supply of certified reference materials for environmental lab at cmpdi , ri-ii , dhanbad , calcium carbonate volumetric standard , traceable to nist , unit pack-50 gm , chromate standard solution traceable to srm of nist , 1000mg/l cro42- , unit pack-500 ml , fluoride standard solution traceable to srm from nist , 1000mg/l f- , unit pack-500 ml , nitrate standard solution traceable to srm from nist , 1000mg/l , unit pack-500 ml , phosphate standard solution traceable to srm from nist 1000mg/l , unit pack-500 ml , potassium dichromate volumetric standard , traceable to nist srm , unit pack-80 gm , potassium iodate volumetric standard , traceable to nist srm , unit pack-100 gm , sulphate standard solution traceable to srm from nist , 1000mg/l so42- , unit pack-500 ml , hexamethylene tetramine 99% traceable to srm from of nist , unit pack-250 gm , white phenol standard traceable to srm from nist , unit pack-250 gm , platinum cobalt color reference solution ( hazen 500 ) traceable to srm from nist , unit pack-250 ml