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Effects of Iron on Optical Properties of Dissolved Organic Matter

机译：铁对溶解有机物光学性质的影响

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摘要

Iron is a source of interference in the spectroscopic analysis of dissolved organic matter (DOM); however, its effects on commonly employed ultraviolet and visible (UV-vis) light adsorption and fluorescence measurements are poorly defined. Here, we describe the effects of iron(Ⅱ) and iron(Ⅲ) on the UV-vis absorption and fluorescence of solutions containing two DOM fractions and two surface water samples. In each case, regardless of DOM composition, UV-vis absorption increased linearly with increasing iron(Ⅲ). Correction factors were derived using iron(Ⅲ) absorption coefficients determined at wavelengths commonly used to characterize DOM. Iron(Ⅲ) addition increased specific UV absorbances (SUVA) and decreased the absorption ratios (E_2:E_3) and spectral slope ratios (S_R) of DOM samples. Both iron(Ⅱ) and iron(Ⅲ) quenched DOM fluorescence at pH 6.7. The degree and region of fluorescence quenching varied with the iron:DOC concentration ratio, DOM composition, and pH. Regions of the fluorescence spectra associated with greater DOM conjugation were more susceptible to iron quenching, and DOM fluorescence indices were sensitive to the presence of both forms of iron. Analyses of the excitation-emission matrices using a 7- and 13-component parallel factor analysis (PARAFAC) model showed low PARAFAC sensitivity to iron addition.
机译：铁是溶解有机物（DOM）光谱分析中的干扰源。但是，它对常用的紫外线和可见光（UV-vis）光吸收和荧光测量的影响尚不明确。在此，我们描述了铁（Ⅱ）和铁（Ⅲ）对含有两个DOM组分和两个地表水样品的溶液的紫外可见吸收和荧光的影响。在每种情况下，无论DOM成分如何，UV-vis吸收都随铁（Ⅲ）的增加线性增加。校正因子是使用铁（Ⅲ）吸收系数得出的，该吸收系数是在通常用于表征DOM的波长下确定的。铁（Ⅲ）的添加提高了DOM样品的比紫外吸收率（SUVA），降低了吸收率（E_2：E_3）和光谱斜率（S_R）。铁（Ⅱ）和铁（Ⅲ）均在pH 6.7下淬灭了DOM荧光。荧光猝灭的程度和区域随铁：DOC浓度比，DOM组成和pH值而变化。与更大的DOM共轭相关的荧光光谱区域更容易受到铁淬灭，并且DOM荧光指数对两种形式的铁的存在均敏感。使用7分量和13分量并行因子分析（PARAFAC）模型对激发-发射矩阵进行分析，发现PARAFAC对铁的敏感性较低。

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  • 来源
    《Environmental Science & Technology》 |2014年第17期|10098-10106|共9页
  • 作者

    Brett A. Poulin; Joseph N. Ryan; George R. Aiken;

  • 作者单位

    Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

    Department of Civil, Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, Colorado 80309, United States;

    United States Geological Survey, Boulder, Colorado 80303, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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  • 正文语种 eng
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