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11.
A human health risk assessment of rare earth elements in soil and vegetables from a mining area in Fujian Province,Southeast China 总被引:1,自引:0,他引:1
Contaminated food through dietary intake has become the main potential risk impacts on human health. This study investigated concentrations of rare earth elements (REEs) in soil, vegetables, human hair and blood, and assessed human health risk through vegetables consumption in the vicinity of a large-scale mining area located in Hetian Town of Changting County, Fujian Province, Southeast China. The results of the study included the following mean concentrations for total and bio-available REEs of 242.92 ± 68.98 (135.85–327.56) μg g−1 and 118.59 ± 38.49 (57.89–158.96) μg g−1 dry weight (dw) in agricultural soil, respectively, and total REEs of 3.58 ± 5.28 (0.07–64.42) μg g−1 dw in vegetable samples. Concentrations of total REEs in blood and hair collected from the local residents ranged from 424.76 to 1274.80 μg L−1 with an average of 689.74 ± 254.25 μg L−1 and from 0.06 to 1.59 μg g−1 with an average of 0.48 ± 0.59 μg g−1 of the study, respectively. In addition, a significant correlation was observed between REEs in blood and corresponding soil samples (R2 = 0.6556, p < 0.05), however there was no correlation between REEs in hair and corresponding soils (p > 0.05). Mean concentrations of REEs of 2.85 (0.59–10.24) μg L−1 in well water from the local households was 53-fold than that in the drinking water of Fuzhou city (0.054 μg L−1). The health risk assessment indicated that vegetable consumption would not result in exceeding the safe values of estimate daily intake (EDI) REEs (100−110 μg kg−1 d−1) for adults and children, but attention should be paid to monitoring human beings health in such rare earth mining areas due to long-term exposure to high dose REEs from food consumptions. 相似文献
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钼矿区污灌菜地土壤重金属污染的生态风险预警评价 总被引:1,自引:0,他引:1
通过对钼矿区地下水进行重金属含量分析,发现地下水已受重金属污染。该受污染地下水为矿区菜地唯一灌溉用水。本文研究钼矿区污灌菜地土壤的重金属污染现状及生态风险。选取矿区、尾矿区、选矿区周边菜地的土壤样本60个,用HNO3-HF-HClO4处理后,采用等离子体发射光谱仪(ICP-AKS)测定土壤样品中Pb、As、Hg、Cr、Cd、Zn、Cu、Ni的全量,采用生态风险指数进行生态风险预警评价。结果表明:矿区、尾矿区、选矿区周边受污染菜地尾矿区农田土壤的生态风险指数(IER)分别为59.42、80.60、154.83,其预警类型均为重警;污染程度为矿区菜地〈尾矿区菜地〈选矿区菜地。 相似文献
14.
太原市蔬菜中铅、铬和镉含量分析及安全性评价 总被引:14,自引:0,他引:14
白红娟 《中国安全科学学报》2004,14(12):78-81
笔者采用原子吸收光谱法 ,测定了太原市蔬菜批发市场的 8种蔬菜 72个样品的铅、铬、镉含量。结果表明 :在检测的 8种蔬菜中 ,有 5种蔬菜出现铅含量超标 ,铅是蔬菜中的主要污染元素 ,且污染带有普遍性 ;铬的污染仅出现在芹菜和青菜上 ,其他 6种蔬菜均无超标 ;8种蔬菜均未受到镉的污染 ,合格率为 10 0 %。参照国家食品卫生标准和蔬菜质量分级标准 ,对蔬菜的重金属污染程度进行了安全性评价。在所检测的蔬菜样品中 ,只有青菜受到重金属污染 ,其综合污染指数为 1.12 ,污染程度为轻度污染。其他蔬菜的综合污染指数均低于 0 .7,污染程度均为安全 ,污染水平均为清洁。 相似文献
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Occurrence and source analysis of typical veterinary antibiotics in manure, soil, vegetables and groundwater from organic vegetable bases, northern China 总被引:19,自引:0,他引:19
The residue of antibiotics is becoming an intractable environmental problem in many organic vegetable bases. However, their residual levels and distribution are still obscure. This work systematically analyzed the occurrence and migration of typical veterinary antibiotics in organic vegetable bases, northern China. The results showed that there was no obvious geographical difference in antibiotic distribution between soil and manure. A simple migration model can be easy and quick to predict the accumulation of antibiotics in soil. Antibiotics were mainly taken up through water transport and passive absorption in vegetables. The distribution of antibiotics in a plant was in the sequence leaf > stem > root, and performed biological accumulation. The residues of antibiotics in all samples in winter were significantly higher than those in summer. Overall, this work can lay the foundation for understanding ecological risk of antibiotics and their potential adverse effects on human health by food chain. 相似文献
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The concentrations, distribution and sources of PAHs in agricultural soils and vegetables from Shunde, Guangdong, China 总被引:4,自引:0,他引:4
Li YT Li FB Chen JJ Yang GY Wan HF Zhang TB Zeng XD Liu JM 《Environmental monitoring and assessment》2008,139(1-3):61-76
The concentrations, distribution and sources of 16 polycyclic aromatic hydrocarbons (PAHs) were determined in 30 agricultural
soil and 16 vegetable samples collected from subtropical Shunde area, an important manufacturing center in China. The total
PAHs ranged from 33.7 to 350 μg/kg in soils, and 82 to 1,258 μg/kg in vegetables. The most abundant individual PAHs are phenanthrene,
fluoranthene, chrysene, pyrene and benzo(b)fluoranthene for soil samples, and anthracene, naphthalene, phenanthrene, pyrene
and chrysene for vegetable samples. Average vegetable–soil ratios of total PAHs were 2.20 for leafy vegetables and 1.27 for
fruity vegetables. Total PAHs in vegetable samples are not significantly correlated to those in corresponding soil samples.
Principal component analyses were conducted to distinguish samples on basis of their distribution in each town, soil type
and vegetable specie. Relatively abundant soil PAHs were found in town Jun’an, Beijiao, Chencun, Lecong and Ronggui, while
abundant vegetable PAHs were observed in town Jun’an, Lecong, Xingtan, Daliang and Chenchun. The highest level of total PAHs
were found in vegetable soil, followed by pond sediment and “stacked soil” on pond banks. The PAHs contents in leafy vegetables
are higher than those in fruity vegetables. Some PAH compound ratios suggest the PAHs derived from incomplete combustion of
petroleum, coal and refuse from power generation and ceramic manufacturing, and paint spraying on furniture, as well as sewage
irrigation from textile industries. Soil PAHs contents have significant logarithmic correlation with total organic carbon,
which demonstrates the importance of soil organic matter as sorbent to prevent losses of PAHs. 相似文献
17.
基于GIS的南京市典型蔬菜基地土壤重金属污染现状与评价 总被引:13,自引:3,他引:13
对南京市八卦洲蔬菜基地土壤中的铅、铬、铜和镉进行测定分析,利用不同的评价标准来评价其环境质量状况,同时借助GIS软件研究了污染指数的空间分布状况,并解析了其重金属污染的来源.结果表明,以自然背景值为评价标准,则蔬菜地土壤中的重金属都超过污染指标,其中镉为首要污染因子;以国标二级为评价标准,则除镉以外的三种重金属的单项污染指数值全都小于1,但其综合污染指数迭1.50,总体上属轻污染状况.南京化工因区、南京长江二桥和各种农业生产活动等可能是主要污染源. 相似文献
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Ahmad K. Hegazy Mahmoud A. Medany Hanan F. Kabiel Mona M. Maez 《Natural resources forum》2008,32(4):316-326
This study focuses on the management of the local agroecosystems in order to adapt planting or sowing practices for the projected climate change scenarios. It is projected that there will be increased air temperature throughout all four seasons in the coming 100 years, from the southern towards the northern parts of Egypt. The objective of this study is to investigate the influence of that increased air temperature on the spatial and temporal distribution of four of the major economic crops in Egypt. The study species are cotton (Gossypium barbadense L., cv. Giza 89), wheat (Triticum aestivum L., cv. Gemiza 9), rice (Oryza stiva L., cv. Sakha 101) and maize (Zea mays L., cv. Hybrid 10). Optimum air temperature allowing maximum growth for each of the study crop cultivars and the current and projected air temperature patterns in the future years were used for projection of the seasonal and crop distribution maps in the years 2005, 2025, 2050, 2075 and 2100. Results showed that sowing dates of a target crop may be managed in order to allow maximum predicted planting area in the same region. The current maximum area suitable for planting the Cotton crop in Egypt (104 thousand Fadden/year; one Fadden = 0.96 hectare or 0.42 acre) showed few variations over the coming hundred years. In this case, the sowing dates should be changed from the hotter months (February to April) to the cooler months (January to February). Alternatively, a great reduction in the area planted by Wheat crop was predicted in the coming 100 years. Despite the early planting, a reduction of about 147 thousand Fadden/year was projected by the year 2075. On the other hand, with earlier sowing dates, the maximum areas that are planted by Rice and Maize may not be greatly affected by the projected increase in air temperature. 相似文献
20.
降低蔬菜中硝酸盐含量的途径及其机制 总被引:12,自引:0,他引:12
蔬菜是一种喜硝,富氮的作物,所以蔬菜中硝酸盐含量较高。目前,由于偏施大量氮肥,造成蔬菜,特别是叶菜内硝酸盐含量大大超过健康标准。因此在保证高产的前提下,降低硝酸盐含量,提高品质,是迫切需要解决的问题。大量的研究表明,影响蔬菜中硝酸盐含量的因素既有内部的(品种等),也有外部的(肥料,光照等)。本文对降低蔬菜中硝酸盐含量的途径及其机制作一综述。 相似文献