EDTA滴定法快速测定锆铁合金中锆

The EDTA titration quick determination of zirconium in zirconium ferroalloy

试样用盐酸、硝酸、氢氟酸溶解，以硫酸蒸发至冒硫酸烟除去硅和氟。在0．7-1mol／L的硫酸介质中，锆与EDTA形成十分稳定的络合物。以二甲酚橙为指示剂，采取在高酸度下，用EDTA标准溶液滴定锆，消除其它金属离子的干扰，根据EDTA标准溶液消耗量计算锆量，取得了满意的结果，相对标准误差小于1．0％。

Sample was dissolved in hydrochloric acid, nitric acid, hydrofluoric acid, took sulfuric in sulfuric acid and smoked evaporated to remove the silicon and fluorine. In sulfuric acid medium, from 0.7 to 1 mol / L, zirconium and EDTA to form very stable complexes. Xylenol orange as an indicator, take the high acidity, eliminate the interference of other metal ions with EDTA standard solution titration zirconium and zirconium amount is calculated according to the EDTA standard solution consumption, achieved satisfactory results, the relative standard error of less than 1.0%.