改良的电感耦合等离子体发射光谱(ICP-OES)法测定石灰性土壤中交换性盐基钙、镁、钠、钾  

Determination of exchangeable base calcium, magnesium, sodiumand potassium in calcareous soil by modified inductivelycoupled plasma optical emission spectrometry

作　　者：张雅静[1] 卢禹含 聂喜涛 张佳楠[1] 张宇婷[1] ZHANG Yajing;LU Yuhan;NIE Xitao;ZHANG Jianan;ZHANG Yuting(College of Earth Sciences,Jilin University,Changchun 130061,China;Jilin Nonferrous Metals Geological Exploration Bureau Research Institute,Changchun 130012,China;School of Geomatics and Prospecting Engineering,Jilin Jianzhu University,Changchun 130119,China)

机构地区：[1]吉林大学地球科学学院,长春130061 [2]吉林省有色金属地质勘查局研究所,长春130012 [3]吉林建筑大学测绘与勘查工程学院,长春130119

出　　处：《世界地质》2024年第4期600-607,共8页World Geology

基　　金：国家重点研发项目(2023YFC2906903)。

摘　　要：为提升石灰性土壤中交换性盐基钙、镁、钠、钾的分析效率与精确度,笔者采用电感耦合等离子体发射光谱(ICP-OES)技术测定其含量。结果表明,最优条件为用70%乙醇溶液反复淋洗样品,再用pH值为8.5的0.1 mol/L的氯化铵-70%乙醇溶液进行交换处理,蒸干后加入10mL 20%~30%的硝酸溶液进行酸化处理。经此处理,把传统的单标溶液转变为混标配置,选择谱线分别为钙317.933 nm、镁279.553 nm、钠589.592 nm、钾766.491 nm,测得国标样品的加标回收率为98.0%~100.7%,检出限分别为0.008、0.005、0.004、0.007 mg/L。对两个国标样品GBW(E)070337、GBW(E)070341进行验证,测得的相对标准偏差(RSD)为0.29%~0.98%(n=5)。对吉林土壤(样品1)测得的结果与火焰光度计+原子吸收分光光度法测得的结果无显著性差异。结果表明该方法适用于石灰性土壤交换性盐基钙、镁、钠、钾的分析。To improve the analysis efficiency and accuracy of exchangeable base calcium,magnesium,sodium,potassium in calcareous soils,inductively coupled plasma optical emission spectrometry(ICP-OES)was used to determine their contents.The results showed that the optimal conditions were repeatedly washed with 70%ethanol solution,and then treated with the mixture of 0.1 mol/L ammonium chloride and 70%ethanol,8.5 in pH,several times for extraction.After drying,10 mL of 20%to 30%nitric acid solution was added for acidification.The solution preparation process was improved by replacing the traditional single standard solution with a mixed standard configuration.The selected spectral lines were calcium at 317.933 nm,magnesium at 279.553 nm,sodium at 589.592 nm,and potassium at 766.491 nm.The recovery rate of the standard samples was 98.0%-100.7%,and the detection limits were 0.008,0.005,0.004,and 0.007 mg/L,respectively.The relative standard deviation(RSD)was 0.29%-0.98%(n=5)for the two national standard samples GBW(E)070337 and GBW(E)070341.There was no significant difference between the measured results of the Jilin soil(sample 1)and those of the flame photometer and atomic absorption spectrophotometry.The results showed that this method is suitable for the analysis of exchangeable calcium,magnesium,sodium,and potassium in calcareous soils.

关 键 词：电感耦合等离子体发射光谱法 石灰性土壤 交换性钙、镁、钠、钾 

分 类 号：S151.9[农业科学—土壤学]