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Enriched isotope tracing to reveal the fractionation and lability of legacy and newly introduced cadmium under different amendments
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-09-17 , DOI: 10.1016/j.jhazmat.2020.123975
Qiang Dong , Yanwei Liu , Guangliang Liu , Yingying Guo , Qingqing Yang , Jianbo Shi , Ligang Hu , Yong Liang , Yongguang Yin , Yong Cai , Guibin Jiang

The newly introduced Cd (CdN) has different environmental fates than legacy Cd (CdL) and how to distinguish them in soil under different amendments is crucial for understanding natural aging and engineered remediation of Cd pollution in soil. In this study, enriched stable isotope tracer (112Cd) was introduced to distinguish the fate of CdN and CdL in paddy soil under pH adjustment and quicklime, slaked lime, and biochar amendments. The behaviors of CdN and CdL were studied during 56 days of flooding incubation through overlying water analysis, sequential extraction fractionation and lability (exchangeable pool probed by 110Cd isotopic spike) assessment. The results showed that soil pH is the main driving factor controlling the partition of both CdN and CdL in overlying water. During the incubation, CdN transformed quickly from soluble fraction to residual fraction under all treatments. In addition, at the end of the incubation, CdN concentrations in residual fraction were much higher than that of CdL, suggesting a more thorough aging of CdN than CdL. The labile CdN (ECdN) under pH adjustment and biochar amendment decreased during incubation and ECdN% was essentially the same with that of ECdL% after 28 days, indicating the aging equilibrium of exchangeable pool of CdN.



中文翻译:

丰富的同位素示踪,揭示了在不同的修正下遗留的和新引入的镉的分离度和不稳定性

新引入的Cd(Cd N)与传统Cd(Cd L)具有不同的环境命运,如何在不同的修正条件下区分土壤中的镉对于理解自然老化和土壤中Cd污染的工程修复至关重要。在这项研究中,引入了富集的稳定同位素示踪剂(112 Cd)来区分在pH调节和生石灰,熟石灰和生物炭改良剂作用下水稻土中Cd N和Cd L的命运。通过上覆水分析,依序萃取分级分离和不稳定性(由110探测的可交换池)研究了水淹孵育56天中Cd N和Cd L的行为。镉同位素加标)评估。结果表明,土壤pH是控制上覆水中Cd N和Cd L分配的主要驱动因素。在温育期间,镉Ñ迅速转化从可溶级分以下所有的处理残余馏分。另外,在孵育结束时,残留部分中的Cd N浓度要比Cd L高得多,这表明Cd N的老化要比Cd L更彻底。在培养过程中,pH调节和生物炭修正下的不稳定Cd N(ECd N)降低,ECd N%与ECd基本相同28天后的L%,表明Cd N交换池的老化平衡。

更新日期:2020-09-18
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