GB813493A - Improvements relating to the testing of water for free and combined chlorine - Google Patents
Improvements relating to the testing of water for free and combined chlorineInfo
- Publication number
- GB813493A GB813493A GB3635356A GB3635356A GB813493A GB 813493 A GB813493 A GB 813493A GB 3635356 A GB3635356 A GB 3635356A GB 3635356 A GB3635356 A GB 3635356A GB 813493 A GB813493 A GB 813493A
- Authority
- GB
- United Kingdom
- Prior art keywords
- combined chlorine
- free
- water
- testing
- chlorine
- 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.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/18—Water
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Abstract
The free and combined chlorine content of water is determined by adding a small amount of a di-alkyl p-phenylene diamine or a salt thereof, as indicator and a sequestering agent which may be sodium hexametaphosphate or ethylene diamine tetra-acetic acid. The presence of chlorine is indicated by a red coloration, and may be estimated colorimetrically or by titrating with a reducing agent, e.g. ferrous ammonium sulphate solution. Preferably the pH value is maintained between 5.8 and 7.5, and a buffer, e.g. sodium di-hydrogen phosphate, is present. The oxalates, sulphates and hydrochlorides of di-ethyl and di-methyl p-phenylene diamine are specified. Combined chlorine in the form of dichloramine and nitrogen chloride may be individually estimated. The indicator composition may be made up in the form of tablets.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB813493A true GB813493A (en) | 1959-05-21 |
Family
ID=1744551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3635356A Expired GB813493A (en) | 1956-11-28 | Improvements relating to the testing of water for free and combined chlorine |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB813493A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5362650A (en) * | 1993-10-04 | 1994-11-08 | Hach Company | Ultra-low range chlorine determination |
| US6355489B1 (en) | 1997-03-21 | 2002-03-12 | Diacron S.R.L. | Method for the determination of oxygen-centered free radicals |
| CN113655169A (en) * | 2021-08-23 | 2021-11-16 | 斯瑞尔环境科技股份有限公司 | Method for detecting nitrogen trichloride in ferric salt |
-
1956
- 1956-11-28 GB GB3635356A patent/GB813493A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5362650A (en) * | 1993-10-04 | 1994-11-08 | Hach Company | Ultra-low range chlorine determination |
| US6355489B1 (en) | 1997-03-21 | 2002-03-12 | Diacron S.R.L. | Method for the determination of oxygen-centered free radicals |
| CN113655169A (en) * | 2021-08-23 | 2021-11-16 | 斯瑞尔环境科技股份有限公司 | Method for detecting nitrogen trichloride in ferric salt |
| CN113655169B (en) * | 2021-08-23 | 2023-12-08 | 斯瑞尔环境科技股份有限公司 | Method for detecting nitrogen trichloride in ferric salt |
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