ICP-OES法测定石灰性土壤中交换性盐基钙镁钾钠

The Determination of Calcium Magnesium Potassium Sodium in Calcareous Soil by ICP-OES

[目的]采用ICP-OES法同时测定石灰性土壤中交换性盐基钙镁钾钠。[方法]用pH 8.5的0.1 mol/L氯化铵溶液-70%乙醇溶液作为交换浸提液,交换浸提液稀释5倍,盐酸酸化,ICP-OES同时测定石灰性土壤中交换性盐基钙镁钾钠。[结果]方法检出限:Ca0.751 cmol/kg,Mg 0.344 cmol/kg,K 0.060 cmol/kg,Na 0.135 cmol/kg。用国家一级标准物质和不同地区石灰性土壤进行验证,方法准确度和精密度均小于5%。[结论]该方法能够满足生态地球化学评价样品中交换性盐基钙镁钾钠的测定。

[ Objective] To determine calcium magnesium potassium sodium in calcareous soil at the same time using ICP-OES. [ Method] A determination method of exchangeable base calcium magnesium potassium sodium in calcareous soil with pH 8.5 0. 1 mol/L ammonium chloride so- lution -70% ethanol solution as the exchange of leaching solution was established. The exchange of leaching solution was diluted 5 times, and calcium magnesium potassium sodium with ICP-OES at the same time were determined. [ Result] Method detection limit： Ca 0. 751 cmol/kg, Mg 0.344 cmol/kg, K 0. 060 cmol/kg, Na 0. 135 cmol/kg. Verifying with national standard substance and different regional calcareous soil, method accuracy and precision were all less than 5%. [ Conclusion ] The method can meet the determination of exchangeable basecaleium magnesium potassium sodium in the ecological geochemical evaluation samples.