桂林市菜地土壤和蔬菜铜含量及其健康风险

在桂林地区蔬菜和菜地土壤铜含量进行大规模调查基础上,评价其污染程度,并用THQ评估经食用蔬菜摄入铜的健康风险。结果显示,桂林地区菜地土壤铜含量范围、中值、算术均值和几何均值分别为11.69～348.8mg·kg-1和27.41、34.62、29.43mg·kg-1,与桂林市土壤背景值相比,桂林市菜地土壤铜没有明显的积累;桂林地区蔬菜铜含量范围和平均值分别为0.032～3.530mg·kg-1和0.324mg·kg-1,与其他城市蔬菜铜含量相比,桂林地区蔬菜铜含量处于较低水平,通过蔬菜摄入铜的健康风险小。蔬菜对铜的富集能力以辣椒最高,因而其抗污染能力较差,白菜、包菜和萝卜对铜的富集能力最低。

A Survey of Copper Concentrations in Vegetables and Soils in Guilin and the Potential Risks to Human Health

In order to assess the potential human health risk posed by elevated concentrations of copper in vegetables, a large scale survey of copper levels in soil and vegetables planted or sold in Guilin was conducted. One hundred and sixty soil samples were collected from fields used to grow vegetable plants. In addition, 566 fresh vegetable samples were obtained from vegetable production fields and vegetable stalls. Copper concentrations in soils ranged from 11.69 to 348.8 mg·kg-1, with median, arithmetic and geometric means of 27.41, 34.62 mg·kg-1 and 29.43 mg·kg-1, respectively. Compared with the background copper concentrations of soil from Guilin, there was no significant accumulation of copper in soil collected from vegetable plots. Copper concentrations in the edible plant portions was 0.032-3.530 mg·kg-1 fresh weight, with median and geometric means of 0.321 and 0.325 mg kg -1 fresh weight, respectively. In all of the samples and vegetable varieties, copper was less tban the tolerance limit of copper in foods of 100 mg.kg-1 fresh weight for pulse and 20 mg kg-1 for other vegetables. Compared with the copper concentrations of vegetables in other area, the copper concentrations of vegetables in Guilin at the lower level. The average ingegtion rate of copper from vegetables was 1.01 mgindividual d-1 for people of Guilin, and it＇s make up 5.6% of the quantity demanded（ 18 mg.imlividual 1.d-1） and 1.85% of No-Observed-Adverse Effect-Level（NOAEL）, Consllming vegetables with elevated copper concentrations may not pose a health risk to local residents.