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原子吸收光谱法测定岩石矿物中银是一种比较好的常用方法。但当基体浓度较高,银含量较低时,溶样后直接测定有背景干扰。本文用三正辛胺(TOA)柱色层萃取—硫脲解脱,原子吸收法(ppm级用火焰法,ppb级用石墨炉法)测定银。萃取操作简便,色层柱连续反复使用20次不致失效。 一、仪器工作条件及主要试剂 日立170—30型原子吸收光谱仪,工作条件:光源—银空心阴极灯;灯电流—7.5.mA,波长—328.1nm;通带—0.4nm;空气压力—1.5kg/cm~2;乙炔压力—0.2kg/cm~2。
Determination of silver in rock and mineral by atomic absorption spectrometry is a good and commonly used method. However, when the substrate concentration is high, the silver content is low, the direct determination of background interference after dissolution. In this paper, three-octylamine (TOA) column chromatography extraction - thiourea release, atomic absorption method (ppm flame method, ppb graphite furnace method) determination of silver. Extraction operation is simple, chromatography column repeated 20 times without failure. First, the instrument working conditions and the main reagent Hitachi 170-30 atomic absorption spectrometer, working conditions: light source - silver hollow cathode lamp; lamp current -7.5.mA, wavelength -328.1nm; passband -0.4nm; air pressure -1.5kg / cm ~ 2; acetylene pressure -0.2kg / cm ~ 2.