Effects of digestate DOM on chemical behavior of soil heavy metals in an abandoned copper mining areas.,Journal of Hazardous Materials

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Effects of digestate DOM on chemical behavior of soil heavy metals in an abandoned copper mining areas.
Journal of Hazardous Materials ( IF 12.2 ) Pub Date : 2020-03-02 , DOI: 10.1016/j.jhazmat.2020.122436
Xujing Guo ₁ , Xin Xie ₁ , Yudan Liu ₁ , Chun Wang ₁ , Meng Yang ₁ , Yang Huang ₁

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The influence of digestate dissolved organic matter (DOM) on chemical behavior of soil heavy metals (HMs) in an abandoned copper mining areas was explored by fluorescence quenching titration and heavy metal extracting experiment. Five fluorescent components were obtained from digestate DOM by PARAFAC model combined with the EEM data. The stability constant (log KM) values were in the range of 4.95-5.53, 5.05-5.29, 5.21-6.00, and 4.12-4.75 for DOM-Cr(III), DOM-Cu(II), DOM-Fe(III) and DOM-Pb(II) complexes, respectively. Alcohols, ethers and esters in digestate DOM were preferentially combined with Fe(III), Cu(II) and Zn(II). However, phenolic hydroxyl groups were more likely to combine with Cr(III) and Pb(II). The speciation distribution of HMs indicated that mining resulted in a higher concentration of Cu(II) in the grassland soil (GS) than those in the agricultural soil (AS) and forest land soil (FS). Fe-Mn oxides and organic forms of Pb(II) increased dramatically due to mining. Digestate DOM extraction can increase the content of Cr(III), Fe(III) and Pb(II), and decrease the content of Cu(II) and Zn(II) in the AS, GS, and FS. However, the contents of HMs in the mining soil (MS) and slag soil (SS) decreased due to the application of digestate DOM, except for Cu(II) in the SS.

中文翻译：

消化DOM对废弃铜矿区土壤重金属化学行为的影响。

通过荧光猝灭滴定和重金属萃取实验，探讨了消化溶解有机物（DOM）对废弃铜矿区土壤重金属（HMs）化学行为的影响。通过PARAFAC模型结合EEM数据从消化的DOM中获得了五个荧光成分。对于DOM-Cr（III），DOM-Cu（II），DOM-Fe（III），稳定常数（log KM）值在4.95-5.53、5.05-5.29、5.21-6.00和4.12-4.75范围内和DOM-Pb（II）配合物。消化的DOM中的醇，醚和酯优先与Fe（III），Cu（II）和Zn（II）结合。但是，酚羟基更可能与Cr（III）和Pb（II）结合。HMs的物种分布表明，采矿导致草原土壤（GS）中的Cu（II）浓度高于农业土壤（AS）和林地土壤（FS）中的浓度。由于开采，铁锰氧化物和有机形式的铅（II）急剧增加。Digestate DOM提取可增加AS，GS和FS中Cr（III），Fe（III）和Pb（II）的含量，并降低Cu（II）和Zn（II）的含量。然而，由于消化性DOM的应用，矿质土壤（MS）和矿渣土壤（SS）中HMs的含量降低了，SS中的Cu（II）除外。和FS。然而，由于消化性DOM的应用，矿质土壤（MS）和矿渣土壤（SS）中HMs的含量降低了，SS中的Cu（II）除外。和FS。然而，由于消化性DOM的应用，矿质土壤（MS）和矿渣土壤（SS）中HMs的含量降低了，SS中的Cu（II）除外。

更新日期：2020-03-03

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