bids are invited for mercury standard solution 1000 mg/l, hg, traceable to nist , zinc standard solution traceable to srm/crm from nist , sodium chloride volumetric standard solution, traceable to srm/crm from nist , arsenic standard solution traceable to crm/srm from nist certified/1000 mg/l , buffer solution ph 4, traceable to nist , potassium chloride standard solution, traceable to srm/crm from nist 1000 mg/l , chromium standard solution1000 mg/l, cr traceable to nist , cadmium standardsolution, 1000mg/l, cd traceable to nist , buffersolution ph 9, traceable to nist , potassiumdichromate volumetric standard solution,traceable to srm/crm from nist , sodium carbonatevolumetric standard solution, traceable tosrm/crm from nist total quantity : 11