bids are invited for potassium chloride , sodium hexametaphosphate , sodium hydroxide , boric acid , methyl red , bromocresol green , potassium dichromate , diphenylamine indicator , sulphuric acid , sodium fluoride , magnesium oxide , salicyclic acid , sodium thiosulphate , potassium sulphate , copper sulphate , selenium powder , nitric acid er , ammonium molybdate , antimony potassium tartarate , ascorbic acid , potassium dihydrogen orthophosphate , stannous chloride , barium chloride dihydrate , ethanol , glycerol , magnesium chloride hexahydrate , gum acacia , potassium nitrate , magnesium sulphate heptahydrate , edta disodium salt , ammonium chloride , erichrome black t , dtpa , azomethine -h , activated charcoal powder , curcumin , oxalic acid , silver chloride , tisab iii , murexide ammonium purpurate , sodium acetate , sodium sulphate , barium chloride , potassium chromate , silver nitrate , aluminium potassium sulphate , lead standard solution , cadmium standard solution , zinc standard solution , iron standard solution , manganese standard solution , sulphate standard solution , boron standard solution , copper standard solution , nickel standard solution total quantity : 42011