Jiangsu Key Laboratory for Organic Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Jiangsu Key Laboratory for Organic Waste Utilization, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China.
Sci Total Environ. 2018 Oct 15;639:271-277. doi: 10.1016/j.scitotenv.2018.05.050. Epub 2018 May 20.
Soil contamination in some areas of southern China has resulted in elevated dietary intake of cadmium (Cd), posing a potential risk to human health. A survey of paired soil-rice (n = 200) and soil-vegetable (n = 142) samples was conducted in Xiangtan county of Hunan province, southern China. The concentrations of Cd in all the samples were determined by inductively coupled plasma mass spectrometry. Dietary intakes of Cd from the consumption of locally produced rice and vegetables were estimated for different age groups. Among the 342 crop samples collected in the survey, 88% and 29% of rice grain and vegetable samples, respectively, exceeded the Chinese maximum permissible limit for Cd (0.2 mg dry weight kg, 0.2 mg fresh weight kg and 0.1 mg fresh weight kg for rice, leafy vegetables and for rootstalk and legume vegetables, respectively). The median dietary Cd intake varied from 66.5 to 116 μg Cd kg body weight (BW) month, with children (4-11 years) exhibiting the highest intake. These values are 2.7-4.6 times the tolerable dietary intake of 25 μg kg BW month recommended by the Joint FAO/WHO Expert Committee on Food Additives. For the general population in Xiangtan county, rice contributed the majority (81%) of the Cd intake with vegetables contributing only 19%. The median hazard quotient calculated from dietary Cd intake was 2.4 times the permissible level, indicating a high risk to the local residents. This study highlights an urgent need to reduce the transfer of Cd from soil to the food chain in the investigated region.
中国南方部分地区土壤受到污染,致使人们饮食中镉(Cd)的摄入量增加,对人体健康构成潜在威胁。本研究对湖南省湘潭县土壤-水稻(n=200)和土壤-蔬菜(n=142)进行了配对调查,采用电感耦合等离子体质谱法(inductively coupled plasma mass spectrometry)测定了所有样本中 Cd 的浓度。根据不同年龄组人群的饮食习惯,估算了当地生产的水稻和蔬菜中 Cd 的摄入量。在调查采集的 342 个作物样本中,88%和 29%的稻谷和蔬菜样本分别超过了中国 Cd 的最大允许限量(干重 0.2 mg/kg、鲜重 0.2 mg/kg,叶菜和根菜、豆类蔬菜分别为 0.1 mg/kg)。膳食 Cd 摄入量的中位数从 66.5 到 116μg Cd/kg 体重/月不等,儿童(4-11 岁)的摄入量最高。这些值是食品添加剂联合专家委员会(Joint FAO/WHO Expert Committee on Food Additives)推荐的 25μg/kg 体重/月可耐受摄入量的 2.7-4.6 倍。对于湘潭县的一般人群,大米是 Cd 摄入的主要来源(81%),而蔬菜的贡献仅为 19%。根据膳食 Cd 摄入量计算得出的中位危害商是可接受水平的 2.4 倍,表明当地居民面临较高的风险。本研究强调了减少该地区土壤向食物链中 Cd 转移的迫切需求。