【摘要】 在弱酸性介质中，当有活化剂氨三乙酸存在时，铬（Ⅵ）对氯酸钾氧化罗丹明Ｂ褪色的反应具有强烈的催化作用。本文以此反应为指示反应，利用固定时间法研究了该催化反应的条件，建立了催化动力学光度法测定痕量铬（Ⅵ）的新方法。该方法的检出限为０．１５ｎｇＣｒ／ｍｌ，线性范围为０～２０ｎｇＣｒ／ｍｌ．将本方法用于水中痕量铬（Ⅵ）的测定，结果令人满意．更多还原

【Abstract】 A new catalytic kinetic method for determination of trace chromium has been developed.The method is based on the catalytic effect of Cr(Ⅵ)on the oxidation of rhodamine B with potassium chlorate in the walpole buffer solution(pH=3).The detection limit is 0.15 ng/ml of Cr,The linear raiige is obtanined for 0～20 ng/ml of Cr,The method has been used to determine trace Cr(Ⅵ)in water with satisfactory results.更多还原