Tender For tender for supply of certified reference material : - ph buffer solution - potassium hydrogen phthalate of ph-4 at 25 deg. c - standard for ph analysis , ph buffer solution - potassium hydrogen phthalate/disodium hydrogen phosphate of ph-7.0 at 25 deg. c - standard for ph analysis , ph buffer solution - boric acid/potassium chloride/sodium hydoxide of ph-10 at 25 deg. c - standard for ph analysis , standard for sulphide s-2 content analysis - potassium dichromate volumetric standard , secondary reference material for redox titration , traceable to nist , standard for sulphide s-2 content analysis - sodium sulphide nona hydrate - sulphide s-2 content , standard for total suspended solid tss , celite-545 , particle size 0.02-0.1 mm , standard for total suspended solid tss , sigmacell cellulose type 20 , standard for chemical oxygen demand cod - 100 ppm , packing size , standard for chemical oxygen demand cod - 200 ppm , packing size , standard for chemical oxygen demand cod - potassium hydrogen phthalate , standard for biological oxygen demand - glucose , standard for biological oxygen demand -glutamic acid , standard for biological oxygen demand - analogue en 1899 standard solution 210 mg/l , standard for oil and grease stearic acid , standard for oil and grease - hexadecane analytical standard , 5ml , standard for phenol analysis , certified reference material crm , 1gm , iron standard solution -1000 mg/l fe , fe(no3)2 in hno3 0.5 mol/l , silicon standard solution - 1000 mg/l si , (nh4)2sif6 in h2o , zinc standard solution -1000 mg/l zn , zn(no3)2 in hno3 0.5 mol/l , water standard at 0.01% for coulometric karl fischer titration
23 Mar, 2026
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