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对测定项目所需的条件进行了研究.在前人研究的基础上提出对土壤浸出液(Tamm试剂)用HNO_3-HCLO_4-H_2SO_4消化法可保证彻底破坏草酸盐,并能消除铁对钼的干扰,至少允许Fe/Mo比为2.5×10~6,Mn/Mo比为2.5×10~6而不致影响对钼的测定.所推荐的方法简便,重现性好、准确度高.在上述条件下,钼的回收率可达93～108%,平均98.8%,C.V.=3.25%(n=25);用振荡半小时后于40℃恒温条件下静置10小时提取土壤有效钼的方法可代替连续振荡8小时的常用法,进一步简化了有效钼的提取.植物全钼分析采用干灰化(520℃)方法,再以HCL提取,灰分的制备液经蒸干处理后于示波极谱仪上测定.在制备液中外加钼的回收试验,其回收率可达94.49～103%,平均99.96%,C.V.=3.45% (n=5).植物全钼分析简便,准确度高.
Based on the previous studies, we propose that HNO_3-HCLO_4-H_2SO_4 digestion of soil leachate (Tamm reagent) can ensure the complete destruction of oxalate and eliminate the interference of iron with molybdenum , At least allowed Fe / Mo ratio of 2.5 × 10 ~ 6, Mn / Mo ratio of 2.5 × 10 ~ 6 without affecting the determination of molybdenum.The recommended method is simple, reproducible, high accuracy.In the above conditions , The recovery rate of molybdenum can reach 93-108% with an average of 98.8% and CV = 3.25% (n = 25). The method of extracting soil available molybdenum by shaking for half an hour at 40 ° C for 10 hours can replace Continuous oscillation for 8 hours of common method to further simplify the extraction of available molybdenum All plant molybdenum analysis using dry ashing (520 ℃) method, and then extracted with HCL, the ash solution was evaporated to dryness by oscillopolarography The recovery of molybdenum in the preparation was 94.49 ~ 103% with an average of 99.96% and CV = 3.45% (n = 5) .The plant Molybdenum analysis was simple and accurate.