Cr(Ⅲ )因为具有较强的氧化能力 ,而对肺、肾、肝都具有毒性作用 ,在污水及天然水中 ,Cr含量很低 ,目前还没有足够选择性和灵敏性方法对水样中痕量Cr(Ⅲ )进行直接测定。本文采用催化动力学分析方法 ,利用Cr(Ⅲ )对高碘酸盐与亚砷酸盐体系在中性或弱碱性条件下具有催化能力 ,应用高氯酸根离子选择性电极电位法间接测定了Cr(Ⅲ )的含量 ,最低检测限为 0 .9μg ml,取得了满意的结果。 Cr (Ⅲ) has a toxic effect on lung, kidney and liver because of its strong oxidizing ability. In wastewater and natural water, Cr content is very low. At present, there is not enough selectivity and sensitivity to detect trace of water The amount of Cr (Ⅲ) for direct determination. In this paper, a catalytic kinetic analysis method was used, and the catalytic ability of periodate and arsenite systems on neutral or weak alkaline conditions was investigated by using Cr (Ⅲ). The perchlorate ion selective electrode potential method was used to determine Cr (Ⅲ) content, the minimum detection limit of 0.9μgml, and achieved satisfactory results.