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首页> 外文期刊>Chemical speciation and bioavailability >The effect of two kinds of eluents on the speciation of Al, Mn, and Fe by size-exclusion chromatography of some Brazilian soil solutions
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The effect of two kinds of eluents on the speciation of Al, Mn, and Fe by size-exclusion chromatography of some Brazilian soil solutions

机译：两种洗脱液对巴西某些土壤溶液的尺寸排阻色谱法对铝，锰和铁形态的影响

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摘要

Size-exclusion chromatography is a powerful tool for distinguishing dissolved organic matter in relation to its molecular size. However, problems may arise in the choice of the most appropriate eluent composition, regarding the gel used. In the present work, soil solution samples from four Brazilian topsoils were analyzed by high-performance liquid chromatography (HPLC) using a size-exclusion polymer-based column (Superclex 75HR 10/30, Pharmacia). Water and 0.01mol L-1 NaCl were investigated as mobile phases. The analysis of the UV peak distribution as well as their corresponding Fe, Mn, and Al concentrations suggested that the salt solution should be preferred since it minimizes unwanted interactions between the sample and the support material. Fe, Mn, and Al speciation calculated by the Geochem-PC program involving the Mattigod and Sposito Mixed Model was compared with the Fe, Mn, and Al-organic complex concentrations determined by SEC-HPLC/GFAAS. No correlation was found for Mn and Fe. For Al a significant non-linear correlation was observed.
机译：尺寸排阻色谱法是区分溶解的有机物与其分子大小有关的有力工具。但是，关于所用凝胶，在选择最合适的洗脱液组合物时可能会出现问题。在本工作中，使用基于排阻聚合物的色谱柱（Superclex 75HR 10/30，Pharmacia）通过高效液相色谱（HPLC）分析了来自四种巴西表层土壤的土壤溶液样品。研究了水和0.01mol L-1 NaCl作为流动相。对UV峰分布及其相应的Fe，Mn和Al浓度的分析表明，应首选盐溶液，因为这样可以最大程度地减少样品与载体材料之间的不良相互作用。将通过涉及Mattigod和Sposito混合模型的Geochem-PC程序计算出的Fe，Mn和Al形态与通过SEC-HPLC / GFAAS测定的Fe，Mn和Al有机配合物浓度进行了比较。没有发现锰和铁的相关性。对于Al，观察到显着的非线性相关性。

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