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土壤样品用高氯酸——硝酸——氢氟酸或在高压罐中分解后.以0.2％草酸水溶液提取,继以最大功率升温石墨炉原子吸收测定锡,将草酸介质与目前常用的盐酸介质比较.具有试剂空白低、灵敏度高和干扰少等优点,本文还讨论了用抗坏血酸消除高氯酸干扰的方法,在含锡量为3.5—12.5μg/g的样品中加入标准锡的回收率为92—112％,取锡含量为3.8μg/g的土壤样品,作七份平行试验,其相对标准偏差为3.2％。
Soil samples with perchloric acid - nitric acid - hydrofluoric acid or after decomposition in high pressure tank to 0.2% aqueous oxalic acid extraction, followed by the maximum power graphite furnace atomic absorption spectrometry determination of tin, the oxalic acid medium and currently used hydrochloric acid medium Compared with low reagent blank, high sensitivity and less interference, etc., this article also discusses the use of ascorbic acid to eliminate perchlorate interference method, the tin content of 3.5-12.5μg / g samples added tin standard recovery of 92-112%. The soil samples with tin content of 3.8μg / g were tested in seven parallel experiments with the relative standard deviation of 3.2%.