking Mineral Water, sanitary sewage, most of industrial waste water.
Tablet of the present invention has stronger adaptability, and supporting visual colorimetric determination series products and portable tintmeter series products carry out the fast-field evaluation of free chlorine residual simultaneously.When using as visual colorimetric determination series products matched reagent, add 0.1g reagent in 5mL～50mL water sample, testing range is 0.05mg/L～5mg/L.During as portable tintmeter series products matched reagent, testing range is determined by the addition of institute's water sampling amount, reagent and the factor of colorimetric light path three aspects:.For example, the water sample amount is 10mL, add 0.1g reagent, when the colorimetric light path is 25mm, and testing range is 0.02mg/L～2.0mg/L, and the water sample amount is 5mL, add 0.2g reagent, when the colorimetric light path is 10mm, and testing range is 0.1mg/L～8.0mg/L.
Embodiment
The present invention is further illustrated below in conjunction with specific embodiment, but do not limit to so.
Embodiment 1
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl-p-phenylenediamine sulfate 2%, EDTA-2Na 2%, sodium bicarbonate 18%, boric acid 46%, potassium dihydrogen phosphate 32%.
Its preparation method may further comprise the steps: raw material is dried to respectively constant weight, is crushed to 40～100 orders, mix, get mixed-powder, mixed-powder carries out compressing tablet at sheeter, and every 0.1g carries out two aluminium foils with tablet and coats.
Embodiment 2
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl-p-phenylenediamine sulfate 1%, EDTA-2Na 1%, sodium bicarbonate 20%, boric acid 43%, potassium dihydrogen phosphate 35%.Its preparation method is with embodiment 1.
Embodiment 3
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl-p-phenylenediamine sulfate 3%, EDTA-2Na 2%, sodium bicarbonate 17%, boric acid 48%, potassium dihydrogen phosphate 30%.Its preparation method is with embodiment 1.
Embodiment 4
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl p-phenylenediamine oxalates 4%, EDTA-4Na 1%, sodium bicarbonate 16%, boric acid 51%, potassium dihydrogen phosphate 28%.Its preparation method is with embodiment 1.
Embodiment 5
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl p-phenylenediamine hydrochloride 5%, EDTA-2Na 1%, sodium bicarbonate 15%, boric acid 53%, potassium dihydrogen phosphate 26%.Its preparation method is with embodiment 1.
Embodiment 6
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl-p-phenylenediamine sulfate 3.5%, EDTA-2Na 1.5%, sodium bicarbonate 20%, boric acid 40%, potassium dihydrogen phosphate 35%.Its preparation method is with embodiment 1.
Embodiment 7
A kind of water quality free chlorine residual fast-field evaluation tablet, its raw material be by the component of following mass percent: N, N-diethyl p-phenylenediamine hydrochloride 3%, EDTA-2Na 1%, EDTA-2Na 1%, sodium bicarbonate 15%, boric acid 55%, potassium dihydrogen phosphate 25%.Its preparation method is with embodiment 1.
The impact that the prescription of different lubricants is measured the water quality free chlorine residual:
Under the process conditions identical with embodiment 1, adopt several tablet lubricants commonly used such as polyvinylpyrrolidone (PVP), boric acid, Sodium Benzoate, lauryl magnesium sulfate prepare water quality free chlorine residual fast-field evaluation tablet, more various lubricants are on the impact of tablet compressing tablet effect and reagent blank absorbance, each fills a prescription as shown in table 1, and testing result is as shown in table 2.
By table 1 and table 2 as can be known, adopt cementing agent PVP, Sodium Benzoate, lauryl magnesium sulfate all to have certain figuration effect as Comparative Examples 1～3 prescription of lubricant, but all there are a small amount of flour and fragment after the moulding, blank absorbency is high, and the PVP meeting is so that variable color namely occurs in manufacturing process tablet; And the tablet mouldability that the embodiment 1 that contains boric acid makes is very good, and blank absorbency is low, and tablet surface is smooth and glossy.Therefore, the boric acid that adds in the present invention's prescription plays an important role, and can guarantee the tablet good moldability, without flour and fragment, is best suited for free chlorine residual and measures reagent.
Be used for the stability of the different pulvis of water quality free chlorine residual Fast Measurement or tablet relatively:
Make DPD free chlorine residual test powder (called after: test powder 1) according to chlorine residue wp formula among the embodiment 1 of patent CN 102128833 A announcement, buy a certain import free chlorine residual test powder (called after: test powder 2), mixed-powder (called after: test powder 3) and the embodiment 1 that obtains in the preparation process in these two kinds test powder and the embodiment of the invention 1 finally prepared the tablet (called after: test pieces) carry out stable comparison that presses.
Concrete operations are as follows: each reagent room temperature in unpacked situation is placed naturally, whenever measure at regular intervals the reagent blank absorbance and (0.1g reagent is dissolved in the 10mL pure water, adopt the 1cm cuvette in 1 minute, take pure water as reference, measure absorbance at wavelength 510nm place).The result is as shown in table 3.
In the material security document that provides according to producer as can be known the principal ingredient of import test powder 2 be more or less the same with test powder 1, in test powder 2, contain a kind of carboxylate component of the unknown, all mainly formed by DPD salt, EDTA-2Na, sodium hydrogen phosphate and potassium dihydrogen phosphate.
As shown in Table 3, test powder 1 reagent blank absorbance sharply rises, and possible reason is: sodium hydrogen phosphate has larger hydroscopicity, has accelerated the oxidation of DPD salt; 2 variable colors of import reagent test powder are relatively slow, may have the function that suppresses the DPD oxidation by carboxylate wherein; Test powder 3 serious moisture absorption cakings, but variable color is still slow than test powder 1, be more or less the same with test powder 2, the sodium bicarbonate in this patent prescription and potassium dihydrogen phosphate are exposed to can react gradually in the air and generate chlorine dioxide and water, illustrate that the boric acid in this reagent has the effect that suppresses the DPD oxidation; Test pieces rises slower than test powder 3 reagent blank absorbances, illustrate that test pieces is little because of the specific surface area of ingress of air, has better stability than pulvis.
Be used for the comparison of the different pulvis of water quality free chlorine residual Fast Measurement or tablet test effect:
Adopt the liquor natrii hypochloritis to make 3 free chlorine residual sample solutions of variable concentrations, three kinds of reagent are used for the test of free chlorine residual: 0.1g reagent is dissolved in 10mL sample liquid, adopt the 1cm cuvette in 1 minute, take pure water as reference, measure absorbance at wavelength 510nm place.The reagent that adopts is above-mentioned test powder 2 by the standby test powder 1 of patent system, import and the test pieces of the embodiment of the invention 1, and same concentration sample liquid detects respectively result such as table 4 with different test agents.
As shown in Table 4, test powder 1 colour developing absorbance is higher, and 2 pairs of same free chlorine residual sample liquid colour developing dulling luminosity ratios of water quality free chlorine residual fast-field evaluation tablet of the present invention and import pulvis test powder are more consistent.
Claims (10)
1. water quality free chlorine residual fast-field evaluation tablet, its raw material is comprised of the component of following mass percent: DPD 1～5%, screening agent 1～2%, disintegrant 15～20%, lubricant 40～55%, pH adjusting agent 25～35%.
2. water quality free chlorine residual fast-field evaluation tablet according to claim 1, it is characterized in that: DPD is soluble in water.
3. water quality free chlorine residual fast-field evaluation tablet according to claim 2, it is characterized in that: DPD is N, N-diethyl-p-phenylenediamine sulfate, N, N-diethyl p-phenylenediamine hydrochloride, N, at least a in the N-diethyl p-phenylenediamine oxalates.
4. water quality free chlorine residual fast-field evaluation tablet according to claim 1 is characterized in that: screening agent is at least a in disodium ethylene diamine tetraacetate, the tetrasodium ethylenediamine tetraacetate.
5. water quality free chlorine residual fast-field evaluation tablet according to claim 4, it is characterized in that: screening agent is disodium ethylene diamine tetraacetate.
6. water quality free chlorine residual fast-field evaluation tablet according to claim 1, it is characterized in that: disintegrant is sodium bicarbonate.
7. water quality free chlorine residual fast-field evaluation tablet according to claim 1, it is characterized in that: lubricant is boric acid.
8. water quality free chlorine residual fast-field evaluation tablet according to claim 1 is characterized in that: the pH adjusting agent potassium dihydrogen phosphate.
9. each described water quality free chlorine residual fast-field evaluation tablet according to claim 1～8, it is characterized in that: the raw material of this reagent is comprised of the component of following mass percent: DPD 2%, disodium ethylene diamine tetraacetate 2%, sodium bicarbonate 18%, boric acid 46%, potassium dihydrogen phosphate 32%.
10. the preparation method of water quality free chlorine residual fast-field evaluation tablet claimed in claim 1 may further comprise the steps: with raw material drying to constant weight, be crushed to the water quality free chlorine residual fast-field evaluation tablet that 40～100 orders, mixing, dry powder sheeting obtain.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426944.6A CN102937579B (en) | 2012-10-31 | 2012-10-31 | Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210426944.6A CN102937579B (en) | 2012-10-31 | 2012-10-31 | Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102937579A true CN102937579A (en) | 2013-02-20 |
| CN102937579B CN102937579B (en) | 2014-08-27 |
Family
ID=47696490
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210426944.6A Active CN102937579B (en) | 2012-10-31 | 2012-10-31 | Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102937579B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782723A (en) * | 2017-09-28 | 2018-03-09 | 蒋成量 | A kind of preparation method of ClO 2 solution Concentration Testing test paper |
| CN110057813A (en) * | 2019-04-25 | 2019-07-26 | 沈阳溢源生物科技有限公司 | The colour developing agent prescription and preparation method of instant capacity colorimetric method for determining available chlorine content |
| CN114460070A (en) * | 2021-12-31 | 2022-05-10 | 桂林优利特医疗电子有限公司 | Preparation method and application of test paper for detecting residual chlorine and total chlorine in water |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12064758B2 (en) | 2021-08-20 | 2024-08-20 | Watts Regulator Co. | Stabilized reagent compositions, systems and methods using the same |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000111541A (en) * | 1998-10-01 | 2000-04-21 | Riken Keiki Co Ltd | Sheet for detecting oxidizing gas |
| CN2482081Y (en) * | 2001-03-23 | 2002-03-13 | 广东省微生物研究所 | Total chlorine, residual chlorine and ozone quick measuring reagent box for water |
| JP2004085453A (en) * | 2002-08-28 | 2004-03-18 | Shinfuji Kaseiyaku Kk | Solid residual chlorine measuring reagent |
| JP2006029875A (en) * | 2004-07-13 | 2006-02-02 | Ebara Corp | Detection reagent of residual chlorine and detection method using it |
| CN101241080A (en) * | 2008-01-25 | 2008-08-13 | 黄晓平 | Convenient colorimetric technique for detecting subaqueous polymorphic chlorine and its color comparator |
| JP2008233108A (en) * | 2008-06-16 | 2008-10-02 | Shinfuji Kaseiyaku Kk | Reagent for free residual chlorine measurement |
| JP2011043482A (en) * | 2009-08-24 | 2011-03-03 | Nippon Soda Co Ltd | Residual chlorine measuring reagent |
| CN102072901A (en) * | 2010-10-22 | 2011-05-25 | 杭州天迈生物科技有限公司 | Quick detection troche for sulfite in food |
| CN102128833A (en) * | 2010-12-31 | 2011-07-20 | 杨海宁 | Reagent kit for detecting residual chlorine in water |
| WO2011100789A1 (en) * | 2010-02-18 | 2011-08-25 | Aqualysis Pty Ltd | Reagent for analysis |
-
2012
- 2012-10-31 CN CN201210426944.6A patent/CN102937579B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000111541A (en) * | 1998-10-01 | 2000-04-21 | Riken Keiki Co Ltd | Sheet for detecting oxidizing gas |
| CN2482081Y (en) * | 2001-03-23 | 2002-03-13 | 广东省微生物研究所 | Total chlorine, residual chlorine and ozone quick measuring reagent box for water |
| JP2004085453A (en) * | 2002-08-28 | 2004-03-18 | Shinfuji Kaseiyaku Kk | Solid residual chlorine measuring reagent |
| JP2006029875A (en) * | 2004-07-13 | 2006-02-02 | Ebara Corp | Detection reagent of residual chlorine and detection method using it |
| CN101241080A (en) * | 2008-01-25 | 2008-08-13 | 黄晓平 | Convenient colorimetric technique for detecting subaqueous polymorphic chlorine and its color comparator |
| JP2008233108A (en) * | 2008-06-16 | 2008-10-02 | Shinfuji Kaseiyaku Kk | Reagent for free residual chlorine measurement |
| JP2011043482A (en) * | 2009-08-24 | 2011-03-03 | Nippon Soda Co Ltd | Residual chlorine measuring reagent |
| WO2011100789A1 (en) * | 2010-02-18 | 2011-08-25 | Aqualysis Pty Ltd | Reagent for analysis |
| CN102072901A (en) * | 2010-10-22 | 2011-05-25 | 杭州天迈生物科技有限公司 | Quick detection troche for sulfite in food |
| CN102128833A (en) * | 2010-12-31 | 2011-07-20 | 杨海宁 | Reagent kit for detecting residual chlorine in water |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107782723A (en) * | 2017-09-28 | 2018-03-09 | 蒋成量 | A kind of preparation method of ClO 2 solution Concentration Testing test paper |
| CN110057813A (en) * | 2019-04-25 | 2019-07-26 | 沈阳溢源生物科技有限公司 | The colour developing agent prescription and preparation method of instant capacity colorimetric method for determining available chlorine content |
| CN114460070A (en) * | 2021-12-31 | 2022-05-10 | 桂林优利特医疗电子有限公司 | Preparation method and application of test paper for detecting residual chlorine and total chlorine in water |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102937579B (en) | 2014-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102937579B (en) | Rapid determination tablet for free chlorine residuals for water quality on the spot and preparation method thereof | |
| CN102128833A (en) | Reagent kit for detecting residual chlorine in water | |
| CN109612951A (en) | For detecting chlorine residue in water/total chlorine detection agent and preparation method thereof and detection method | |
| CN103868917A (en) | Powder oxygen indicator and preparation method thereof | |
| CN2482081Y (en) | Total chlorine, residual chlorine and ozone quick measuring reagent box for water | |
| CN104330367B (en) | Rapid detection agent for nitrate | |
| CN109406425A (en) | For detecting detection agent of chlorine dioxide and preparation method thereof and detection method in water | |
| CN101324568A (en) | Glutamic acid diagnosis/determination reagent kit and method for determining aminoglutaric acid concentration | |
| CN102928358B (en) | Water quality ozone field rapid determination tablet and preparation method thereof | |
| CN104406965A (en) | Kit for quickly detecting residual chlorine in water sample and use method of kit | |
| Medina et al. | A rapid and selective solid-phase UV spectrophotometric method for determination of ascorbic acid in pharmaceutical preparations and urine | |
| CN105866110A (en) | Detection agent for determining content of silica in water | |
| Kumar et al. | Spectrophotometric Determination of Fexofenadine Hydrochloride. | |
| CN107340248A (en) | The quick determination method of anthocyanidin in ferment product | |
| CN201955298U (en) | Pocket chlorine dioxide colorimeter | |
| CN105506061A (en) | Kit and method for detecting activity of sucrose phosphate synthase | |
| Xin et al. | Highly selective spectrophotometric determination of chlorine dioxide in water using Rhodamine B | |
| CN100523791C (en) | Test paper for detecting disinfector of chlorine dioxide, and preparation method | |
| CN113155818B (en) | Reagent for rapidly and quantitatively detecting cyanide, preparation method and detection method thereof | |
| JP2004518113A (en) | Method and agent for determining the total hardness of water | |
| Gherman et al. | Development and validation of UV spectrophotometric method for determination of enalapril maleate from commercial dosage forms | |
| CN104515772B (en) | The kit and detection method of cyanide in a kind of quick measure water | |
| CN110455792A (en) | Basicity concentration quick detection reagent and its detection method in a kind of water | |
| Jagathi et al. | Spectrophotometric determination of memantine in bulk and in pharmaceutical formulations | |
| CN104792774A (en) | Kit and method for measuring copper ion concentration of water |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |