土壤铊(Tl)污染是一个严重的环境问题,和蔬菜是人类暴露于Tl的主要途径。因此,研究蔬菜对土壤Tl的吸收特征很重要。在这项研究中,元分析方法首次用于探索蔬菜中Tl含量与土壤环境之间的关系,以及影响土壤理化性质的关键因素,并得出Tl的土壤阈值。结果表明,不同类型的蔬菜具有不同的Tl积累能力。受污染地区的蔬菜表现出较高的Tl积累,不同类型蔬菜中的GeomeanTl含量顺序为:叶状>根茎>茄科蔬菜。在研究的35个物种中,芋和羽衣甘蓝具有明显更高的积累土壤Tl的能力,Tl生物富集因子值分别为0.060和0.133。Pearson相关分析和荟萃分析表明,蔬菜中的Tl含量与土壤pH和土壤中的Tl含量显着相关。基于土壤Tl含量的蔬菜中Tl积累的线性预测模型很好地描述了数据,拟合系数R2随土壤pH值的增大而增大。根据潜在的饮食毒性,推导出的所有土壤Tl阈值,叶类和根茎类蔬菜随着土壤pH值的增加而增加,并在1.46-6.72、1.74-5.26和0.92-6.06mg/kg的范围内,分别。羽衣甘蓝的土壤Tl阈值,生菜和胡萝卜在0.24-4.89、2.94-3.32和3.77-14.43mg/kg的范围内,分别。摄入羽衣甘蓝,甜菜,红薯,太郎,茄子和胡萝卜具有很高的潜在健康风险。该研究为Tl污染地区的蔬菜生产提供了科学指导,并有助于选择适合避免从污染土壤中吸收Tl的蔬菜品种。
Soil thallium (Tl) pollution is a serious environmental problem, and vegetables are the primary pathway for human exposure to Tl. Therefore, it is important to investigate the characteristics of soil Tl uptake by vegetables. In this study, the meta-analysis approach was first applied to explore the relationship between Tl content in vegetables and soil environment, as well as key factors influencing soil physical-chemical properties, and to derive soil thresholds for Tl. The results indicated that various types of vegetables have different capabilities for Tl accumulation. Vegetables from contaminated areas showed high Tl accumulation, and the geomean Tl content in different types of vegetables was in the following order: leafy > root-stalk > solanaceous vegetables. Taro and kale had significantly higher capability to accumulate soil Tl among the 35 species studied, with Tl bioconcentration factor values of 0.060 and 0.133, respectively. Pearson correlation analysis and meta-analysis revealed that the Tl content in vegetables was significantly correlated with soil pH and Tl content in soil. The linear predictive model for Tl accumulation in vegetables based on soil Tl content described the data well, and the fitting coefficient R2 increased with soil pH value. According to potential dietary toxicity, the derived soil Tl thresholds for all, leafy and root-stalk vegetables increased with an increase in soil pH, and were in the range of 1.46-6.72, 1.74-5.26 and 0.92-6.06 mg/kg, respectively. The soil Tl thresholds for kale, lettuce and carrot were in the range of 0.24-4.89, 2.94-3.32 and 3.77-14.43 mg/kg, respectively. Ingestion of kale, beet, sweet potato, potato, taro, pepper, turnip, Chinese cabbage, eggplant and carrot poses potential health risks. The study provides scientific guidance for vegetable production in Tl-contaminated areas and can help with the selection of vegetable species suitable for avoiding the absorption of Tl from contaminated soil.