tender for procurement of chemical and reagent for 15 nos. aqua service centre (asc) laboratories of tresp sub-division under fisheries piu, tresp, world bank-funded project. , laying and jointing pvc pipe. heading , buffer solution, ph-4 (500 ml) , buffer solution, ph 7 (500 ml) , buffer solution ph 10 (500 ml) , concentrated sulphuric acid (1 l ) , diphenylamine indicator (250 gm) , edta(100 gm) , ethanol (1 l) , ferrous ammonium sulphate (500 gm) , formaldehyde (500 ml) , hydrochloric acid (5 l) , manganous sulphate (500 gm) , methyl orange indicator (125 ml) , orthophosphoric acid (500 ml) , phenolphthalein indicator solution (125 ml) , potassium dichromate (500 gm) , potassium iodide (100 gm) , sodium azide (100 gm) , sodium hydroxide (500 gm) , sodium thiosulphate (100 gm) , starch indicator (100 ml) , universal indicator (100 ml)