石墨炉原子吸收光谱测化探样品痕量镉的改进

THE IMPROVEMENT OF TRACE CD TESTING OF GEOCHEMICAL SAMPLE WITH GRAPHITE FURNACE ATOMIC ABSORPTION SPECTROSCOPY

采用ThermoFisher（热电）SOLAAR M6（Themo Electron Corporation）原子吸收分光光度计，以磷酸氢二铵为基体改进剂测定化探样品中痕量镉。方法检出限DL=0．011μg/g，精密度RSD在2．24％～6．45％，满足化探样品中痕量镉的测定要求。

The trace Cd in geochemical sample is tested with the SOLLAR M6 atomic absorption speetrophotometer and the base improver （ NH4 ） 2 HPO4. The detectability limit of method is DL =0. 011μg/g, precision RSD 2. 24% -6. 45% , which can meet the requirements of the trace Cd testing in geochemical sample.