Tender For supply of orthophosphoric acid ar grade , ammonium acetate ar grade , sodiumhexametaphosphateextrapure ar 65 70 , calcium chloride dihydrate acs 99 , diethylenetriaminepentaacetic acid dtpa extrapure ar 99 , triethylamine tea extrapure ar 99 5 , eriochrome black t extrapure ar , murexide ammonium purpurate extrapurear 98 , phenolphthalein extrapure ar 99 , methyl red extrapure ar , methyl orangeextrapure ar , potassium chromate extrapure ar 99 5 , ammonium ferric sulphate dodecahydrateextrapure ar acs 99 ammonium iron iii sulphate dodecahydrate ferric alum , diphenylamine extrapure ar 99 part a , methylene blue trihydrate , bromocresol green bcg extrapure ar , potassium ferricyanideextrapure 98 , pycnometer , bod bottles