火焰原子吸收光谱法测定白酒中铁、锰的方法比较

Comparison on determination methods of iron and manganese in Baijiu(Chinese liquor) by flame atomic absorption

采用酸消解法和水浴蒸发法对样品进行前处理，利用火焰原子吸收光谱法测定白酒中铁、锰的含量。在确定了仪器最佳工作条件下，对两种方法进行了对比试验，结果表明：酸消解法铁、锰的精密度试验结果相对标准偏差（RSD）分别为铁：0．96％，锰：6．72％；加标回收率分别为铁：97．7％～102．3％，锰：95．2％～103．3％。水浴蒸发法铁、锰的精密度试验结果相对标准偏差（RSD）分别为铁：1．16％，锰：5．54％：加标回收率分别为铁：98．1％～103．4％，锰：95.3％～105．3％。两方法无显著差异，精密度和准确度均符合国标要求，但水浴蒸发法具有操作简单、速度快、节约试剂等特点，同时也适用于白酒中其他金属元素的测定。

Using acid digestion and water bath evaporation as pretreatment methods, iron and manganese contents in Baijiu （Chinese liquor） were de- termined by a flame atomic absorption spectrometry （FAAS） method. Comparison tests of two pretreatment methods were conducted after confirming the optimal instrument working conditions, the results showed that the relative standard deviations of precision tests of iron and manganese for acid digestion were 0.96% and 6.72% respectively. The recovery rate of iron and manganese were 97.7%-102.3% and 95.2%-103.3%, respectively. The relative standard deviations of precision tests of iron and manganese for water bath evaporation were 1.16% and 5.54%, respectively. The recovery rate of iron and manganese were 98.1%-103.4% and 95.3%-105.3%, respectively. The results had no distinguished differences and the precision and accuracy were in accord with national requirements. Nevertheless, the method of water bath evaporation had the advantages of simple operation, rapid measurement; reagent saving etc, the method could be applied for other metals determination in Baijiu.