Cadmium contamination in orchard soils and fruit trees and its potential health risk in Guangzhou, China.

This study examines cadmium (Cd) contamination in orchard soils and fruit trees in Guangzhou, China, and assesses its potential health risk. Soils and tissues samples of three species of fruit trees were collected from three orchards. The average soil Cd concentration was 1.27, 1.84 and 0.68 mg/kg in orchards I, II, and III, respectively. The carambola (Averrhoa carambola) accumulated exceptionally high concentrations of Cd (7.57, 10.84, 9.01 and 2.15 mg/kg dw in root, twig, leaf and fruit, respectively), being 6.0-24 times and 4.0-10 times the corresponding tissue Cd in the longan (Dimocarpus longan) and wampee (Clausena lansium), respectively. Furthermore, all Cd concentrations (0.04-0.25 mg Cd/kg fw) of the fruits exceeded the tolerance limit of cadmium in foods of PR China (0.03 mg/kg fw). Our results indicate that the carambola tree has high Cd accumulation capacity and might be a Cd accumulator; and its fruit, among the three species of fruits studied, also poses the highest potential health risk to local residents.

[1]  Chi Sun Poon,et al.  Heavy metal contamination of urban soils and street dusts in Hong Kong , 2001 .

[2]  L. Fang.  Pollution of heavy metals in the Pearl River Estuary and its assessment of potential ecological risk , 2002 .

[3]  P. Chamorro,et al.  Speciation of metals in sewage sludge for agricultural uses , 1998 .

[4]  O. Wai,et al.  Over one hundred years of trace metal fluxes in the sediments of the Pearl River Estuary, South China. , 2004, Environmental pollution.

[5]  B. J. Alloway,et al.  The origins of heavy metals in soils. , 1990 .

[6]  Teng En.  The composing characteristics of elements in coarse and fine particle in air of the four cities in China , 1999 .

[7]  H. Kay.  Environmental Health Criteria , 1980 .

[8]  Z. Nan,et al.  Accumulation of Cd and Pb in Spring Wheat (Triticum aestivum L.) Grown in Calcareous Soil Irrigated with Wastewater , 2001, Bulletin of Environmental Contamination and Toxicology.

[9]  Huxing,et al.  Impact of Urbanization on Shanghai＇s Soil Environmental Quality , 2004 .

[10]  Gianniantonio Petruzzelli,et al.  Recycling wastes in agriculture: heavy metal bioavailability , 1989 .

[11]  G. Cieslinski,et al.  Low-molecular-weight organic acids in rhizosphere soils of durum wheat and their effect on cadmium bioaccumulation , 1998, Plant and Soil.

[12]  T. Adhikari,et al.  Sorption characteristics of lead and cadmium in some soils of India , 2003 .

[13]  L. King,et al.  Soil Factors Affecting Plant Concentrations of Cadmium, Copper, and Zinc on Sludge‐Amended Soils , 1997 .

[14]  G. Muller.  INDEX OF GEOACCUMULATION IN SEDIMENTS OF THE RHINE RIVER , 1969 .

[15]  P. Hills,et al.  Assessment of alternative wastewater treatment approaches in guangzhou, china , 1999 .

[16]  Ramesh C. Gupta,et al.  CADMIUM UPTAKE BY RADISHES FROM SOIL CONTAMINATED WITH NICKEL-CADMIUM BATTERIES: TOXICITY AND SAFETY CONSIDERATIONS , 2002, Toxicology mechanisms and methods.

[17]  Yu-Jing Cui,et al.  Transfer of metals from soil to vegetables in an area near a smelter in Nanning, China. , 2004, Environment international.

[18]  Günter J K Komarnicki,et al.  Lead and cadmium in indoor air and the urban environment. , 2005, Environmental pollution.

[19]  Brett H. Robinson,et al.  Natural and induced cadmium-accumulation in poplar and willow: Implications for phytoremediation , 2000, Plant and Soil.

[20]  S. McGrath,et al.  A simplified method for the extraction of the metals Fe, Zn, Cu, Ni, Cd, Pb, Cr, Co, and Mn from soils and sewage sludges. , 1985 .

[21]  D. Lauria,et al.  Assessment of daily intake of trace elements due to consumption of foodstuffs by adult inhabitants of Rio de Janeiro city. , 2004, The Science of the total environment.

[22]  B. J. Alloway,et al.  Heavy metals in soils , 1990 .

[23]  J. Wong,et al.  Assessment of trace metal distribution and contamination in surface soils of Hong Kong. , 1997, Environmental pollution.

[24]  Yaocheng Fan,et al.  HEAVY METAL CONTAMINATION IN VEGETABLES AND THEIR CONTROL IN CHINA , 2000 .

[25]  P. Raspor,et al.  Uptake of chromium(III) and chromium(VI) compounds in the yeast cell structure , 2004, Biometals.

[26]  A. Bellanca,et al.  Heavy metals in urban soils: a case study from the city of Palermo (Sicily), Italy. , 2002, The Science of the total environment.

[27]  B. Singh,et al.  Plant uptake and DTPA-extractability of Cd, Cu, Ni and Zn in a Norwegian alum shale soil as affected by previous addition of dairy and pig manures and peat , 1998 .

[28]  F. Stagnitti,et al.  Cadmium Contamination of Soils of the Shenyang Zhangshi Irrigation Area, China: An Historical Perspective , 2004, Bulletin of environmental contamination and toxicology.

[29]  S. Dudka,et al.  Transfer of cadmium, lead, and zinc from industrially contaminated soil to crop plants: a field study. , 1996, Environmental pollution.

[30]  A. Karaca.  Effect of organic wastes on the extractability of cadmium, copper, nickel, and zinc in soil , 2004 .

[31]  M. Nordberg,et al.  Environmental epidemiological study and estimation of benchmark dose for renal dysfunction in a cadmium-polluted area in China , 2004, Biometals.

[32]  I. Thornton,et al.  Heavy metal distribution in sediment profiles of the Pearl River estuary, South China , 2000 .

[33]  Wang Qingren Y. Dong,et al.  Instances of Soil and Crop Heavy Metal Contamination in China , 2001 .

[34]  I. H. Rorison,et al.  Chemical Analysis of Ecological Materials. , 1974 .

[35]  S. Prakash,et al.  Cadmium mobilisation and plant availability – the impact of organic acids commonly exuded from roots , 2001, Plant and Soil.

[36]  A. Schaeffer,et al.  The influence of humic acids on the phytoextraction of cadmium from soil. , 2004, Chemosphere.

[37]  Zhang Ming.  Heavy Metals, Phosphorus and Some Other Elements in Urban Soils of Hangzhou City, China , 2004 .

[38]  Zhou Dong-mei,et al.  Effects of Organic Acids, o-Phenylenediamine and Pyrocatechol on Cadmium Adsorption and Desorption in Soil , 2003 .

[39]  Fahu Chen,et al.  Relations Between Soil Properties and Selected Heavy Metal Concentrations in Spring Wheat (Triticum aestivum L.) Grown in Contaminated Soils , 2002 .

[40]  W. Lindsay,et al.  Development of a DTPA soil test for zinc, iron, manganese and copper , 1978 .

[41]  C. Keller,et al.  Phytoextraction capacity of trees growing on a metal contaminated soil , 2003, Plant and Soil.

[42]  Mike J. McLaughlin,et al.  Metals and micronutrients – food safety issues , 1999 .

[43]  C. Tsadilas,et al.  Cadmium uptake by tobacco as affected by liming, N form, and year of cultivation. , 2005, Environmental pollution.

[44]  Joint Fao,et al.  Evaluation of certain food additives and contaminants. , 2007, World Health Organization technical report series.

[45]  O. Wai,et al.  Multivariate statistical study of heavy metal enrichment in sediments of the Pearl River Estuary. , 2003, Environmental pollution.

[46]  G. Gillman,et al.  Modification to the compulsive exchange method for measuring exchange characteristics of soils , 1986 .

[47]  S. Power,et al.  Effects of soil cadmium on Pinus sylvestris L. seedlings , 2003, Plant and Soil.