bids are invited for procurement of certified reference material for nrwql under uyd cwc new delhi - chemical , electrode , plasticware , labware , solution - 1 boron standard solution 1000 ppm 2 phosphate standard solution 1000 ppm 3 potassium chloride kcl suprapur 4 nitrate ion sensitive electrode for ion meter 9707bnwp 5 copper standard solution 1000 ppm 6 chromium standard solution 1000 ppm 7 arsenic standard solution 1000 ppm 8 zinc standard solution 1000 ppm 9 mercury standard solution 1000 ppm 10 iron standard solution 1000 ppm 11 lead standard solution 1000 ppm 12 cadmium standard solution 1000 ppm 13 tuning solution 14 vials 15ml tarson 15 centrifuge tubes 16 buffer solution ph 4 red 17 buffer solution ph 7 yellow 18 fluoride standard solution 1000 ppm 19 nitrite standard solution 1000 ppm 20 sodium carbonate 21 sodium chloride 22 sulphate standard solution 1000 ppm 23 turbidity std 800ntu 24 turbidity std 0.02ntu 25 turbidity std 20ntu 26 turbidity std 100ntu 27 potassium chloride solution 28 icpms stock tuning solution total quantity : 49