Carlosena A, Prada D, Andrade J M, López P, Muniategui S
Department of Analytical Chemistry, Faculty of Sciences, University of La Coruña, E-15071, La Coruña, Spain.
Anal Bioanal Chem. 1996 Jun;355(3-4):289-91. doi: 10.1007/s0021663550289.
The need to determine micronutrients and toxic elements in soils has grown in recent years and cadmium is of special interest. A method has been developed for the determination of cadmium in soils based on a prior acid digestion of the samples with nitric acid in closed Teflon vessels, into a microwave over. The cadmium determination was carried out by graphite furnace atomic absorption spectrometry (GFAAS) with L'vov platform. Optimum operating conditions, analyte modifiers and matrix interferences have been investigated. The best matrix modifier was found to be ammonium dihydrogen phosphate. The interferences are greatly reduced under these operating conditions and calibration can be performed with simple aqueous solutions of the metal standard. The method is rapid and provides accurate and precise results that agree with certified values for two reference materials: BCR 141 (calcareous loam soil) and BCR 277 (estuarine sediment).
近年来，测定土壤中微量营养素和有毒元素的需求不断增加，镉尤其受到关注。已开发出一种基于在密闭的聚四氟乙烯容器中用硝酸对样品进行预酸消解，然后在微波炉中进行消解的方法来测定土壤中的镉。采用带热解涂层石墨管平台的石墨炉原子吸收光谱法（GFAAS）进行镉的测定。研究了最佳操作条件、分析物改性剂和基体干扰。发现最佳的基体改性剂是磷酸二氢铵。在这些操作条件下，干扰大大降低，并且可以使用金属标准的简单水溶液进行校准。该方法快速，能提供准确且精密的结果，与两种标准物质（BCR 141（石灰质壤土）和BCR 277（河口沉积物））的认证值相符。
