supply of certified reference material ( chemicals ) for environment lab at cmpdi , ri-ii , dhanbad , boron standard solution traceable to srm from nist , 1000mg/l , buffer solution traceable to srm from nist , ph 9 . 0 , buffer solution traceable to srm from nist , ph 4 . 0 , buffer solution traceable to srm from nist , ph 7 . 0 , calcium carbonate volumetric standard , traceable to nist , calcium standard solution tracable to srm from nist , 1000 mg . l ca , chloride standard solution traceable to srm from nist , 1000 mg/l cl- , chromate standard solution traceable to srm of nist , 1000mg/l cro42- , chromium standard solution traceable to srm from nist , 1000mg/l cr , fluoridestandard solution traceable to srm from nist , 1000mg/l f- , nitrate standard solution traceable to srm from nist , 1000mg/l , phosphate standard solution traceable to srm from nist 1000mg/l , potassium dichromate volumetric standard , traceable to nist srm , potassium iodate volumetric standard , traceable to nist srm , sulphate standard solution traceable to srm from nist , 1000mg/l so42- , hexamethylene tetramine 99% traceable to srm from nist , hydrazine sulphate >99% traceable to srm from nist , sodium sulphide nanohydrate ( na2s . 9h2o ) traceable to srm from nist , white phenol standard traceable to srm from nist , platinum cobalt color reference solution ( hazen 500 ) traceable to srm from nist , sodium sulphite >97% acs reagent traceable to srm from nist , sodium nitrite ( nano2 ) traceable to srm of nist , copper standard solution traceable to srm from nist , 1000 mg/l cu , iron standard solution traceable to srm from nist 1000 mg/l , manganese standard solution traceable to srm from nist 1000 mg/l , nickel standard solution traceable to srm from nist 1000 mg/l , zinc standard solution traceable to srm from nist , 1000 mg/l zn , selenium standard solution traceable to srm from nist , 1000 mg/l se , arsenic standard solution traceable to srm from nist 1000 mg/l , lead standard solution traceable to srm from nist 1000 mg/l , mercury standard solution traceable to srm from nist 1000 mg/l , cadmium standard solution traceable to srm from nist 1000 mg/l , chromium standard solution traceable to srm from nist 1000 mg/l