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Evaluation of NaOH leaching techniques to extract humic acids from palaeosols

文献类型：期刊论文

作者Head, MJ; Zhou, WJ
刊名NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
出版日期2000-10
卷号172页码:434-439
关键词humic acids soil chemistry palaeosols radiocarbon dating decarboxylation visible spectrometry
DOI10.1016/S0168-583X(00)00221-4
文献子类Article; Proceedings Paper
英文摘要It can be shown quite conclusively that the often used technique (AAA) of leaching palaeosol samples with hot or boiling dilute HCl solution, followed by treatment with up to 2% NaOH solution and a further treatment with dilute HCl solution may not remove all of the so-called humic acids from palaeosol samples. In fact, in many cases it does not remove any of the humic acids, only carbohydrates, amino acids and other organic compounds. This can be shown by examination of the visible spectrum (400-700 nm) of the "humic acid" extract in alkaline solution. Hence, many of the reported C-14 results from the "humin" fraction of palaeosols are actually from the humic acid fraction which is tightly bound to the clay component of the palaeosol. The NaOH leach also has the potential to introduce carboxylic acid groups from atmospheric CO2 into phenol groups. A reevaluation of humic acid extracts of palaeosols collected from the Loess Plateau in China has been made, with analyses comparing the properties of the various organic extracts. Also, an extraction technique based on recommendations from the International Humic Substances Society, incorporating removal of impurities by chromatography plus a decarboxylation step is proposed. (C) 2000 Elsevier Science B.V. All rights reserved.
学科主题Instruments & Instrumentation ; Nuclear Science & Technology ; Physics
WOS关键词C-14
WOS研究方向Instruments & Instrumentation ; Nuclear Science & Technology ; Physics, Atomic, Molecular & Chemical ; Physics, Nuclear
语种英语
WOS记录号WOS:000165231000075
出版者ELSEVIER SCIENCE BV
源URL[http://ir.ieecas.cn/handle/361006/12026]  
专题黄土与第四纪地质国家重点实验室（1985-2004）
推荐引用方式
GB/T 7714		 Head, MJ,Zhou, WJ. Evaluation of NaOH leaching techniques to extract humic acids from palaeosols[J]. NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS,2000,172:434-439.
APA Head, MJ,&Zhou, WJ.(2000).Evaluation of NaOH leaching techniques to extract humic acids from palaeosols.NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS,172,434-439.
MLA Head, MJ,et al."Evaluation of NaOH leaching techniques to extract humic acids from palaeosols".NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS 172(2000):434-439.

入库方式： OAI收割

来源：地球环境研究所

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