Tender For supply of chemicals and crm for brwql d d - phosphate standard solution , nitrate standard solution , ammonia or ammonium chloride , silicate standard solution , bod-crm , potassium hydrogen phthalate for cod , buffer solution ph 9.18 , potassiumchloridesolution , sodium carbonate , potassiumchloride - suprapure , iron standard solution , nickel standard solution , lead standard solution , arsenic standard solution , cadmium standard solution , zinc standard solution , chromium standard solution , copper standard solution , mercury standard solution , ethyl alcohol , fluoride isa buffer , fluoride standard solution , ammonia nitrogen isa buffer , ammonia nitrogen