摘要
为了评估南方某县土壤镉污染情况、量化当地不同作物镉含量并对不同人群健康风险进行评估,从该县3个镇采集135份土壤样本,入户采集128份自产大米样本,种植区采集7份脐橙样本,对其中镉含量进行测定。结果表明,3镇采集土壤样品镉超标率分别为41.67%、28.81%和21.62%,地累积指数计算得到该县68.9%的土壤样本受到不同程度的镉污染,大米镉含量超标率分别为48.57%、34.48%、8.82%。而脐橙果肉样品中镉含量较低,远低于0.05 mg·kg^-1。计算不同作物的危害商数(HQ)可得,食用自产大米的危害商数(HQ)值普遍大于1,风险较高,而食用脐橙果肉产生的健康风险低。种植脐橙具有一定的经济效益,且当地具有脐橙适宜的生长条件,故考虑在重污染区种植脐橙取代种植水稻。
A county in southern China is rich in mineral resources and suffers from serious soil cadmium pollution.To assess local soil cadmium pollution and the health risks of different populations and quantify the cadmium content of different local crops,a total of 135 soil samples were collected from three towns in the county;128 rice samples were obtained from households,and seven navel orange samples were acquired from planting areas.The results revealed that the excess cadmium rates of the soil samples were 41.67%,28.81%,and 21.62%,respectively.According to a geo-accumulation index,68.9%of the soil samples in the county were polluted with cadmium to different degrees.The excess cadmium contents of the rice samples ranged from 8.82%to 48.57%among locations.The navel orange pulp cadmium content was<0.05 mg·kg^-1.The hazard quotient value of consuming home-grown rice was generally>1,which constitutes a high risk,whereas the health risk of consuming navel orange pulp was low.Orange planting has certain economic benefits,and navel orange is suitable for cultivation under local conditions.Therefore,it is recommended that local residents of heavily polluted areas buy commercially sold rice and farm navel orange instead of rice.
作者
张妍
张磊
程红光
孙海旭
崔祥芬
ZHANG Yan;ZHANG Lei;CHENG Hong-guang;SUN Hai-xu;CUI Xiang-fen(School of Environment,Beijing Normal University,Beijing 100875,China;Marine Information Center,Cnooc Information Technology Co.,LTD.,Beijing 100027,China)
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2020年第12期2752-2761,共10页
Journal of Agro-Environment Science
基金
国家自然科学基金项目(41171384)。
关键词
矿区
镉
大米
膳食暴露
种植结构
mining area
cadmium
rice
dietary exposure
planting structure
