微波消解石墨炉原子吸收光谱法测定蒙山全蝎中的痕量锗

Determination of Germanium in Mengshan Scorpion by Graphite Furnace Atomic Absorption Spectrometry with Microwave Digestion

建立了石墨炉原子吸收光谱法测定蒙山全蝎中痕量元素锗的方法。通过程序控温、控压的分步微波消解方式消解样品,优化石墨炉升温程序,采用Ni(NO3)2为基体改进剂,以氘灯扣除背景,在265.2nm波长下测定蒙山全蝎中痕量元素锗。在选定分析条件下,锗的检出限为0.30μg/L,RSD的范围为1.2%—3.1%,回收率为88.9%—104.5%。该法用基体改进剂稳定锗,减少了测定时锗的挥发损失;再加上优化的石墨炉升温程序,测定结果准确、可靠。

The samples were digested by temperature-controlled and pressure-controlled microwave.The amount of germanium was determined by graphite furnace atomic absorption spectrometry with Ni（NO3）2 as matrix modifier.Deuterium lamp was used to remove the background for determination of trace elements germanium in Mengshan scorpion under the wavelength of 265.2nm.Under the optimum conditions,the detection limits was found to be 0.30μg/L for germanium.RSD of the method was in the range of 1.2%—3.1%,and recoveries were in the range of 88.9%—104.5%.The use of matrix modifier makes germanium stabilize,the germanium loss has decreased,graphite furnace process is optimized,the method is precise.