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sulphide Ion NO.211H S2- Performance Measuring Range 10 to 100 ppm Sampling Time 2 minutes Detecting Limit 1 ppm Colour Change White → Brown Reaction Principle S2- + Pb(CH3COO)2→ PbS Shelf Life 3 Years Corrections for temperature & humidity Unnecessary Store the tubes at cool and dark place. Possible coexisting substances and their interferences (NOTE) Substance Concentration Interference Change colour by itself to Cl- 15000 ppm + No CrO42- 100 ppm - Yellow CO32- 500 ppm + No SO32- 100 ppm - No S2O32- 100 ppm + No