Bioavailability and soil-to-crop transfer of heavy metals in farmland soils: A case study in the Pearl River Delta, South China

Zhang, Jingru; Li, Huizhen; Zhou, Yongzhang; Dou, Lei; Cai, Li‐Xuan; Mo, Liping; You, Jing

doi:10.1016/j.envpol.2017.12.106

Cited by 257 publications

(102 citation statements)

References 32 publications

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“…The high coefficient of variation of K and Zn indicated that anthropogenic activities have great affect on these parameters. The human activities such as smelting and industrial discharge affected the Zn content (Singh & Kumar, 2017 (Zhang et al 2018). The Co-efficient of variation (CV) of Fe and Cu was found low and belong to low spatial unevenness grade.…”

Section: Resultsmentioning

confidence: 99%

“…PCA was implemented to assess the contamination sources in agricultural soils of Northeastern Iran. It was employed by using varimax rotation with Kaiser Normalization to assess the normalized data after evaluating the compatibility of datasets for PCA factors by employing SPSS v. 16 ([IBM, USA] software Zhang et al 2018). In NMDS, grade alterations among the sampling sites in multidimensional space are sustained in 2D or 3D space using correlation as similarity measure.…”

Section: Discussionmentioning

confidence: 99%

“…The content of heavy metals in the agricultural soils is a matter of great apprehension due to their accumulative and nondegradable characteristics (Facchinelli, Sacchi, & Mallen, 2001). The pollution of heavy metals in agricultural soils was studied all over the world, including Iran, which is the main issue regarding the possibility of metal absorption by food Tian, Huang, Xing, & Hu, 2017;Zhang et al 2018).…”

Section: Introductionmentioning

confidence: 99%

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Spatial distribution and potential ecological risk assessment of heavy metals in agricultural soils of Northeastern Iran

Keshavarzi

Kumar

2019

Geology, Ecology, and Landscapes

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Illustrating the spatial distribution and potential sources of soil properties, and heavy metals, viz., Fe, Zn, Mn, and Cu, are the vital prerequisites for decreasing their pollution. The 68 composite agricultural soil samples in triplicates were collected by employing grid method to evaluate the concentration of pH, sand, silt, clay, organic carbon, P, K, and heavy metals. Multivariate techniques (Pearson's correlation, heatmap, principal component analysis, and nonmetric multidimensional scaling), geostatistcal techniques, and contamination indices were employed. The contents of Fe, Zn, Mn, and Cu were lower than the limits for Iran EPA guidelines and Earth's crust. The results of contamination factor and potential ecological risk index (RI) showed that agricultural soils have less contamination and low ecological risks. The enrichment factor (EF), geoaccumulation index (Igeo) and modified ecological risk index (MRI) indicated that 99%, 86.7% and 52.4% agricultural soil samples showed very high enrichment and ecological risks of heavy metals. Both anthropogenic activities and natural factors were responsible for heavy metal contents. The results of geostatistcal analysis revealed that Zn is accumulated more in Central regions, whereas Cu and Mn accumulated more in South and Northeastern regions of the studied area for EF, Igeo, and modified potential ecological RI. ARTICLE HISTORY

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial distribution and potential ecological risk assessment of heavy metals in agricultural soils of Northeastern Iran

Keshavarzi

Kumar

2019

Geology, Ecology, and Landscapes

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“…There are few heavy metals which are necessary for plants in trace amounts but can become hazardous if used in slightly greater amounts than the required concentration. 10 These heavy metals are a potential threat to living organisms on account of their extensive use and their toxic nature in combined or elemental forms. 11 Some heavy metals have a strong affinity for sulfur when bind via thiol group (-SH) in the body of human beings.…”

Section: Heavy Metals In Biological Systemsmentioning

confidence: 99%

Heavy metal pollution – A mini review

Hadia-e-Fatima¹,

Ahmed²

2018

JBMOA

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Soil contamination due to human oriented activities is an emerging issue in the present world. There are several pollutants from different industries which are released in the nearby soils. Among these pollutants, heavy metals constitute non-biodegradable, toxic and persistent pollutants which adversely affect ecological niche of all life forms, including humans. The detrimental effects of these heavy metals on living organisms are attributable to a number of cellular and biochemical processes in living organisms. In humans, these are known to cause various physiological disorders of respiratory, renal and gastrointestinal system. The biotoxicity of heavy metals depends on their concentration, chemical forms and bioavailability.

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“…Previous studies have reached a consensus that fraction distribution, rather than total concentration, is the governing factor for plant uptake and bioaccumulation of PTMs [13][14][15]. Conceptually, PTMs in soil are usually bound to organic and inorganic solid components by various processes, and thus with different phytoavailability [13,16,17].…”

Section: Introductionmentioning

confidence: 99%

Distribution of Cd and Cu Fractions in Chinese Soils and Their Relationships with Soil pH: A Meta-Analysis

Ning

Zhang

et al. 2019

Sustainability

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Soil contamination by potentially toxic metals (PTMs) has become a public concern in China. However, the distribution and controlling factors of soil PTM fractions remain largely unknown, limiting our ability to assess their health risks and thus to make sound controlling polices. Here, we investigate the fraction distribution of cadmium (Cd) and copper (Cu) in Chinese soils and their relationships with soil pH, based on a national meta-analysis of 163 published literatures. Exchangeable Cd in southern China accounted for 19.50 ± 14.97% of total Cd, significantly (p < 0.01) higher than the corresponding 13.42 ± 6.95% in northern China. Potentially available fractions constituted about 60% of total Cd at the national scale. By contrast, about half of soil Cu existed in unavailable residual fraction. Phytoavailable (i.e., exchangeable) fraction accounted for only 2.71 ± 1.65% and 2.54 ± 1.58% of total Cu in northern and southern China, respectively. Percentages of exchangeable Cd and Cu were negatively correlated (p < 0.01) with soil pH, while potentially available fractions increased significantly (p < 0.05) with soil pH. Our results provide the first national assessment of Cd and Cu fraction distribution and their responses to soil pH variations, highlighting the necessity to consider their fraction distribution and soil properties when assessing the health risks of soil PTM contamination in China.

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Bioavailability and soil-to-crop transfer of heavy metals in farmland soils: A case study in the Pearl River Delta, South China

Cited by 257 publications

References 32 publications

Spatial distribution and potential ecological risk assessment of heavy metals in agricultural soils of Northeastern Iran

Spatial distribution and potential ecological risk assessment of heavy metals in agricultural soils of Northeastern Iran

Heavy metal pollution – A mini review

Distribution of Cd and Cu Fractions in Chinese Soils and Their Relationships with Soil pH: A Meta-Analysis

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