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Leaching of cadmium, chromium, copper, lead, and zinc from two slag dumps with different environmental exposure periods under dynamic acidic condition
Zhisheng Jin; Taoze Liu; Yuangen Yang; Daniel Jackson
2014
Source PublicationEcotoxicology and Environmental Safety
Volume104Issue:1Pages:43-50
Abstract

Over the past few decades, zinc smelting activities in Guizhou, China have produced numerous slag dumps, which are often dispersed on roadsides and hill slopes throughout the region. During periods of acid rain, these exposed slags release heavy metals into surface water bodies. A column leaching study was designed to test the potential release of the heavy metals cadmium (Cd), chromium (Cr), copper (Cu), lead (Pb), and zinc (Zn) under simulated acid rain events. Two slags with varying environmental exposure periods were packed in columns and subjected to leaching solutions of pH 3.5, 5.5, or DI H2O at intervals of 1, 7, 14, 28, 56 d. Pulse concentrations of Cd in leachate were found above 5 mu g/L, Cr, Pb, and Zn > 10 mu g/L, whereas, Cu reached 10 mu g/L. After five leaching events, the leachability (percentage of cumulative heavy metal leached after five leaching events as in its respective total concentration in slags) of Cd was 0.05 percent and 0.035 percent from the old and young slag, respectively. Cr (0.035 percent and 0.05 percent) was greater than Cu (0.002 percent and 0.005 percent) and Zn (0.006 percent and 0.003 percent), while the lowest leachability was observed for Pb (0.0005 percent and 0.0002 percent) from the old and young slags, respectively. Reaction rates (release amount of heavy metals in certain period of leaching) of heavy metals in the leachates demonstrated the sequence of Zn > Cr > Cd, Cu > Pb. Leaching release of heavy metals was jointly affected by the pH of leaching solution and mineral composition of slags (including chemical forms of Cd, Cr, Cu, Pb, and Zn). Environmental exposure period of slags, resulting in the alteration of minerals, could affect the release process of heavy metals in leaching as well.

KeywordColumn Leaching Heavy Metals Mineral Composition Exposure Periods Of Slag
Subject Area矿床地球化学
Indexed BySCI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/5216
Collection矿床地球化学国家重点实验室_矿床地球化学国家重点实验室_期刊论文
Recommended Citation
GB/T 7714
Zhisheng Jin,Taoze Liu,Yuangen Yang,et al. Leaching of cadmium, chromium, copper, lead, and zinc from two slag dumps with different environmental exposure periods under dynamic acidic condition[J]. Ecotoxicology and Environmental Safety,2014,104(1):43-50.
APA Zhisheng Jin,Taoze Liu,Yuangen Yang,&Daniel Jackson.(2014).Leaching of cadmium, chromium, copper, lead, and zinc from two slag dumps with different environmental exposure periods under dynamic acidic condition.Ecotoxicology and Environmental Safety,104(1),43-50.
MLA Zhisheng Jin,et al."Leaching of cadmium, chromium, copper, lead, and zinc from two slag dumps with different environmental exposure periods under dynamic acidic condition".Ecotoxicology and Environmental Safety 104.1(2014):43-50.
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