NIT No. 15(21-22)/CWA(WnS)II HP

Specification for DPD Powder for determination of Total Chlorine in treated water or treated waste water The DPD (N,N-Diethyl-1.4-phenylendiamine) powder pouch for single test of Residual Chlorine is required for measuring range between 0.02 to 3.5 mg/l in chlorine treated water or waste water through any photometer / spectrophotometer at the wave length of 530 nm if sample is taken in the cuvette of 24 mm. Specified data for determination/procedure will be in accordance with ISO 8466- 1 and DIN 38402 A51. The DPD powder must be free from boric acid and based on green chemist Specified Data for Procedure Sensitivity (slope) of 1 mg/L 0,43 Ext. / (mg/L) Limit of Detection 3 x s (Blanc procedure) (blanc) 0,01 mg/L Limit of quantification 9 x s (Blanc procedure) (blanc) 0,03 mg/L Confidence Interval (95%) +/- 0,049 mg/L Method standard deviation 0,021 mg/L Method variation coefficient +/- 1,13 % Shelf Life: 5 Years Packaging: Individual stick like air tight sealed pack with narrow geometry ensuring moisture free and long shelf life of the reagent.

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