The kinetics of dechlorination show that chlorinated organic amines are not completely dechlorinated during typical contact times. Analytical techniques for measuring residual sulfite must maintain pH neutrality in order to represent the actual extent of dechlorination and must allow for rapid and convenient operation near the sampling site in order to minimize errors due to air oxidation during the procedure. A portable, analog circuitry-based instrument using constant current coulometry with amperometric end point detection was developed and evaluated, laboratory and field operation of the instrument showed an analytical range of 0.015-to-25.0 mg sulfite/1. Relative standard deviation was typically 1–2%.
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- Residual Sulfite After Dechlorination of Water
N. V. Ekkad
C. O. Huber
- Springer Netherlands