摘要： 采用石墨炉原子吸收法直接测定鲨鱼肝脏中的痕量镉，试验发现，在HNO3-H2SO4-HClO4体系、HNO3-H2O2体系、HCl-HNO3体系、HF-HClO4体系中，以HF-HClO4 体系消化效果最佳，经试验，0.2 g样品用1 mL HF，2 mL HClO4消溶效果较好。以HF-HClO4体系为消化试样、微波消解，用Pd(NO3)2作基体改进剂，灰化温度1 000 ℃，原子化温度2 200 ℃。该方法相对标准偏差为1.5%，标准物质测定值在其推荐值范围内，该方法快速、简便、准确。
关键词：微波消解;石墨炉原子吸收分光光度法;鲨鱼肝脏;镉
Abstract：In the present work, a method was developed for the determination of cadmium in shark liver by means of graphite furnace atomic absorption spectrometry with microwave digestion, and a systematic study was carried out by selection of the most appropriate working conditions and optimization of the sample mass. The samples were digested by microwave with mixed acid of HF-HCIO4(1∶2). Trace amount cadmium was determined by graphite furnace atomic absorption spectrometry(GFAAS) with Pd(NO3)2 as a matrix modifier. If appropriate working conditions are chosen, the method finally proposed shows interesting features for the determination of the analyte in the samples such as: suitable precision values. To assure the analytical quality, porcine liver GBW 08551 was used as a standard reference material. The measured values were in a good agreement with the certified ones within the analytical error of ±10%. The method is simple and rapid with accurate results.
