全自动消解-石墨炉原子吸收法测定土壤中镉的探讨

Determination of Cd in Soil Samples by Automatic Digestion Instrument and Graphite Furnace Atomic Absorption Spectrometry

探讨全自动消解-石墨炉原子吸收法测定土壤中镉的方法。选用硝酸-氢氟酸-高氯酸作为消解体系,采用全自动消解仪对土壤样品进行消解,通过研究干燥、灰化和原子化温度对吸光度的影响,优化出最佳的石墨炉升温程序,依据国标方法(GB/T17141-1997)石墨炉原子吸收分光光度法测定土壤样品中的镉元素含量。该方法检测土壤国家标准物质GSS-8、GSS-22、GSS-24等,所得结果与标准值相吻合。方法简便、快速、重现性好、灵敏度高,适用于批量土壤样品中Cd的测定。

the method of determination of cadmium in soil by full automatic digestion-graphite furnace atomic absorption method was discussed.Nitric acid-hydrofluoric acid-perchloric acid was chosen as the digestion system.The soil sample is digested by automatic ablator.By studying the effects of ash and atomization temperature on light absorption,Optimization of the best graphite furnace heating procedures,?According to the standard method(GB/T17141-1997)Determination of cadmium in soil samples by graphite furnace atomic absorption spectrophotometry,This method is used to detect soil national standard substances,GBW07408、GBW07446、GBW07451,The result is consistent with the standard value.The method is simple,quick and high sensitivity.Suitable for determination of cadmium in bulk soil samples.