【摘要】 研究了在酸性介质中,痕量尿素对NO2-催化KBrO3氧化维多利亚绿G的阻抑作用,通过测量617 nm处吸光度的变化,建立了测定痕量尿素的阻抑动力学光度分析的新方法。在最佳实验条件下,测定尿素的线性范围为0.0~0.14mg/L,检出限为5.0×10-6g/L。对2.0μg/25 mL进行10次平行测定的相对标准偏差为2.8%。并试验了共存离子对催化反应的影响,常见的离子均不干扰测定。方法可用于废水中痕量尿素的测定。更多还原

【Abstract】 A simple and sensitive catalytic inhibition kinetic spetrophotometric method for the determination of trace amounts of urea has been developed.The method is based on the inhibition effect of urea on the nitrite catalyzing oxidation of victory green stand G by potassium bromate in dilute HCl medium.The absorbance is measured at 617 nm.Under the optimum conditions,the linear range of determination is 0～0.14 mg/L.The detection limit is 5.0×10^-6 g/L.The relative standard deviation was 2.8%（n=10,2.0 μg/25 mL,urea）.The effects of foreign ions are discussed.The familiar ions do not interfere with this reaction.The method is applied to the determination of urea in waste water.更多还原