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阻抑催化动力学光度法测定水体中的痕量镍 被引量:2

Determination of Trace Nickle in Water by Inhibitory Catalytic Kinetic Spectrophotometry
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摘要 研究了在pH9.2硼砂介质中,镍(II)对过氧化氢氧化溴甲酚紫褪色反应具有阻抑作用,聚乙二醇-200(PEG-200)对此反应体系有活化作用,据此建立了阻抑动力学光度法测定痕量镍(II)的新方法。试验考察了反应介质种类和用量、活化剂种类和用量、反应温度、反应时间、共存组分等因素的影响,确定了最佳试验条件。该方法的测定波长为590nm;活化剂为PEG-200;反应温度为沸水浴;反应时间为14min;线性范围为1.7×10-6g/L~1.4×10-4g/L;检出限为1.7×10-6g/L。所建方法用于环境水体中痕量镍(II)的测定,最大相对标准偏差为3.27%,加标回收率为95.5%~104.5%;所建方法与火焰原子吸收光谱法进行了对比试验,方法相对误差小于6.50%。 A simple and sensitive inhibitory kinetic spectrophometry for determining the micro amounts of nickle was developted.The method is based on minus catalytic of nickle ion on the oxidation of bromcresol purplet by hydrogen peroxide in borax medium. Major factors such as kinds and dosages of media,reagents and activators,the reaction temperature,the reaction time and coexisting irons are investigated,and the optimal experimental conditions are defined.Under the optumum experimental conditions,the wavelength fo...
出处 《环境科学与技术》 CAS CSCD 北大核心 2010年第10期101-105,共5页 Environmental Science & Technology
基金 辽宁省教育厅基金项目资助(05L274)
关键词 阻抑催化 动力学光度法 溴甲酚紫 过氧化氢 inhibitory catalysis kinetic spectrophometry nickel bromcresol purplet hydrogen peroxide
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