bids are invited for chemicals , iron standard solution , cadmium aas std soln , mercury standard solution , silver aas std soln , molybdenum aas std soln , copper standard solution , zinc aas std soln , manganese standard solution , lead standard solution , cobalt aas std soln , nickel aas std soln , arsenic aas std soln , indium standard solution , tin aas std soln , palladium aas std soln , platinum aas std soln , gold aas std soln , chromium aas std soln , silicon aas std soln , benzene solution , ethyl acetate soln , o-xylene soln , buffer soln , buffer solution ph , hexane , potassium dichromate volumetric standard , acetone solution , potassium iodide , lanthanum , phosphorus aas std soln , acetophenone for synthesis total quantity : 39