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首页> 外文期刊>Journal of Environmental Science and Health. A, Toxic/Hazardous Substances & Environmental Engineering >Extraction of Heavy Metals from a Contaminated Soil Using Citrate-Enhancing Extraction by pH Control and Ultrasound Application
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Extraction of Heavy Metals from a Contaminated Soil Using Citrate-Enhancing Extraction by pH Control and Ultrasound Application

机译：pH控制和超声应用柠檬酸盐增强萃取法从污染土壤中萃取重金属

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摘要

A novel extraction method has been developed for remediation of a heavy-metal contaminated soil. Citrate was used a.s eiivironnienlally-IYiendly extractant to remove Pb, Zn, Cd, and Cu. Heavy metaks were extracted effectively at two different pH regions around 2 and 4-5. Kinetic study showed thai heavy metal extraction by washing at pH around 2 reached equilibrium within 4h, while extraction by washing al pH 4-5 increased gradually by the end of 24 h washing. Washing extraction at pH 2 for 6 h which was followed by washing at pH 5 lor 16 h increased the percentage extraction of Pb and Cu from 67.6 to 85.9% and from 77.5 to 83.4%, respectively. Ultrasound application has been also investigated to enhance extraction of heavy metals by using citrate. Only 3()min ultrasound application al 19.5 KHz attained higher extraction of heavy metals than those by washing for 24 h, showing the enhancement of heavy-metal removal. Thus, the performance of citrate for removing heavy metals was improved.
机译：已经开发出一种新的提取方法来修复重金属污染的土壤。柠檬酸用艾氏铁氰化钠萃取剂去除Pb，Zn，Cd和Cu。在2和4-5附近的两个不同的pH区域有效地提取了重金属。动力学研究表明，在pH值为2左右洗涤时，泰国重金属提取物在4h内达到平衡，而在pH值为4-5的洗涤条件下，提取物在24 h结束后逐渐增加。在pH 2下洗涤萃取6小时，然后在pH 5或洗涤16小时后，铅和铜的萃取百分比分别从67.6％增加到85.9％和从77.5％增加到83.4％。还研究了超声应用以通过使用柠檬酸盐增强重金属的提取。超声波在3分钟中，19.5 KHz的重金属提取率要高于洗涤24小时后的重金属提取率，这表明重金属去除率有所提高。因此，柠檬酸盐去除重金属的性能得到改善。

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