ICP-AES直接测定土壤中多种交换性阳离子组成  

Directly Determining the Exchangeable Cations in Soil by ICP-AES

作　　者：杨乐苏[1] 

机构地区：[1]中国林业科学研究院热带林业研究所,广州510520

出　　处：《广东林业科技》2008年第6期20-23,共4页Forestry Science and Technology of Guangdong Province

基　　金：国际科技合作计划项目(2007DFA31070)

摘　　要：用5 g土样加50 mL的1mol.L-1乙酸铵振荡30 min,提取液用电感耦合等离子发射光谱ICP-AES法直接测定土壤中多种交换性阳离子。该方法的钙(Ca)、镁(Mg)、钾(K)、钠(Na)和锰(Mn)检出限分别为:0.003 6,0.006 9,0.033 6,0.001 43,0.035μg.mL-1,通过对国家标准物质土壤有效态的测试,结果与标准值基本一致,测得值都在标准值的不确定度范围内。GBW07416标准物质11次测定钙、镁、钾、钠和锰的相对误差(RE)分别为-1.94%,6.61%,-2.5%,-9.09%和3.59%,测定结果的RSD分别为:0.96%,1.80%,4.65%,0.54%,0.71%。Add 50 mL ammonium acetate （ 1 mol · L^-1 ） into the soil sample （5 g）, then shake it for 30 min, the extracted solution is used for directly determination of the exchangeable cations by ICP-AES. By the method, the detection limit of Ca, Mg, K, Na, Mn respectively are 0. 003 6, 0. 006 9, 0. 033 6, 0. 001 43 and 0. 035 ug · mL^-1. After testing the national standard substance （GBW 07416） of soil available composition, the analytical results are nearly in accord with standard values. The RE（n = 11 ） of Ca, Mg, K, Mn are - 1.94%, 6.61%, -2.5%, -9.09% and 3.59% respectively, and the RSD of the determined elements as Ca, Mg, K, Na, Mn are 0.96%, 1.80%, 4.65%, 0.54%, 0.71% respectively.

关 键 词：电感耦合等离子发射光谱仪 土壤 交换性离子 标准物 

分 类 号：S714.5[农业科学—林学]