Ultra-low range chlorine determination

Details Ultra-low range chlorine determination Ultra-low range chlorine determination

1993-10-04

1994-11-08

Warden, Robert J.

Chemistry: analytical and immunological testing

Halogen containing

In aqueous solution

436177, G01N 3112

Patent

active

053626508

ABSTRACT:
A method for determining trace amounts of total chlorine present in a water sample. The method includes use of DPD as an indicator. The sample is filtered after a color development delay, and then light absorbance through the sample is measured. A control sample is treated with malonic acid to de-chlorinate the control. Light absorbance through the sample being tested is adjusted by the light absorbance through the control sample.

REFERENCES:
patent: 3811840 (1974-05-01), Bauer et al.
patent: 4234316 (1980-11-01), Hevey
Patrovsky, "Photometric determination of free chlorine . . . " Chemistry, 80(12), 1986, 1297--1301.
Wang et al. "Improvement of DPD colorimetry for the determination . . . " Huanjing Kexune, 7(1), 74-6, 1986.

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