Elsevier

Environmental Pollution

Volume 238, July 2018, Pages 140-149
Environmental Pollution

Analysis of metal(loid)s contamination and their continuous input in soils around a zinc smelter: Development of methodology and a case study in South Korea

https://doi.org/10.1016/j.envpol.2018.03.020Get rights and content

Highlights

  • Several approaches were combined to identify metal(loid) contamination in soil.

  • As, Cd, Cu, Hg, Pb, and Zn in soils were derived from the Zn smelter.

  • As originated from multiple anthropogenic sources as well as from the Zn smelter.

  • Lithogenic Fe can be an indicator for continuous input of anthropogenic metals.

  • Soil contamination can be effectively investigated with our proposed approach.

Abstract

Soil contamination due to atmospheric deposition of metals originating from smelters is a global environmental problem. A common problem associated with this contamination is the discrimination between anthropic and natural contributions to soil metal concentrations: In this context, we investigated the characteristics of soil contamination in the surrounding area of a world class smelter. We attempted to combine several approaches in order to identify sources of metals in soils and to examine contamination characteristics, such as pollution level, range, and spatial distribution. Soil samples were collected at 100 sites during a field survey and total concentrations of As, Cd, Cr, Cu, Fe, Hg, Ni, Pb, and Zn were analyzed. We conducted a multivariate statistical analysis, and also examined the spatial distribution by 1) identifying the horizontal variation of metals according to particular wind directions and distance from the smelter and 2) drawing a distribution map by means of a GIS tool. As, Cd, Cu, Hg, Pb, and Zn in the soil were found to originate from smelter emissions, and As also originated from other sources such as abandoned mines and waste landfill. Among anthropogenic metals, the horizontal distribution of Cd, Hg, Pb, and Zn according to the downwind direction and distance from the smelter showed a typical feature of atmospheric deposition (regression model: y = y0 + αeβx). Lithogenic Fe was used as an indicator, and it revealed the continuous input and accumulation of these four elements in the surrounding soils. Our approach was effective in clearly identifying the sources of metals and analyzing their contamination characteristics. We believe this study will provide useful information to future studies on soil pollution by metals around smelters.

Introduction

A major anthropogenic source of trace metal pollution in the environment is the smelting of nonferrous metals (Li et al., 2011; Shen et al., 2017; Zhan et al., 2014). Ample evidence shows that atmospheric deposition of smelter emissions causes soil contamination (Tembo et al., 2006; Svendsen et al., 2007; Šajn et al., 2013; Zhan et al., 2014; Ghayoraneh and Qishlaqi, 2017; Shen et al., 2017), and high concentrations of metal(loid)s such as Cd, Cu, Hg, Pb, Zn, and As have been found in soils around smelters in various countries (Borgna et al., 2009; Stafilov et al., 2010; Li et al., 2011; Liu et al., 2013; Šajn et al., 2013) often at concentrations that are well above regulatory limits and therefore should in principle require some form of remediation.

It is generally not too difficult, via transect- or systematic sampling studies, to determine the concentration of metal(loid)s in soils at various distances from a given smelter facility, and to identify the region where this concentration pauses (eco)toxicological risks. Once the extent of this contaminated region is known, one can design an appropriate remediation strategy. This process has been carried out by various groups of researchers in different parts of the world, and in particular by Hong et al. (2009) a few years back for the Seokpo zinc smelter located in Bonghwa County, Gyeongbuk Province (South Korea). In the vicinity of the smelter, these authors focused on Cd and Zn pollution in the predominantly agricultural land; where nearby residents grow vegetables and fruit trees, to satisfy local consumption.

Once a strategy for remediation has been clearly identified, it would seem straightforward for local or government officials to turn to polluters to pay for clean-up costs. However, experience has shown time and again that it is relatively easy for those responsible for the pollution to deflect the charges by claiming that metal(loid) concentrations that are above regulatory standards in soils near smelter sites are due to natural background metal(loid)s concentrations in soils being high, not to actual pollution. Unfortunately, a clear methodology to assess the true extent of metal(loid)s pollution around smelter sites appears to be lacking at this point, making it very difficult for decision-makers to move forward.

In this context, a key objective of the research described in the present article was to return to the Seokpo zinc smelter site already analyzed by Hong et al. (2009), and to devise a method to tease apart metal(loid) pollution from background levels in soils in the vicinity of the smelter. To achieve this objective, several approaches were combined. The concentrations of metals in the soil were surveyed extensively through site investigation. Then, we conducted a multivariate statistical analysis and examined the spatial distribution by identifying the horizontal variation of metals according to particular wind directions and distance from the smelter and drawing a distribution map by means of a GIS tool.

Section snippets

Site description

Located in the village of Seokpo, in Bonghwa County, Gyeongbuk Province, Republic of Korea (Fig. 1), the Seokpo zinc smelter started operation in 1970 and is now one of the largest Zn producers in Asia. The annual production capacities of the smelter for zinc (zinc slab), sulfuric acid, copper sulfate, silver (by-product of smelting zinc ores), and indium are 350,000, 600,000, 1,500, 28,000, and 30 tons, respectively, according to its official website (www.ypzinc.co.kr).

The study site is within

General properties of the soil

The general properties of the soil are presented in Supplementary Table S2. The pH values ranged between 4.57 and 8.19 (mean pH 6.44) with a low coefficient of variation (CV; 13%), suggesting that most of the soil samples are slightly acidic. Park et al. (2016) reported that the mean pH value of upland soils in South Korea (Gyeongbuk Province) was 6.4 with a standard deviation (SD) of 0.8 (CV = 13%). The mean values of the particle size fractions of the soil samples are 54.9% sand, 31.8% silt,

Conclusion

Using the total concentrations of metal(loid)s in the soils of the study area, we conducted multivariate statistical analysis, examined the horizontal variation of the metal(loid)s according to wind directions and distance from the smelter, and analyzed the spatial distribution of the metal concentrations. The combination of these three approaches was effective in identifying the sources of metal(loid)s and analyzing their contamination characteristics. We also confirmed that lithogenic Fe is a

Acknowledgments

This work was carried out with the support of “Cooperative Research Program for Agriculture Science & Technology Development (Project No. PJ012654)” Rural Development Administration, Republic of Korea.

References (59)

  • A. Khalil et al.

    GIS-based environmental database for assessing the mine pollution: a case study of an abandoned mine site in Morocco

    J. Geochem. Explor.

    (2014)
  • R. Kumari

    Preliminary mercury emission estimates from non-ferrous metal smelting in India

    Atmos. Pollut. Res.

    (2011)
  • C.S. Lee et al.

    Metal contamination in urban, suburban, and country park soils of Hong Kong: a study based on GIS and multivariate statistics

    Sci. Total Environ.

    (2006)
  • P. Li et al.

    Contamination and health risks of soil heavy metals around a lead/zinc smelter in southwestern China

    Ecotoxicol. Environ. Saf.

    (2015)
  • X. Li et al.

    Chemical partitioning of trace and major elements in soils contaminated by mining and smelting activities

    Appl. Geochem.

    (2001)
  • Z. Li et al.

    Mercury and other metal and metalloid soil contamination near a Pb/Zn smelter in east Hunan province, China

    Appl. Geochem.

    (2011)
  • A. Liénard et al.

    Soil contamination near a former Zn–Pb ore-treatment plant: evaluation of deterministic factors and spatial structures at the landscape scale

    J. Geochem. Explor.

    (2014)
  • G. Liu et al.

    Heavy metal speciation and pollution of agricultural soils along Jishui River in non-ferrous metal area in Jianxi Province, China

    J. Geochem. Explor.

    (2013)
  • D.S. Manta et al.

    Heavy metals in urban soils: a case study from the city of Palermo (Sicily), Italy

    Sci. Total Environ.

    (2002)
  • A. Mihailović et al.

    Spatial distribution of metals in urban soil of Novi Sad, Serbia: GIS based approach

    J. Geochem. Explor.

    (2015)
  • J.A. Rodríguez et al.

    Multiscale analysis of heavy metal contents in Spanish agricultural topsoils

    Chemosphere

    (2008)
  • R. Šajn et al.

    Heavy metal contamination of topsoil around a lead and zinc smelter in Kosovska Mitrovica/Mitrovicë, Kosovo/Kosovë

    J. Geochem. Explor.

    (2013)
  • K.C. Schiff et al.

    Iron as a reference element for determining trace metal enrichment in Southern California coastal shelf sediments

    Mar. Environ. Res.

    (1999)
  • F. Shen et al.

    Spatial distribution and risk assessment of heavy metals in soil near a Pb/Zn smelter in Feng County, China

    Ecotoxicol. Environ. Saf.

    (2017)
  • B. Škrbić et al.

    Chemometric interpretation of heavy metal patterns in soils worldwide

    Chemosphere

    (2010)
  • T. Stafilov et al.

    Heavy metal contamination of topsoils around a lead and zinc smelter in the Republic of Macedonia

    J. Hazard. Mater.

    (2010)
  • Z. Szolnoki et al.

    Cumulative impacts of human activities on urban garden soils: origin and accumulation of metals

    Environ. Pollut.

    (2013)
  • B.D. Tembo et al.

    Distribution of copper, lead, cadmium, and zinc concentrations in soils around Kabwe town in Zambia

    Chemosphere

    (2006)
  • S. Wu et al.

    Determining the anthropogenic contribution of heavy metal accumulations around a typical industrial town: Xushe, China

    J. Geochem. Explor.

    (2011)
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    This paper has been recommended for acceptance by Prof. W. Wen-Xiong.

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