悬浮液进样_石墨炉原子吸收测定钒钛磁铁矿中痕量镓  

Determination of Trace Gallium in Sefstrmite by Graphite Furnace Atomic Absorption Spectrometry Using Suspension Technique

作　　者：张秀荣[1] 邵光[1] 王勺 单孝全[2] 

机构地区：[1]北京科技大学化学系 [2]中科院生态环境研究中心

出　　处：《岩矿测试》1997年第1期60-64,共5页Rock and Mineral Analysis

基　　金：冶金部重点课题

摘　　要：研究了悬浮液进样＿石墨炉原子吸收测定钒钛磁铁矿中痕量镓的分析方法。以Ｎｉ（Ⅱ）作为基体改进剂时，可直接用镓标准溶液进行校准。样品粒度＜３８μｍ、悬浮液中试样质量浓度在０１～８０ｇ／Ｌ、含镓质量浓度不超过１００μｇ／Ｌ时呈良好线性关系，检出限为２４μｇ／Ｌ镓。用所拟方法测定了含镓量在１６～４２μｇ／ｇ的标准矿样，结果与标准值相符，６次平行测定的相对标准偏差不超过９％，满足痕量分析的要求。A method has been developed for determination of trace Ga in sefstrmite by graphite furnace atomic absorption spectrometry with suspension technique. The powdered sample( d p<38 μm) is suspended in EtOH HNO 3 aqueous employed to stabilize suspension and the suspension is pipetted directly into electrothermal atomizer. The calibration curve can be built up with aqueous standards in presence of chemical modifier Ni(Ⅱ). The detection limit for Ga is 2.4 μg/L, with linear range of 0.24～100 μg/L when the sample in suspension is in a range of 0.1～8.0 g/L. The method has been applied to the determination of Ga in standard reference sefstrmite samples with 16～42 μg/g of Ga . The results are in good agreement with certified values and the precision is <9% RSD( n =6).

关 键 词：钒钛磁铁矿 镓 悬浮液 石墨炉 原子吸收法 

分 类 号：P575.4[天文地球—矿物学]