wbphed / ee / msd / nieq / 11 / 21-22_1 supplying and delivery of laboratory chemicals / reagents to 19 ( nineteen ) nos. water testing laboratory for national rural drinking water quality testing monitoring surveillance programme in state of west bengal under , disodium dihydrogen versenate solution ( 0.01 m ) ( edta ) , ammonia buffer , hydrochloric acid gr , chloroform gr , hydrochloric acid commercial grade , ferrospectral reagent solution , range0.005-5.00 mg / l , tin ( ii ) chloride dihydrate gr , potassium iodide gr , silver diethyldithio carbamate gr for analysis of arsenic, 1.01515 , zinc filling ( 1-2 width ) for arsenic test , manganese reagent, range 0.010-10.0 mg / l mn ( 250 test ) , tissue papers , extran ma 02 , acetone , spirit lamp solvent , biosol , arsenic standard soln. , iron standard soln , ph buffer solution ( 4.01 ) , ph buffer solution ( 7.00 ) , ph buffer solution ( 10.01 ) , spectroquant chlorine test ( free ) range 0.010-6.00 mg / l cl2 , glass wool, low lead, 250 gm , petri dish 75 mm ( disposal ) , membrane filter gridded, sterile, individually packed, 47mm dia / 0.45micron porosity. , chromogenic coliform agar for simulteneous determination & count of escherichia coli and total coliform in water sample as per iso 9308.1:2014