A new method to remove biogenic silica from lake sediments by chemical dissolution coupled with sonication

IF 1.7 3区 地球科学 Q4 ENVIRONMENTAL SCIENCES
Sida Fu, Jie Li, Patrick Rioual, Jingkang Wang, Luo Wang
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Abstract

The grain-size distribution of lake sediments is a crucial proxy for paleoclimate reconstruction, as it is closely related to the transport dynamics of clastic materials from the surrounding land. However, the presence of biogenic silica, particularly remains of diatom frustules, can significantly bias the grain-size distribution of lake-sediment samples. To remove this component, an alkaline solution, usually consisting of sodium carbonate, is commonly used during sample preparation. However, the efficiency of this method has not been fully verified under the microscope and with statistical tests. This study aims to assess the efficiency of removing diatoms from sediment samples under different concentrations and treatment durations of Na2CO3 solution, and with and without sonication. The removal efficiency was assessed using microscope examination. Two sets of sediment samples from Huguang Maar Lake with high contents of diatoms but different species compositions were used. Results show that increasing sodium carbonate concentration and treatment duration improved the removal efficiency. A treatment with 2 mol L−1 Na2CO3 solution coupled with ultrasound vibrations for 4 h was found to be the most effective method for removing biogenic silica from the lake-sediment samples that were investigated. Differences in the removal efficiency between the two samples might be due to the different dominant diatom species in the samples. The new method provides a more reliable and effective procedure for removing diatoms from lake-sediment samples.

Abstract Image

化学溶解-超声耦合去除湖泊沉积物中生物源二氧化硅的新方法
湖泊沉积物粒度分布与周围陆地碎屑物质的输运动力学密切相关,是古气候重建的重要指标。然而,生物成因二氧化硅的存在,特别是硅藻体残骸的存在,会显著影响湖泊沉积物样品的粒度分布。为了去除这种成分,通常在样品制备过程中使用由碳酸钠组成的碱性溶液。然而,这种方法的有效性还没有在显微镜下和统计检验下得到充分的验证。本研究旨在评估不同浓度、不同处理时间的Na2CO3溶液、超声和不超声对沉积物样品中硅藻的去除效果。显微镜下观察其去除效果。利用湖广麻珥湖两组硅藻含量高但种类组成不同的沉积物样品。结果表明,增加碳酸钠浓度和处理时间可提高脱除效果。2 mol L−1 Na2CO3溶液加超声振动处理4 h是去除湖泊沉积物中生物源二氧化硅最有效的方法。两种样品去除率的差异可能是由于样品中优势硅藻种类不同所致。新方法为去除湖泊沉积物样品中的硅藻提供了一种更可靠、更有效的方法。
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来源期刊
Journal of Paleolimnology
Journal of Paleolimnology 地学-地球科学综合
CiteScore
3.70
自引率
9.50%
发文量
44
审稿时长
3 months
期刊介绍: The realization that a historical perspective is often useful, if not essential, to the understanding of most limnological processes has resulted in the recent surge of interest in paleolimnology. The main aim of the Journal of Paleolimnology is the provision of a vehicle for the rapid dissemination of original scientific work dealing with the reconstruction of lake histories. Although the majority of papers deal with lakes, paleoenvironmental studies of river, wetland, peatland and estuary systems are also eligible for publication. The Journal of Paleolimnology, like the subject itself, is multidisciplinary in nature, and papers are published that are concerned with all aspects (e.g. biological, chemical, physical, geological, etc.) of the reconstruction and interpretation of lake histories. Both applied and more theoretical papers are equally encouraged. The Journal of Paleolimnology will continue to be a major repository for papers dealing with climatic change, as well as other pressing topics, such as global environmental change, lake acidification, eutrophication, long-term monitoring, and other aspects of lake ontogeny. Taxonomic and methodological papers are also acceptable provided they are of relatively broad interest. New equipment designs are frequently featured. In addition to original data and ideas, the Journal of Paleolimnology also publishes review articles, commentaries and program announcements. A relevant Book Review Section is also featured.
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