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振荡抽滤-pH计指示电位滴定法快速测定土壤样品中阳离子交换总量
李光一, 任晓荣, 周彧琛, 张飞鸽, 曲少鹏
(湖北省地质实验测试中心)
Rapid Determination of Total Cation Exchange in Soil Samples by Oscillating Suction Filtration-pH Meter Potentiometric Titration
Li Guang Yi, Ren Xiao Rong, Zhou Yu Chen, Zhang Fei Ge, Qu Shao Peng
(Hu Bei Geological Research Laboratory)
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投稿时间:2020-07-14    修订日期:2020-08-05
中文摘要: 为了提高土壤中阳离子交换量(CEC)分析效率及分析准确度,本文采用乙酸铵或氯化铵-乙酸铵溶液对土壤样品进行处理,并采用振荡交换、抽滤分离的方式进行离子交换、铵离子清洗。土壤饱和吸附的铵离子用甲醛-CaCl2溶液交换后,采用氢氧化钠溶液滴定,并用pH计准确指示滴定终点,由此测定CEC含量。选用5个国家一级有效态标准物质进行验证,测定值与推荐值相符,相对偏差均小于7%。本方法提高了CEC的分析效率与准确度,更加适用于大批量样品的分析。
中文关键词: 土壤  阳离子交换量  振荡  抽滤  电位滴定
Abstract:In order to improve the efficiency and accuracy of cation exchange capacity (CEC) analysis in soil, this article uses ammonium acetate or ammonium chloride-ammonium acetate solution to treat soil samples, and then ion exchange and ammonium are carried out by shaking exchange and suction filtration separation. Ion cleaning. After the saturated ammonium ions in the soil were exchanged with formaldehyde-CaCl2 solution, it was titrated with sodium hydroxide solution, and the end point of the titration was accurately indicated with a pH meter, thereby determining the CEC content. Five national first-level effective reference materials were selected for verification. The measured values were in accordance with the recommended values, and the relative deviations were all less than 4%. This method improves the analysis efficiency and accuracy of CEC, and is more suitable for the analysis of large quantities of samples.
文章编号:20200714001     中图分类号:    文献标志码:
基金项目:湖北省地质局2019年度科技项目
引用文本:
李光一,任晓荣,周彧琛,张飞鸽,曲少鹏.振荡抽滤-pH计指示电位滴定法快速测定土壤样品中阳离子交换总量[J].中国无机分析化学,2021,(3):-.
Li Guang Yi,Ren Xiao Rong,Zhou Yu Chen,Zhang Fei Ge,Qu Shao Peng.Rapid Determination of Total Cation Exchange in Soil Samples by Oscillating Suction Filtration-pH Meter Potentiometric Titration[J].Chinese Journal of Inorganic Analytical Chemistry,2021,(3):-.

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