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Determination of Impurities in Liquid Chlorine
The U.S. Public Health Service (USPHS) is sponsoring a research program to investigate methods now used for liquid chlorine analysis and to develop new or improved methods where feasible. At the 1959 AWWA Conference in San Francisco, several analytic methods were discussed, and it became evident that some methods needed further study. For example, the pyridine method for chloroform determination is not specific; other chlorinated hydrocarbons are also measured by it. The chromic acid method to determine hydrochloric acid is troublesome, and it is planned to study the method more intensively. Also studied in 1959 was a method for assaying chlorine, whereby residual gas volumes were measured in a gas buret after the chlorine had reacted with mercury. This method seems to be satisfactory. The determination of iron chloride in residues obtained by evaporation of a sample of chlorine is readily done colorimetrically, the color being developed with orthophenanthroline in a buffered solution after the iron has been reduced with hydroxylamine. This method is very satisfactory for iron. In 1959, an evaluation was made of a method already used by some laboratories for determining nitrogen trichloride. With this method, the trichloride was allowed to react with concentrated hydrochloric acid to form ammonium chloride and chlorine. The ammonia was then determined by the kjeldahl method when present in small amounts, or colorimetrically by the nessler method when present in lesser concentrations. Reproducible results were readily obtained.
Determination of Impurities in Liquid Chlorine
The U.S. Public Health Service (USPHS) is sponsoring a research program to investigate methods now used for liquid chlorine analysis and to develop new or improved methods where feasible. At the 1959 AWWA Conference in San Francisco, several analytic methods were discussed, and it became evident that some methods needed further study. For example, the pyridine method for chloroform determination is not specific; other chlorinated hydrocarbons are also measured by it. The chromic acid method to determine hydrochloric acid is troublesome, and it is planned to study the method more intensively. Also studied in 1959 was a method for assaying chlorine, whereby residual gas volumes were measured in a gas buret after the chlorine had reacted with mercury. This method seems to be satisfactory. The determination of iron chloride in residues obtained by evaporation of a sample of chlorine is readily done colorimetrically, the color being developed with orthophenanthroline in a buffered solution after the iron has been reduced with hydroxylamine. This method is very satisfactory for iron. In 1959, an evaluation was made of a method already used by some laboratories for determining nitrogen trichloride. With this method, the trichloride was allowed to react with concentrated hydrochloric acid to form ammonium chloride and chlorine. The ammonia was then determined by the kjeldahl method when present in small amounts, or colorimetrically by the nessler method when present in lesser concentrations. Reproducible results were readily obtained.
Determination of Impurities in Liquid Chlorine
De Vries, Thomas (author) / Savariar, C. P. (author)
Journal ‐ American Water Works Association ; 52 ; 1338-1340
1960-10-01
3 pages
Article (Journal)
Electronic Resource
English
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