EDTA络合滴定法持续测定铁矿石中钙和镁研究

Determination of Calcium and Magnesium in Iron Ore by Edta Complexmetric Titration

对铁矿石中铜、铅、锌、镍、锰等干扰元素进行处理后,在pH值=10的氨水-氯化铵溶液中,以酸性铬兰K-萘酚绿B为指示剂,利用EDTA络合滴定法测定钙、镁的合量;随后另取一份样品容液加入适量氢氧化钾溶液,将pH值调至13左右,以钙试剂为指示剂,用同样的方法测定钙含量,将钙镁合量减去钙量来计算镁含量。

After the treatment of copper, lead, zinc, nickel and manganese in iron ore, In the aqueous solution of =10 ammonium chloride, with acid chrome blue K-naphthol green B as indicator, determination of the content of calcium and magnesium by EDTA complexometric titration, then take a sample containing liquid adding potassium hydroxide solution, PH value of about 13, calcium reagent as indicator, determination of calcium content in the same way, subtracting the amount of calcium and magnesium to calculate the amount of magnesium content.