滇东镉高背景区菜地土壤健康风险评价与基准

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Abstract This paper studied accumulation characteristics and health risk status of cadmium (Cd) in the soil and different vegetables in soil-vegetable systems in east Yunnan, China, a high Cd background area, with samples collected through the point-to-point collaborative sampling method. The cadmium health risk benchmark of vegetable soil was also derived with species sensitivity distribution curve (SSD) method. There were 60.3% of the sampling sites for the cadmium accumulation in the soil of vegetable fields exceeded the soil screening value, and higher average values of soil Cd mass fraction were found in Qujing prefecture. The adsorption and accumulation abilities of Cd were found to vary by types of vegetables. Leafy vegetables and rhizome vegetables had strong abilities to absorb and enrich Cd, and the percentage of exceeding standards was relatively high. Among 23kinds of vegetables collected in the study area, there were 11kinds of vegetables which exceeded the Cd standard, the total percentage of vegetable samples exceeding the standard was 18%. The health risk assessment showed that there were no non-cancer risk for both the adults and children, the risk levels for three vegetables were leafy vegetables > rhizomes > solanaceous fruits. Cd in the vegetables had no health risk for adults and children in the study area, although the exposure risk for children was higher than that for adults; Based on the principle of protecting 95% and 5% vegetable varieties, the vegetable health risk criteria were developed for various vegetables. When planting root vegetables, HC₅=0.35mg/kg, HC₉₅=2.8mg/kg; When planting pepper vegetables, HC₅=0.15mg/kg, HC₉₅=8.7mg/kg; when planting leafy vegetables, HC₅=0.36mg/kg, HC₉₅=13.8mg/kg.

Key words： environmental background value cadmium health risk species sensitivity distribution

Received: 14 February 2020

PACS:

X820.4

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	LI Yang
	ZHANG Nai-ming
	WEI Fu-sheng

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LI Yang,ZHANG Nai-ming,WEI Fu-sheng. A benchmark study on soil health risks of vegetable fields in a high-cadmium background area in eastern Yunnan[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(10): 4522-4530.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I10/4522

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