Premium
Specificity of the DPD and Amperometric Titration Methods for Free Available Chlorine: A Review
Author(s) -
Jensen James N.,
Johnson J. Donald
Publication year - 1989
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.1551-8833.1989.tb06894.x
Subject(s) - amperometric titration , titration , amperometry , chloramine , chlorine , chemistry , interference (communication) , chromatography , analytical chemistry (journal) , inorganic chemistry , electrode , potentiometric titration , electrochemistry , computer science , organic chemistry , computer network , channel (broadcasting)
Both the DPD and amperometric titration methods for measuring free available chlorine (FAC) are subject to interference from monochloramine and organic chloramines. The measured FAC concentration in the presence of chloramines is often significantly larger than the true FAC residual. Interference in the DPD method can be reduced by rapid titrations. Interference in the amperometric titration method can be minimized by maintaining a 200‐mV positive potential on the platinum electrode.