微波消解原子分光光度法测定土壤中锌含量消解液的筛选

摘要

Objective] To select the optimal digestion solution for determining Zn in soil by microwave digestion – FAAS.[Methods] micro-wave digestion –FAAS was applied.Hydrochloric acid +nitric acid +hydrofluoric acid and hydrochloric acid +nitric acid +hydrogen per-oxide solution were taken as digestion solution separately.And comparative analysis experiment was carried.[Results] In the process of determi-ning Zn in soil by microwave digestion – FAAS, the digestion was complete when using hydrochloric acid +nitric acid +hydrofluoric acid as digestion solution, but the absorbance was abnormal and irregularity was high, leading to failure of the experiment; hydrochloric acid +nitric acid +hydrogen peroxide solution as the digestion solution could dissolve most Zn element in soil and satisfy the analysis requirement .[ Conclu-sion] Taking hydrochloric acid +nitric acid +hydrogen peroxide solution as the digestion solution meets requirement of analysis precision in determining the soil Zn content.%[目的]筛选微波消解原子分光光度法测定土壤中锌含量的最优消解液。[方法]采用微波消解原子分光光度法测定土壤中锌含量，分别用盐酸＋硝酸＋氢氟酸、盐酸＋硝酸＋双氧水作为消解液，对土壤样品进行微波消解，通过对比分析试验，优化合适的消解液。[结果]微波消解原子分光光度法测定土壤锌含量过程中，采用盐酸＋硝酸＋氢氟酸消解液，消解较为完全，但是吸光度异常、无规律偏高，导致试验失败；盐酸＋硝酸＋双氧水消解液，能溶解土壤中大部分锌元素，满足分析要求。[结论]采用盐酸＋硝酸＋双氧水作为消解液测定土壤锌含量满足分析精度要求。