Heavy metal accumulation from zinc smelters in a carbonate rock region in Hezhang County, Guizhou Province, China
Heavy metal accumulation from zinc smelters in a carbonate rock region in Hezhang County, Guizhou Province, China
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DOI：
10.1007/s11270-006-9121-2
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发表时间：
2006-07
期刊：
影响因子：
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通讯作者：
Yuan-gen Yang;Cong-Qiang Liu;Wu Pan;Guoping Zhang;Wei Zhu
中科院分区：
文献类型：
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作者：
Yuan-gen Yang;Cong-Qiang Liu;Wu Pan;Guoping Zhang;Wei Zhu
在这项研究中，四个网站（地点A、B、C和D，与锌冶炼的不同持续时间有关），即两个渣堆通过对贵州省赫章县B、C两个采样点（剖面1、剖面2）和A、D两个采样点的调查，发现3个采样点的Pb、Zn、Cd平均浓度分别为11，192（± 8，991）、20，100（± 8，9在炉渣剖面1（n=10）中分别检测到563（± 16，727）和137（±112）mg kg− 1，在炉渣剖面2（n=12）中分别检测到12，535（± 4，408）、26，189（± 6，209）和47.9（±30.1）mg kg− 1。两个曲线均具有高pH值（曲线1中为7.72 ± 0.37，曲线2中为8.33 ± 0.49）。此外，在站点D，土壤中的Pb、Zn和Cd含量（14，945（± 9，696）、17，059（± 12，534）和61.9（±33.6）mg kg−1）以及河流沉积物中的Pb、Zn和Cd含量（11，450（± 7，097）、20，768（± 11，404）和66.8（±25.5）mg kg−1）较高。确定每个研究地点的综合污染指数（CPI）确认所观察到的铅，锌和镉污染的人为来源。样品中交换态Pb和Zn的小部分（<3%）是用连续提取技术提取的。Pb、Zn和Cd总量的37.7%（±7.69%）、21.3%（±7.75%）和22.7%（±13.2%）与碳酸盐结合态有关。这表明与该地区碳酸盐基矿石有关的碱性pH值。此外，总金属含量与土壤铁含量呈正相关，显着。这主要是由于Pb、Zn、Cd与铁矿物在地表风化环境中的共沉淀作用，但由于pH环境的改变，如酸性作物根际环境或该地区的酸沉降，Pb、Zn、Cd的环境释放仍存在潜在的威胁。因此，建议立即采取补救措施，以尽量减少潜在风险。
In this study, four sites (Sites A, B, C and D, which were associated with varying durations of zinc smelting) namely two slag piles (Profile1, Profile 2) at Sites B and C and two water channels at Sites A and D in Hezhang County, Guizhou Province, Southwestern China, were investigated.Significantly elevated mean Pb, Zn and Cd concentrations, 11,192 (±8,991), 20,563 (±16,727) and 137 (±112) mg kg−1in slag Profile 1(n=10), and 12,535(±4,408), 26,189 (±6,209) and 47.9 (±30.1) mg kg−1in slag Profile 2 (n=12) were detected, respectively. Both profiles had high pH values (7.72 ± 0.37 in Profile 1 and 8.33 ± 0.49 in Profile 2). In addition, high mean Pb, Zn and Cd in soils (14,945 (±9,696), 17,059 (±12,534) and 61.9 (±33.6) mg kg−1) and in stream sediments (11,450 (±7,097), 20,768 (±11,404) and 66.8 (±25.5) mg kg−1) were found at Site D. A Composite Pollution Index (CPI) determined for each study Site confirms the anthropogenic origins of the observed Pb, Zn and Cd contamination. Small portions (<3% of the total) of exchangeable Pb and Zn fractions in samples were extracted by using a sequential extraction technique. In contrast, 37.7% (±7.69%), 21.3% (±7.75%) and 22.7% (±13.2%) of total Pb, Zn and Cd was associated with the carbonate bound fraction. This is indicative of the alkaline pH associated with the carbonate based-ores of this region. Further, total metal concentrations were positively and significantly correlated with soil Fe contents. This may in large part be due to the co-precipitation of Pb, Zn and Cd with Fe minerals in the surface weathering environment.However, a potential threat still exists with regards to the environment release of Pb, Zn and Cd as a result of an alteration of the pH environment, such as in the acidic rhizosphere environment of cultivated crops or acid deposition in this region. It is therefore suggested that immediate remediation measures are implemented to minimize potential risks.