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Determination of Nitrogen Trichloride in Water
Author(s) -
Palin Arthur T.
Publication year - 1968
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.1968.tb03615.x
Subject(s) - chlorine , chemistry , chloramine , stock solution , dilution , fraction (chemistry) , iodide , iodine , inorganic chemistry , chromatography , organic chemistry , thermodynamics , physics
This study compares diethylpara‐ phenylene diamine (DPD) results for chlorine and chloramines in water with total chlorine figures obtained iodometrically. A discrepancy arises whenever NCl 3 is present, because only half of this compound is recovered. This half appears in the dichloramine fraction. The remaining half of the NCl 3 , however, can be made to react in the free chlorine fraction by adding a small amount of potassium iodide. In this way the total NCl 3 content may be obtained and the dichloramine reading corrected for the NCl 3 that appears with it. These conclusions apply only to the low concentrations of NCl 3 that may be formed in the chlorination of waters or obtained by diluting freshly prepared stock solutions. Solutions of NCl 3 that have been allowed to stand before dilution give inconsistent results.