Soil arsenic availability and the transfer of soil arsenic to crops in suburban areas in Fujian Province, southeast China.
The bioavailability, soil-to-plant transfer and associated health risks of arsenic in soils collected from paddy rice fields and vegetable fields in suburban areas of some major cities of Fujian Province were investigated. The total soil concentrations of arsenic ranged from 1.29 to 25.28 mg kg(-)(1) with a mean of 6.09 mg kg(-)(1). Available (NaH(2)PO(4)-extractable) arsenic content accounted for 0.7-38.2% of total soil arsenic and was significantly correlated with total soil arsenic content. For the vegetable soils, the available fraction (ratio of available As to total As) of arsenic decreased with decreasing silt (particle size 0.02-0.002 mm) and free iron (DCB extractable) contents and with increasing soil pH and organic matter content. The available fraction of arsenic in the paddy rice soils increased with increasing free iron and organic matter contents and decreasing soil pH and silt content. The correlation of NaH(2)PO(4)-extractable arsenic with the arsenic concentration of the vegetables was much better than that of total As. The transfer factor based on the soil available arsenic (TF(avail)) was chosen to compare the accumulation ability of the various crops. The TF(avail) values of rice grains (air-dried weight basis) ranged between 0.068 and 0.44 and were higher than those of the vegetables, ranging from 0.001 to 0.12. The accumulation ability of the crops decreased in the order of rice>radish>water spinach>celery>onion>taro>leaf mustard>fragrant-flowered garlic>pakchoi>Chinese cabbage>lettuce>garlic>cowpea>cauliflower>bottle gourd>towel gourd>eggplant. Daily consumption of rice and other As-rich vegetables could result in an excessive intake of arsenic, based on the provisional tolerable intake for adults for arsenic recommended by WHO.
Huang
Rui-Qing
RQ
Department of Resources and Environmental Sciences, Fujian Agriculture and Forestry University, Fuzhou 350002, P.R. China.
Gao
Shu-Fang
SF
Wang
Wei-Ling
WL
Staunton
S
S
Wang
Guo
G
D001151:Arsenic / Q000032:analysis* / Q000378:metabolism; D002681:China; D018556:Crops, Agricultural / Q000737:chemistry* / Q000378:metabolism; D004784:Environmental Monitoring; D005506:Food Contamination; D006801:Humans; D012275:Oryza / Q000737:chemistry* / Q000378:metabolism; D018570:Risk Assessment; D012989:Soil Pollutants / Q000032:analysis* / Q000378:metabolism; D014675:Vegetables / Q000737:chemistry* / Q000378:metabolism
D012989:Soil Pollutants; D001151:Arsenic