Spatial structure analysis and kriging of dichlorodiphenyltrichloroethane residues in topsoil from Tianjin, China

Li, B.G.; Ran, Yawei; Cao, Jianhua; Liu, W.X.; Shen, Weijian; Wang, X.J.; Coveney, Raymond M.; Tao, Shu

doi:10.1016/j.geoderma.2007.05.004

Cited by 11 publications

(7 citation statements)

References 28 publications

(51 reference statements)

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“…Semivariograms showed that lnCd and pH were all fitted for spherical model, whereas SOM was best fitted for an exponential model. Range value is a measure of extension where autocorrelation exists (Webster and Oliver, 1990;Li et al, 2007). The effective range of Cd was very close to that of pH, suggesting that they had similar spatial correlation structures and their distribution was affected by similar influence factors.…”

Section: Spatial Characteristics Of CD Ph and Som In Topsoilsmentioning

confidence: 83%

Spatial characteristics of cadmium in topsoils in a typical e-waste recycling area in southeast China and its potential threat to shallow groundwater

Luo

Deng

et al. 2014

Science of The Total Environment

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• We characterize the Cd total in topsoils, pH and SOM in a typical e-waste recycling area.• The relationships between Cd total in topsoils, pH, and SOM were studied.• Impact of topsoil Cd accumulation and acidification on shallow groundwater quality was evaluated. Informal electrical and electronic waste (e-waste) recycling often creates secondary sources of cadmium (Cd) pollution. To characterize the total Cd concentration (Cd total ) in topsoil and evaluate the threat of Cd in topsoils to shallow groundwater, 187 topsoil samples and 12 shallow groundwater samples were collected in a typical e-waste recycling area in southeast China. Soil organic matter content, soil pH and Cd total in topsoil, pH and dissolved Cd concentration in shallow groundwater were measured. Cd total in the topsoils showed an inverse distribution trend with soil pH in that high Cd concentrations (and low pH values) were found in the surrounding area of the metal recycling industrial park where there were many family-operated e-waste recycling facilities before the industrial park was established and with low concentrations (and high pH values) in other areas, and they had similar spatial correlation structures. Cd accumulation and acidification were synchronous in topsoils, and soil pH was significantly correlated with Cd total in topsoils with low to moderate negative correlation coefficient (r = −0.24), indicating that both of them maybe correlated with informal recycling. The shallow groundwater in the surrounding area of the metal recycling industrial park was seriously contaminated by Cd, and topsoil Cd accumulation and acidification in the surrounding area of e-waste recycling sites significantly increase the risk of shallow groundwater contaminated by Cd. Action is urgently required to control Cd accumulation and acidification by improving the recycling operations of e-wastes in order to reduce the risk of Cd leaching from topsoils and shallow groundwater contamination. a b s t r a c t a r t i c l e i n f o

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Section: Spatial Characteristics Of CD Ph and Som In Topsoilsmentioning

confidence: 83%

Spatial characteristics of cadmium in topsoils in a typical e-waste recycling area in southeast China and its potential threat to shallow groundwater

Luo

Deng

et al. 2014

Science of The Total Environment

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“…Range value is a measure of extension where autocorrelation exists (Li et al 2007; whereas the spatial correlation structures of the other elements had long ranges (16,500-60, 090 m). Short-range spatial correlation of Pb, suggesting the anthropogenic Fig.…”

Section: Geostatistical Analysismentioning

confidence: 99%

Heavy metal concentrations and their possible sources in paddy soils of a modern agricultural zone, southeastern China

Zhang²

2009

Environ Earth Sci

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In a typical modern agricultural Zone of southeastern China, Haining City, 224 topsoil samples were collected from paddy fields to measure the total concentrations of copper (Cu), lead (Pb), zinc (Zn), cadmium (Cd), chromium (Cr), mercury (Hg), arsenic (As) and cobalt (Co). The total concentrations ranged from 15.30 to 78.40 mg kg -1 for Cu, 20.10 to 41.40 mg kg -1 for Pb, 54.98 to 224.4 mg kg -1 for Zn, 0.04 to 0.24 mg kg -1 for Cd, 54.90 to 197.1 mg kg -1 for Cr, 0.03 to 0.61 mg kg -1 for Hg, 3.44 to 15.28 mg kg -1 for As, and 7.17 to 19.00 mg kg -1 for Co. Chemometric techniques and geostatistics were utilized to quantify their spatial characteristics and define their possible sources. All eight metals had a moderate spatial dependency except that Pb had a strong spatial dependency. Both factor analysis and cluster analysis successfully classified the eight metals into three groups or subgroups, the first group included Cu, Zn and Cr, the second group included Cd, As and Co, and the last group included Pb and Hg. The Cu, Zn and Cr concentrations in majority samples were higher than their local background concentrations and they were highly correlated (r [ 0.80), indicating that they had similar pollution source and anthropic factor controlled their spatial distribution; the Cd, As and Co concentrations in majority samples were lower than their local background concentrations, indicating that the source of these elements was mainly controlled by natural factors; the mean concentration of Pb exhibited generally low level, close to its local background concentration, the Hg concentration in about half of samples was higher than its local background concentration, and they were poor correlated with the other metals, indicating that the source of Pb and Hg was common controlled by natural factor and anthropic factor.

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“…This indicates that the Cr in ZJG topsoil, ZJG subsoil and CS topsoil had moderate spatial dependence and the Cr in CS subsoil had strong spatial dependence. Range is also one of the parameters used to describe the spatial structure of data and its value is a measure of extension where autocorrelation exists (Li et al 2007;Webster and Oliver 1990). The range values were: Cr in ZJG topsoil, 4560 m; Cr in ZJG subsoil, 10170 m; Cr in CS topsoil, 14520 m; and Cr in CS subsoil, 5640 m. Comparing the range of Cr at different soil depths, it was found that Cr in ZJG subsoil had longer effective range than Cr in ZJG topsoil, short-range spatial correlation of Cr in ZJG topsoil, suggesting that anthropogenic factors affect Cr distribution in ZJG topsoils.…”

Section: Discussionmentioning

confidence: 99%

Studies on the chromium concentrations in topsoils and subsoils of two rapidly industrialized cities in the Yangtze River Delta in east China

Luo

Huang

et al. 2010

Environ Earth Sci

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Spatial structure analysis and kriging of dichlorodiphenyltrichloroethane residues in topsoil from Tianjin, China

Cited by 11 publications

References 28 publications

Spatial characteristics of cadmium in topsoils in a typical e-waste recycling area in southeast China and its potential threat to shallow groundwater

Spatial characteristics of cadmium in topsoils in a typical e-waste recycling area in southeast China and its potential threat to shallow groundwater

Heavy metal concentrations and their possible sources in paddy soils of a modern agricultural zone, southeastern China

Studies on the chromium concentrations in topsoils and subsoils of two rapidly industrialized cities in the Yangtze River Delta in east China

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