bids are invited for supply of chemicals 1 20 buffer solution citric acid sodium hydroxide hydrogen chloride colour red traceable to srm from nist and ptb ph 4 25 degree celsius certipur , buffer solution di sodium hydrogen phosphate potassium dihydrogen phosphate colour yellow traceable to srm from nist and ptb ph 7 25 degree celsius certipur , potassium chloride solution nominal 1.41 ms per cm certified reference material for the measurement of electrolytic conductivity traceable to ptb and nist c 0.01 mol per liter certipur , fluoride standard solution traceable to srm from nist naf in h2o 1000 mg per liter f certipur , nitrate standard solution traceable to srm from nist nano3 in h2o 1000 mg per liter no3 certipur , potassium chloride 99.999 suprapur nist srm , sodium carbonate volumetric standard secondary reference material for acidimetry traceable to nist srm certipur , sodium chloride volumetric standard secondary reference material for argentometry traceable to nist srm certipur , sulfate standard solution traceable to srm from nist na2so4 in h2o 1000 mg per liter so4 certipur , bod standard analogue en 1899 standard solution 210 mg per liter , ammonia standard solution 50 ppm , poly propylene sampling bottles 1000 ml narrow mouth , tissue paper roll 2 ply 60 meter , cod chemical 0 to 150 mg per liter , ortho phosphoric acid min 85 percentage emplura , ethyl alcohol , sodium chloride anhydrous emparta , sodium iodide emplura , sulphuric acid concentrated 98 percentage , sodium hydroxide pellet emparta , sodium nitrite emsure , barium chloride dihydrate , phenolphthalein indicator total quantity : 602