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Sequential extraction procedures for the determination of phosphorus forms in sediment

机译：顺序萃取程序测定沉积物中磷的形态

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摘要

This article summarizes the main extraction methods for sedimentary phosphorus (P) determination. With sequential chemical extractions, P is supposed to be selectively removed from different compounds in the sediments. Extraction schemes using strong acids and alkaline solutions have been tested on different sediments and found not to extract well-defined fractions. In addition, several systematic errors in these schemes have been detected. Thus, these schemes have been modified and simplified accordingly. The Standards Measurements and Testing Program of the European Commission (SMT) method is a popular modification of these extraction schemes, as it is simple to handle, allows laboratories to achieve reproducible results and could provide a useful tool for routine use by water managers. The SEDEX (sequential extraction method) method, another popular modification, is widely applied in biogeochemical research as it can separate authigenic carbonate fluorapatite from fluorapatite. Other chemical extractions using chelating compounds have attempted to extract P bound with iron and calcium in sediments without disturbing clay-bound or organic P, the purpose being to determine the algal-available non-apatite, apatite and organic fractions of sediment P. All extraction procedures still yield operationally defined fractions and cannot be used for identification of discrete P compounds. Future modifications of the extraction scheme should aim to achieve better extraction efficiency and selectivity, simple handling techniques and methods that can prevent the extracted P from being re-adsorbed onto Fe(OOH) and CaCO3.
机译：本文概述了测定沉积磷（P）的主要提取方法。通过顺序的化学提取，应该从沉积物中的不同化合物中选择性去除P。使用强酸和碱性溶液的提取方案已在不同的沉积物上进行了测试，发现未提取明确定义的馏分。此外，已检测到这些方案中的一些系统错误。因此，这些方案已被相应地修改和简化。欧盟委员会（SMT）方法的标准测量和测试程序是对这些萃取方案的一种流行的修改，因为它易于处理，可以使实验室获得可重复的结果，并且可以为水管理人员的日常使用提供有用的工具。 SEDEX（顺序萃取法）是另一种流行的改进方法，因为它可以将自生的碳酸盐氟磷灰石与氟磷灰石分离，因此已广泛应用于生物地球化学研究。使用螯合化合物进行其他化学提取的尝试是，在不干扰黏土结合或有机P的情况下提取沉积物中与铁和钙结合的P，目的是确定藻类可用的磷灰石非磷灰石，磷灰石和有机物P。所有提取程序仍可产生可操作定义的馏分，不能用于鉴定离散的P化合物。提取方案的未来修改应旨在实现更好的提取效率和选择性，简单的处理技术和方法，以防止提取的P重新吸附到Fe（OOH）和CaCO3上。

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  • 来源
    《Limnology》 |2013年第2期|147-157|共11页
  • 作者

    Changyou Wang; Yong Zhang; Hongli Li; R. John Morrison;

  • 作者单位

    School of Marine Sciences Nanjing University of Information Science and Technology">(1);

    Key Laboratory of Coastal Zone Environmental Processes Yantai Institute of Coastal Zone Research Chinese Academy of Sciences">(2);

    School of Marine Sciences Nanjing University of Information Science and Technology">(1);

    School of Earth and Environmental Sciences University of Wollongong">(3);

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Phosphorus; Extraction; Sediment; Forms;

    机译：磷;萃取;沉淀;形式;

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