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571.
Spatial trend and pollution assessment of total mercury and methylmercury pollution in the Pearl River Delta soil, South China 总被引:2,自引:0,他引:2
Total mercury (THg) and methylmercury (MeHg) were measured in large number of soil samples collected from areas with different types of land use, different depth in the Pearl River Delta (PRD) of South China. THg and MeHg concentrations ranged from 16.7 to 3320 ng g−1 and 0.01 to 1.34 ng g−1, respectively. THg levels are highest in the top 0-20 cm soil layer, and decrease from the surface to bottom layer soil. Spatial variation was observed with different types of land use. Urban parks had the highest concentrations and the other areas tended to decrease in the order of residential areas, industrial areas, vegetable fields, cereal fields, and woodlands. Temporal variation was also noted, and two relatively high THg contamination zones located in the northwestern part of the PRD have significantly expanded over the last two decades. Both THg and MeHg concentrations were correlated significantly with soil organic matter (OM), but not with soil pH. THg pollution status was evaluated using two assessment methods. 相似文献
572.
573.
Bin Han Yating Liu Yan You Jia Xu Jian Zhou Jiefeng Zhang Can Niu Nan Zhang Fei He Xiao Ding Zhipeng Bai 《Environmental science and pollution research international》2016,23(20):20194-20204
Assessment of the health risks resulting from exposure to ambient polycyclic aromatic hydrocarbons (PAHs) is limited by the lack of environmental exposure data among different subpopulations. To assess the exposure cancer risk of particulate carcinogenic polycyclic aromatic hydrocarbon pollution for the elderly, this study conducted a personal exposure measurement campaign for particulate PAHs in a community of Tianjin, a city in northern China. Personal exposure samples were collected from the elderly in non-heating (August–September, 2009) and heating periods (November–December, 2009), and 12 PAHs individuals were analyzed for risk estimation. Questionnaire and time-activity log were also recorded for each person. The probabilistic risk assessment model was integrated with Toxic Equivalent Factors (TEFs). Considering that the estimation of the applied dose for a given air pollutant is dependent on the inhalation rate, the inhalation rate from both EPA exposure factor book was applied to calculate the carcinogenic risk in this study. Monte Carlo simulation was used as a probabilistic risk assessment model, and risk simulation results indicated that the inhalation-ILCR values for both male and female subjects followed a lognormal distribution with a mean of 4.81?×?10?6 and 4.57?×?10?6, respectively. Furthermore, the 95 % probability lung cancer risks were greater than the USEPA acceptable level of 10?6 for both men and women through the inhalation route, revealing that exposure to PAHs posed an unacceptable potential cancer risk for the elderly in this study. As a result, some measures should be taken to reduce PAHs pollution and the exposure level to decrease the cancer risk for the general population, especially for the elderly. 相似文献
574.
575.
丁霞 《中国人口.资源与环境》1995,(3)
本文通过山东省枣庄市峄城区萝藤乡建立生态经济乡途径研究的实践,探讨了在乡域实现资源与环境协调发展的新思路,为我国农村现代化建设做出了有益的尝试。 相似文献
576.
黄山风景景观的地貌条件研究 总被引:2,自引:0,他引:2
黄山风景景观是多种因素共同作用的结果,本文着重探讨了地貌条件在黄山风景景观形成中的特殊作用,以便为进一步开发利用黄山,保护生态环境提供科学参考。 相似文献
577.
578.
In this paper, according to the data from several single nuclear explosion experiments of an equivalent to magnitude of million tons, and combined with meteorological data, their effects on the regional climate nave been analysed. 相似文献
579.
580.
凤眼莲(Eichhornia crassipes Solms)对染料色水脱色作用的初步研究 总被引:4,自引:0,他引:4
经凤眼莲对染料色水的脱色作用静态试验表明,凤眼莲对阳离子、活性、直接、还原和酸性等染料有显著的脱色作用,其中对阳离子染料的脱色尤为有效,脱色率最高可达98%。还进行了小型动态实验,并建立了一个反映脱色率与进水色度、色水停留时间和凤眼莲生物量等参数间相关关系的数学模型。试验结果表明,凤眼莲的脱色作用具有酶促反应的若干特点,Ca~(2+)、Mn~(2+)等离子的存在可使脱色率显著提高。 相似文献