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Isotopic Fingerprints of Iron-Cyanide Complexes in the Environment

机译:环境中铁氰化物配合物的同位素指纹图谱

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摘要

Tracing the origin of iron-cyanide complexes in the environment is important because these compounds are potentially toxic. We determined the stable isotopic compositions of cyanide-carbon (C_(CN)) and cyanide-nitrogen (N_(CN)) in 127 contaminated solids and 11 samples of contaminated groundwater from coal carbonization sites, blast furnace operations, and commercial cyanide applications. Coal-carbonization-related cyanides had unique high mean δ~(13)C_(CN) values of -10.5 ± 3.5‰ for the solids and -16.1 ± 1.2‰ for the groundwater samples, while the values for blast furnace sludge (-26.9 ± 1.5‰), commercial cyanides (-26.0 ± 3.0‰), and their corresponding groundwaters were significantly lower. Determination of δ~(13)C_(CN) is a promising tool for identifying the source of cyanide contamination. However, for coal carbonization sites, historical research into the manufacturing process is necessary because a nonconventional gas works site exhibited exceptionally low δ~(13)C_(CN) values of -22.7 ± 1.7‰. The δ~(15)N_(CN) values for samples related to coal carbonization and blast furnaces overlapped within a range of +0.1 to +10.3‰, but very high δ~(15)N_(CN) values seemed to be indicative for a cyanide source in the blast furnace. In contrast, commercial cyanides tend to have lower δ~(15)N_(CN) values of -5.6 to +1.9‰ in solids and -0.5 to +3.0‰ in the groundwater.
机译:追踪环境中氰化铁络合物的来源很重要,因为这些化合物可能具有毒性。我们确定了127种受污染的固体和11种来自煤炭碳化现场,高炉操作和商业氰化物应用的受污染地下水中的氰化物-碳(C_(CN))和氰化物-氮(N_(CN))的稳定同位素组成。与煤碳化有关的氰化物具有独特的高δ〜(13)C_(CN)平均值,对于固体为-10.5±3.5‰,对于地下水样品为-16.1±1.2‰,而对于高炉污泥则为(-26.9 ±1.5‰),商业氰化物(-26.0±3.0‰)及其相应的地下水明显降低。 δ〜(13)C_(CN)的测定是鉴定氰化物污染源的有前途的工具。但是,对于煤炭碳化场,必须对生产过程进行历史研究,因为非常规天然气厂场的δ〜(13)C_(CN)值极低,为-22.7±1.7‰。与煤碳化和高炉有关的样品的δ〜(15)N_(CN)值在+0.1至+ 10.3‰的范围内重叠,但是非常高的δ〜(15)N_(CN)值似乎表明高炉中的氰化物源。相比之下,商品氰化物的δ〜(15)N_(CN)值在固体中往往较低,在-5.6至+ 1.9‰,而在地下水中则较低,在-0.5至+ 3.0‰。

著录项

  • 来源
    《Environmental Science & Technology》 |2016年第14期|7382-7388|共7页
  • 作者单位

    Universitaet zu Koeln, Department Geowissenschaften, Bodengeographie/Bodenkunde, D-50923 Koeln, Germany;

    Aix-Marseille Universite, Laboratoire Chimie Environnement, UMR 7376-CNRS, Marseille, France;

  • 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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