石墨炉原子吸收分光光度法测定水中钛  

Determination of Titanium in Water by Graphite Furnace Atomic Absorption Spectrophotometry

作　　者：杜青[1] 任兰[1] 

机构地区：[1]南京市环境监测中心站,南京210013

出　　处：《化学分析计量》2016年第6期75-79,共5页Chemical Analysis And Meterage

基　　金：国家环保部标准制修订项目(949)

摘　　要：建立石墨炉原子吸收分光光度法测定水中痕量可溶性钛和总钛.测量可溶性钛的样品通过0.45 μm 水系微孔滤膜过滤后直接测定,测量总钛的样品根据不同类型采用硝酸、过氧化氢、硫酸的不同组合进行消解.通过试验确定了最佳石墨炉程序升温工作条件和热解涂层石墨管的应用.干扰试验表明水中常见共存离子不干扰钛的测定.本方法经6 家实验室验证,在0～250 μg/L 范围内线性良好,方法检出限可溶性钛为4.0 μg/L,总钛为7.0μg/L.测定结果的相对标准偏差不大于12%（n=6）,加标回收率为90.0%～107%,该方法对钛标准物质测定结果的相对误差为–3.4%～2.4%.该方法准确、可靠,检出限低,干扰少,易于推广应用.The method for determination of soluble titanium and total titanium in water by graphite furnace atomic absorption spectrometry was established. Soluble titanium sample was filtered by 0.45 μm microporous membrane and total titanium sample was digested by different regent–nitric acid,hydrogen peroxide,sulfuric aicd and their combination according to different type of sample. The optimal measurement parameters and graphite tube available were developed through experiments. Co-existent element interference was undetected in normal samples. The method was verified by six laboratories, the linear range was 0–250 μg/L,the detection limit was 4.0 μg/L for soluted titanium and 7.0 μg/L for total titanium, the RSD of determination results was not more than 12%（n=6）, and the recoveries ranged from 90.0% to 107%. The relative error of determination results of Ti standard material with this method ranged from –3.4% to 2.4%. This method is accurate and reliable with less interference and easy to be popularized and applied.

关 键 词：水样 钛 石墨炉原子吸收分光光度法 

分 类 号：O657.3[理学—分析化学]