从土壤和沉积物中提取碳酸盐成分:使用不同浸出酸的实验研究

IF 2.8 3区 农林科学 Q3 ENVIRONMENTAL SCIENCES
Yifu Xu, Yuanchuan Li, Ping Wang, Jiangshan Li
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引用次数: 0

摘要

目的 土壤和沉积物中的碳酸盐成分在研究地表过程和重建古气候方面起着至关重要的作用。从土壤和沉积物中提取碳酸盐成分通常使用不同类型的酸。本研究对六种具有不同地质背景和不同碳酸盐含量的标准土壤和沉积物样品进行了一系列条件浸出实验。结果结果表明,稀醋酸(HOAc,0.5 mol/L)比酸性溶液(HCl)和醋酸缓冲溶液(NaOAc-HOAc)更能促进碳酸盐矿物的完全溶解,避免粘土矿物的溶解。此外,还发现用中性醋酸铵缓冲溶液(NH4OAc)或氯化钾缓冲溶液(KCl)对样品进行预处理对于去除可交换成分是必要的。结论 用稀醋酸(HOAc,0.5 mol/L)萃取土壤和沉积物中的碳酸盐成分是可取的,而去除可交换成分的预处理对于碳酸盐含量低的样品是必不可少的。使用稀酸不溶部分的元素比率或土壤和沉积物中矿物的平均成分对硅酸盐成分的贡献进行单独校正更为合理。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

The extraction of carbonate components from soils and sediments: an experimental investigation by using different leaching acids

The extraction of carbonate components from soils and sediments: an experimental investigation by using different leaching acids

Purpose

Carbonate components in soils and sediments play a crucial role in the study of surface processes and the reconstruction of paleoclimates. The extraction of carbonate components from soils and sediments is often carried out using different types of acids. However, which reagents can effectively extract the carbonate components while minimizing the destruction of non-carbonate minerals in soils and sediments has not been fully explored yet.

Methods

The present study conducted a series of conditional leaching experiments on six standard soil and sediment samples with diverse geological backgrounds and varying carbonate contents.

Results

The results revealed that dilute acetic acid (HOAc, 0.5 mol/L) performed better than acid solution (HCl) and acetic acid buffer solution (NaOAc-HOAc) in promoting the complete dissolution of carbonate minerals and avoiding the dissolution of clay minerals. It was also observed that pre-treating the samples with neutral ammonium acetate buffer solution (NH4OAc) or potassium chloride buffer solution (KCl) was necessary to remove exchangeable components. The Mg/Ca ratios of the silicate components after leaching carbonate in the standard soil and sediment samples we used exhibited significant differences (ranging from 0.41 to 1.60).

Conclusion

The dilute acetic acid (HOAc, 0.5 mol/L) is advisable for the extraction of carbonate components from soils and sediments, and the pre-treatment of removing exchangeable components is essential for samples with low carbonate content. It is more reasonable to use the element ratios of the dilute acid insoluble fraction or the average compositions of minerals in soils and sediments for individual correction for the contribution of the silicate components.

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来源期刊
Journal of Soils and Sediments
Journal of Soils and Sediments 环境科学-土壤科学
CiteScore
7.00
自引率
5.60%
发文量
256
审稿时长
3.5 months
期刊介绍: The Journal of Soils and Sediments (JSS) is devoted to soils and sediments; it deals with contaminated, intact and disturbed soils and sediments. JSS explores both the common aspects and the differences between these two environmental compartments. Inter-linkages at the catchment scale and with the Earth’s system (inter-compartment) are an important topic in JSS. The range of research coverage includes the effects of disturbances and contamination; research, strategies and technologies for prediction, prevention, and protection; identification and characterization; treatment, remediation and reuse; risk assessment and management; creation and implementation of quality standards; international regulation and legislation.
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