Effects of inorganic anions on carbon isotope fractionation during Fenton-like degradation of trichloroethene
Effects of inorganic anions on carbon isotope fractionation during Fenton-like degradation of trichloroethene
复制标题
无机阴离子对三氯乙烯芬顿降解过程中碳同位素分馏的影响
DOI：
10.1016/j.jhazmat.2016.01.044
复制
发表时间：
2016
影响因子：
13.6
通讯作者：
Li Xiaoqian
中科院分区：
文献类型：
--
作者：
Liu Yunde;Zhou Aiguo;Gan Yiqun;Li Xiaoqian
了解特定过程中同位素分馏的幅度和变异性对于应用稳定同位素分析作为推断和量化转化过程的工具至关重要。研究了在不同无机离子（硝酸盐、硫酸盐和氯化物）存在下三氯乙烯（TCE）类芬顿降解过程中碳同位素分馏的变化，以评估无机阴离子对碳同位素富集因子（ε值）的潜在影响。比较去离子水、硝酸盐溶液和硫酸盐溶液中获得的ε值表明，ε值是相同的并且不受硝酸盐和硫酸盐存在的影响。然而，在氯化物存在的情况下，ε值（范围从-6.3±0.8到10±1.3‰）是可变的，并且取决于氯化物浓度，表明氯化物可以显着影响TCE类芬顿降解过程中的碳同位素分馏。因此，在稳定同位素分析的现场应用中应谨慎选择合适的ε值，因为在类芬顿修复过程中自然存在或通过pH调节和铁盐引入，可能会出现各种氯化物浓度。此外，氯化物对碳同位素分馏的影响可能能够为类芬顿过程的反应机制提供新的见解。
Understanding the magnitude and variability in isotope fractionation with respect to specific processes is crucial to the application of stable isotopic analysis as a tool to infer and quantify transformation processes. The variability of carbon isotope fractionation during Fenton-like degradation of trichloroethene (TCE) in the presence of different inorganic ions (nitrate, sulfate, and chloride), was investigated to evaluate the potential effects of inorganic anions on carbon isotope enrichment factor (εvalue). A comparison ofεvalues obtained in deionized water, nitrate solution, and sulfate solution demonstrated that theεvalues were identical and not affected by the presence of nitrate and sulfate. In the presence of chloride, however, theεvalues (ranging from −6.3 ± 0.8 to 10 ± 1.3‰) were variable and depended on the chloride concentration, indicating that chloride could significantly affect carbon isotope fractionation during Fenton-like degradation of TCE. Thus, caution should be exercised in selecting appropriateεvalues for the field application of stable isotope analysis, as various chloride concentrations may be present due to naturally present or introduced with pH adjustment and iron salts during Fenton-like remediation. Furthermore, the effects of chloride on carbon isotope fractionation may be able to provide new insights about reaction mechanisms of Fenton-like processes.