氢化发生-原子荧光光谱法测定云南临沧茶园土壤中锗的含量

Determination of Germanium in Soil of Tea Garden in Yunnan Lincang by Hydride Generation-Atom Fluorescence Spectrometry

采用HNO3-HF-H2SO4-H3PO4敞开酸溶样品消解,氢化物发生-原子荧光法对云南临沧茶产区6块代表性茶园土壤中锗含量进行检测.结果表明,临沧茶产区茶园土壤中锗含量差异较大,锗含量最高的博尚茶园是最低的腊东茶园的3. 84倍,其中3块茶园土壤中锗含量达到了富锗土壤标准(1. 5 mg/kg).该方法检出限为0. 187μg/L,RSD为1. 30%,加标回收率在96. 69%~103. 40%之间.测定结果用微波消解-电感耦合等离子体质谱法进行验证,验证结果显示两种方法测定结果无显著差异,表明HG-AFS法适用于茶园土壤中锗含量的分析.

The concentration of Germanium(Ge)in soil of six representative tea gardens in Yunnan Lincang is detected by hydride generation-atomic fluorescence spectrometry(HG-AFS)digested by HNO3-HF-H2 SO4-H3PO4.The results showed that there was significant difference of the content of Ge between the six tea garden soils.Boshang tea garden with the highest concentration of Ge is 3.84 times of that in Ladong tea garden which has the lowest concentration.Three of them met the Ge-enriched soil standard(1.5 mg/kg).The detection limit of the method is 0.187μg/L;the relative standard deviation(RSD)is 1.30%,and the recovery rate is between 96.69%—103.40%.This method is verified by microwave digestion-inductively coupled plasma mass spectrometry(ICP-MS),and the verification result showed no significant difference between the two methods,which shows the HG-AFS method is suitable means for determination of Ge.