NIT No. 3 (24-25)/CWA(W and S)III/Item No. 02

DPD Powder Sachet for determination of Free Chlorine in treated water or treated waste water Specification: Specification for DPD Powder for determination of Free 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 Specified Data for Procedure Sensitivity (slope) of 1 mg/L 0,43 Ext. / (mg/L) Limit of Detection (Blanc procedure) 3 x s(blanc) 0,01 mg/L Limit of quantification (Blanc procedure) 9 x s(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.

MAZELINOV SOLUTIONS (BID ID -1530097)