基于Monte Carlo模拟的某污染场地土壤重金属健康风险评估研究

文章针对土壤重金属健康风险评价中存在的不确定性问题,参照相关规范中的计算模型,采用Monte Carlo模拟技术模拟某搬迁铅蓄电池场地中Pb、Cr、As、Cd 4种重金属元素质量比的分布特征,进而评价其人体健康风险水平。研究结果表明:研究区重金属元素存在致癌风险和非致癌风险,其中致癌风险和非致癌风险均以重金属Cr^(6+)为主要影响因素,其对非致癌风险和致癌风险的贡献率分别为50.9%、44.9%。该研究定量分析土壤重金属元素健康风险评估中存在的不确定性,可为解决类似场地的土壤重金属元素健康风险评估的不确定性问题提供参考。

基于函数型数据的洞庭湖重金属健康风险评价

洞庭湖近年来受气候变化、江湖关系改变和人类活动等因素的共同影响,使得洞庭湖的蓄水量减少,自净能力下降,入湖污染负荷增多,重金属程度加重,已经严重影响到沿湖各县市的生产生活需要。基于函数型数据进行分析,构建出一种新的水质风险动态评价模型来对洞庭湖进行重金属健康风险进行评价。

郑汴路路旁土壤-小麦系统重金属积累及其健康风险评价

按离路基不同距离采集土壤、麦苗和籽粒样品,在测定样品重金属(Pb、Cd、Zn、Cr和Cu)的基础上,开展了路旁土壤-小麦系统重金属分布、积累和污染状况分析,并对膳食小麦(Triticumaestivum)引起的健康风险进行了评价。结果表明:1)土壤-小麦系统重金属含量随着离开路基距离的增加呈先增加后减少的趋势,土壤重金属含量>麦苗重金属含量>籽粒重金属含量。2)麦苗和小麦籽粒对土壤重金属富集能力的大小顺序均为Cu>Cd>Zn>Pb>Cr,麦苗对重金属的富集能力大于小麦籽粒。3)膳食小麦所致的Cd个人健康风险较大。

Source and hazard identification of heavy metals in soils of Changsha based on TIN model and direct exposure method

A total of 153 soil samples were collected from Changsha City, China, to analyze the contents of As, Cd, Cr, Cu, Hg, Mn, Ni, Pb and Zn. A combination of sampling data, multivariate statistical method, geostatistical analysis, direct exposure method and triangulated irregular network （TIN） model was successfully employed to discriminate sources, simulate spatial distributions and evaluate children＇s health risks of heavy metals in soils. The results show that not all sites in Changsha city may be suitable for living without remediation. About 9.0% of the study area provided a hazard index （HI）1.0, and 1.9% had an HI2.0. Most high HIs were located in the southern and western areas. The element of arsenic and the pathway of soil ingestion were the largest contribution to potential health risks for children. This study indicates that we should attach great importance to the direct soil heavy metals exposure for children＇s health.

Migration and transfer of chromium in soil-vegetable system and associated health risks in vicinity of ferro-alloy manufactory

Study was carried out to analyze the distribution and migration patterns,soil-to-plant transfer and potential health risks of chromium in soil-vegetable system in areas near a ferro-alloy manufactory in Hunan province.The results show that soils near sewer outlet,sewer channel and in control area are averaged 2 239.5,995.33 and 104.9 mg/kg,respectively.The total Cr has a relative accumulation in soil depth of 200-400 mm near the sewer outlet,mainly enriches in the surface layer（0-200 mm） near the sewer channel and decreases gradually in unpolluted soils.The differential concentration level of enrichment between layers is little.The results also indicate that the three vegetables of celery,lettuce and Chinese cabbage are able to convert the potentially toxic Cr（Ⅵ） species into the non-toxic Cr（Ⅲ） species,and the chromium contents in the edible parts of the vegetables are averaged 11.95 mg/kg.The transfer factors of the three vegetables follow the order：Chinese cabbage lettuce celery.The estimated total daily intake of chromium substantially exceeds the dietary allowable value,which may pose health risks to local population.

Status and Health Risk Assessment of Heavy Metal Contamination in Vegetables

[Objective] This study aimed to protect people＇s food hygiene safety and improve the quality of vegetables. [Method] The residual contents of heavy metals （Cu, Zn, Pb, Cd and Cr） in the vegetables purchased from local market of Yuhui District, Bengbu City were determined. According to the standard limits of the International Commission on Radiological Protection （ICRP）, the health risk of vegetables with excessive heavy metal residues was assessed. [Result] The Pb content in some commercially purchased vegetables exceeded the national standard. The health risk of the vegetables contaminated by Pb was 4.467×10^-7a^-1, which was lower than the standard limit （5.0×10^-5a^-1） of the ICPR. Thus, the vegetables posed no significant risk to human health. [Conclusion] The risk of commercially purchased vegetables to human health was low.

Surface water quality and potential health risk assessments in Changsha-Zhuzhou-Xiangtan section of Xiangjiang River, China

The Changsha-Xiangtan-Zhuzhou City Group is a heavy industrial district and accepted as the serious pollution area in the Xiangjiang River basin.In this study,7 metals(Pb,Hg,Cd,As,Zn,Cu and Se)and the river water quality parameters including pH,dissolved oxygen(DO),Escherichia coli(E.coli),potassium permanganate index(CODMn),dichromate oxidizability(CODCr),five-day biochemical oxygen demand(BOD5),ammonia nitrogen(NH4+-N),total nitrogen(TN),total phosphorus(TP)and fluoride(F)in 18 sampling sites of the Changsha-Xiangtan-Zhuzhou section are monthly monitored in 2016,which is the year to step into the second stage of the“Xiangjiang River Heavy Metal Pollution Control Implementation Plan”.It is found that E.coli,TN and TP are the main pollutants in the Changsha-Zhuzhou-Xiangtan section,and the pollution of heavy metal is not serious but As with potential risk to local people especially children should be concerned.In addition,Xiangtan city is mainly featured with heavy metal pollution,while Zhuzhou and Changsha city are both featured with other pollutants from municipal domestic sewage.

Assessment of Dietary Exposure and Health Risk to Multiple Heavy Metals amongst Some Workers in Yaounde, Cameroon

This study reports on the dietary exposure of people in Yaounde, Cameroon to heavy metals： lead （Pb）, cadmium （Cd）, mercury （Hg）, copper （Cu） and zinc （Zn）. One hundred and fifty table-ready food, water and soft drink samples were collected from households and street restaurants in Yaounde and analyzed for heavy metals contents using atomic absorption spectrophotometer. Lead （93%, range 0.019-1.77 ppm）, Cd （70%, range 0.01-4.68 ppm）, Hg （81%, range 0.03-10.56 ppm）, Cu （90%, range 0.004-40.32 ppm） and Zn （87%, range 0.014-2,447.04 ppm） were detected in studied samples. Maximum level of each metal exceeded its corresponding European Commissions legislative limits. Samples from street restaurants were most tainted with heavy metals. The highest average daily intakes （ADIs） of Pb （0.96 mg/day） and Hg （1.84 mg/day） were through tap water, while Cd （1.15 mg/day）, Cu （5.42 mg/day） and Zn （601.6 mg/day） were through rice/peanut sauce mixed food. The ADI for Cd and Hg was each higher than its respective PTDI （provisional tolerable daily intake） as defined by JECFA （Joint FAO/WHO Expert Committee on Food Additives） and EVM （Expert Group on Vitamins and Minerals）. The estimated average daily exposure dose of each detected metal significantly （p = 0.001） exceeded its corresponding PTDI. However, the health risk index was 〈 1 for all studied samples and it was found to be safe, indicating there is a relative absence of health risks associated with the ingestion of contaminated foods, water and soft drinks. Notwithstanding, the detected levels and ADI being higher than legislative limits and PTDI respectively speculates need for awareness raising towards reducing exposure levels to heavy metals in Cameroon.

Health Risk Assessment of Heavy Metals in Groundwater： The Effect of Evaporation Ponds of Distillery Spent Wash

The current study was carried out to examine the heavy metals （Cd, Co, Cr, Cu, Mn, Ni, Pb, Zn and As） concentration in GW （groundwater） samples in the vicinity of distillery spent wash evaporation ponds and RGW （reference groundwater） samples collected 2 km to 3 km away from the source. The study examines the potential health risk caused by consumption of heavy metals to local inhabitants living around distillery spent wash evaporation ponds. HM （heavy metals） concentration was determined by AAS （atomic absorption） and the results were compared with permissible limits of PEPA （pakistan environmental Protection Agency） and WHO （World Health Organization）, set for industria effluents and drinking water. The health risk assessment such as CDI （chronic daily intake） and HQ （hazard quotient） were determined on the sources ofHM concentration. The cm of heavy metals in GW were found in following decreasing order Fe, Zn, Mn, Ni, Co, Cu, Cr, Cd, Pb and As. The HQ indexes of HM in the GW samples near the distillery spent wash evaporation ponds was in the order As, C, Ni, Cu, Mn, Zn, Pb and Cr. The results showed that the distillery spent wash is the cause for the change in HM contents of the study area.