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首页> 外文期刊>Journal of the Brazilian Chemical Society >A structural conformation study of aquatic humic acid
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A structural conformation study of aquatic humic acid

机译：水生腐殖酸的结构构象研究

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In the present work, aquatic humic substances (HS) were extracted by use of adsorbent XAD 8 and the acid humic fraction (AH) was separated throught acidification. After being purified by Hyphan resin and dialyze, the aquatic AH was characterized using Fourier-transform infrared spectroscopy and elemental analysis. The influence of the aquatic HA and electrolyte concentrations, pH and aquatic AH-metal complexation time on the conformation was investigated using UV/Vis spectroscopic studies, employing the equation suggested by Doty and Steiner. The results indicated that the acid humic flexible macromolecule assumes a condensed form at acid and alkaline pH. Other factors favoring condensed conformations are longer metal complexation time ("ageing") and higher aquatic AH and electrolyte concentrations. Thus considering the strong influence of the investigated parameters in the structural conformation of the humic macromolecule, we conclude that studies using UV/Vis spectroscopy to estimate the concentration, aromaticity, humification degree of the aquatic AH and so on, require rigorous control over the experimental conditions employed to provide a correct interpretation of the analytical results.
机译：在本工作中，通过使用吸附剂XAD 8提取了水生腐殖质（HS），并通过酸化分离了酸性腐殖质级分（AH）。经Hyphan树脂和透析液纯化后，使用傅立叶变换红外光谱和元素分析对水生AH进行表征。使用Doty和Steiner建议的方程，使用UV / Vis光谱研究研究了水生HA和电解质浓度，pH和水生AH-金属络合时间对构象的影响。结果表明，酸性腐殖质柔性大分子在酸性和碱性pH值下呈稠合形式。有利于缩合构象的其他因素是更长的金属络合时间（“老化”）和更高的水生AH和电解质浓度。因此，考虑到研究参数对腐殖质大分子结构构象的强烈影响，我们得出结论，使用UV / Vis光谱法估算水生AH的浓度，芳香性，腐殖度等的研究需要对实验进行严格控制。用于正确解释分析结果的条件。

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