土壤中交换态和易还原态锰的原子吸收分光光度测定法

Determination of Exchangeable and Reducible Manganese in Soil by Atomic Absorption Spectrophotometry

目的建立土壤中交换态锰和易还原态锰的测定方法。方法用中性乙酸铵溶液提取土壤中交换态及易还原态锰,用原子吸收分光光谱法连续测定其含量。结果交换态与易还原态锰的线性范围分别为0.40～2.00、1.00～5.00μg/ml,检出限分别为0.012、0.0078μg/ml,RSD小于2%,加标回收率分别为100.2%,98.8%,相关系数分别为0.9992,0.9995。结论该方法简便、快速,准确度和灵敏度均满足实验要求。

Objective To establish a rapid determination method for the exchangeable and reducible manganese. Methods In NH,Ac solution, manganese was determined by flame atomic absorption spectrophotometry. Results The linear ranges was 0.40- 2.00 ug/ml for exchangeable manganese and 100-5,00 ug/ml for reducible manganese respectively. The detection limits were 0.012 ug/ml for exchangeable manganese and 0.007 8ug/ml for reducible manganese respectively. The RSDs were lower than 1.2%. The recovery rates were 100.2% for exchangeable manganese and 98.8% for reducible manganese respectively.The correlative coefficients were 0.999 2 for exchangeable manganese and 0.999 5 for reducible manganese respectively. Conclusion This method is rapid, simple, sensitive and accurate.