| 基于元素分析仪测定土壤有机碳的不同前处理方法对比研究 |
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| 引用本文： | 闵秀云,武君,高春亮,徐黎明,李雷明,王枫.基于元素分析仪测定土壤有机碳的不同前处理方法对比研究[J].盐湖研究,2020,28(4):64-70. |
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| 作者姓名： | 闵秀云 武君 高春亮 徐黎明 李雷明 王枫 |
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| 作者单位： | 中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,青海 西宁 810008;青海省盐湖地质与环境重点实验室,青海 西宁 810008;中国科学院大学,北京 100049 |
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| 基金项目： | 青海省“高端创新人才千人计划”(培养拔尖人才)项目;青海省应用基础研究项目(2016-ZJ-755);中国科学院西部之光“B”类项目及中国科学院功能开发项目 |
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| 摘 要： | 采用元素分析仪测定土壤标准样品中的有机碳含量,对比了银杯法、离心法和过滤法3种不同的前处理方法对测定结果的影响。以N-甲基邻苯二甲酰亚胺为加标物质,按3个不同水平加入到土壤标准样品中,开展了加标回收实验。研究结果表明,采用3种不同方法处理土壤标准物质后,其有机碳测试结果的相对标准偏差均小于9%,说明3种前处理方法均适用于土壤有机碳含量的测试。其中,离心法和过滤法的相对偏差均小于4%,其准确度和重现性优于银杯法,测试结果也更接近土壤有机碳含量真实值。离心法和过滤法的加标回收率分别为79.97%~102.09%和79.56~101.42%,明显高于银杯法的加标回收率(43.14%~69.10%)。研究结果表明,基于元素分析仪测定土壤有机碳的3种前处理方法中,过滤法最为准确和可靠。
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| 关 键 词： | 元素分析仪 土壤有机碳 银杯法 离心法 过滤法 |
| 收稿时间： | 2018/8/14 0:00:00 |
| 修稿时间： | 2018/8/22 0:00:00 |
The Comparative Study on Different Pretreatment Methods of Soil Organic Carbon Determined by Elemental Analyzer |
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| MIN Xiu-yun,WU Jun,GAO Chun-liang,XU Li-ming,LI Lei-ming,WANG Feng.The Comparative Study on Different Pretreatment Methods of Soil Organic Carbon Determined by Elemental Analyzer[J].Journal of Salt Lake Research,2020,28(4):64-70. |
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| Authors: | MIN Xiu-yun WU Jun GAO Chun-liang XU Li-ming LI Lei-ming WANG Feng |
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| Institution: | Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China;Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lakes,Xining,810008,China;University of Chinese Academy of Sciences,Beijing,100049,China |
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| Abstract: | This study compared the effects of three pretreatment approaches including silver cup method,centrifugation method,and filtration method on contents of organic carbon in standard soil samples determined by elemental analyzer.Recovery experiments were performed by adding N-Methylphthalimide to the soil samples with three addition levels.The results showed that all the RSD(relative standard deviation) values of organic carbon contents in soil standard substance determined by elemental analyzer with three pretreatment methods were lesser than 9%,indicating that these pretreatment methods could be suitable for determining the contents of soil organic carbon.The RSD values of soil organic carbon contents determined by elemental analyzer with centrifugation and filtration pretreatment methods were lesser than 4%.Compared with silver cup method,contents of soil organic carbon determined by elemental analyzer with centrifugation and filtration pretreatments were closer to the real contents.These results suggested that centrifugation and filtration pretreatment methods were better than silver cup method in accuracy and reproducibility.Recoveries of centrifuge method,filtration method,and silver cup method were in the ranges of 79.97%-102.09%,79.56%-101.42% and 43.14%-69.10%,respectively.Filtration method is the most accurate and reliable pretreatment for determining organic carbon contents in soil by elemental analyzer. |
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