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891.
At present, the cyanide gold extraction process is still the main technology for gold production. Generated cyanide tailings containing highly toxic substances exhibit potential environmental risks. These tailings are in urgent need of purification treatment, especially after being classified as hazardous waste. In this study, the impacts of elution methods, operating time, tailings/water ratios, reagent types on the elution rates of cyanide were investigated. Furthermore, the composite elution ... 相似文献
892.
Dingyong Wang Yongguang Yin Shufang Zeng Xun Wang Wei Yuan Ji Luo Yong Cai Xinbin Feng Shuxiao Wang Huan Zhong Ping Li 《环境科学学报(英文版)》2022,119(9):1-10
Understanding atmospheric mercury (Hg) accumulation in remote montane forests is critical to assess the Hg ecological risk to wildlife and human health. To quantify impacts of vegetation, climatic and topographic factors on Hg accumulation in montane forests, we assessed the Hg distribution and stoichiometric relations among Hg, carbon (C), and nitrogen (N) in four forest types along the elevation of Mt. Gongga. Our results show that Hg concentration in plant tissues follows the descending order of litter > leaf, bark > root > branch > bole wood, indicating the importance of atmospheric Hg uptake by foliage for Hg accumulation in plants. The foliar Hg/C (from 237.0 ± 171.4 to 56.8 ± 27.7 µg/kg) and Hg/N (from 7.5 ± 3.9 to 2.5 ± 1.2 mg/kg) both decrease along the elevation. These elevation gradients are caused by the heterogeneity of vegetation uptake of atmospheric Hg and the variation of atmospheric Hg° concentrations at different altitudes. Organic soil Hg accumulation is controlled by forest types, topographic and climatic factors, with the highest concentration in the mixed forest (244.9 ± 55.7 µg/kg) and the lowest value in the alpine forest (151.9 ± 44.5 µg/kg). Further analysis suggests that soil Hg is positively correlated to C (r2 = 0.66) and N (r2 = 0.57), and Hg/C and Hg/N both increase with the soil depth. These stoichiometric relations highlight the combined effects from environmental and climatic factors which mediating legacy Hg accumulation and selective Hg absorption during processes of organic soil mineralization. 相似文献
893.
Qiang Zeng Pan-Pan Chen Pan Yang Chong Liu Yan-Ling Deng Qiong Luo Yu Miao Min Zhang Fei-Peng Cui Jia-Yue Zeng Tian Shi Ting-Ting Lu Da Chen Long-Qiang Wang Chun-Ping Liu Ming Jiang 《环境科学学报(英文版)》2022,120(10):30-40
Phenols have been shown to influence the cellular proliferation and function of thyroid in experimental models. However, few human studies have investigated the association between phenol exposure and thyroid cancer, and the underlying mechanisms are also poorly understood. We conducted a case-control study by age- and sex-matching 143 thyroid cancer and 224 controls to investigate the associations between phenol exposures and the risk of thyroid cancer, and further to explore the mediating role of oxidative stress. We found that elevated urinary triclosan (TCS), bisphenol A (BPA) and bisphenol S (BPS) levels were associated with increased risk of thyroid cancer (all P for trends < 0.05), and the adjusted odds ratios (ORs) comparing the extreme exposure groups were 3.52 (95% confidence interval (CI): 2.08, 5.95), 2.06 (95% CI: 1.06, 3.97) and 7.15 (95% CI: 3.12, 16.40), respectively. Positive associations were also observed between urinary TCS, BPA and BPS and three oxidative stress biomarkers measured by 8-hydroxy-2′-deoxyguanosine (8-OHdG), 8-iso-prostaglandin F2α (8-isoPGF2α) and 4-hydroxy-2-nonenal-mercapturic acid (HNE-MA), as well as between urinary 8-isoPGF2α and HNE-MA and the risk of thyroid cancer. Mediation analysis showed that urinary 8-isoPGF2α mediated 28.95%, 47.06% and 31.08% of the associations between TCS, BPA and BPS exposures and the risk of thyroid cancer, respectively (all P < 0.05). Our results suggest that exposure to TCS, BPA and BPS may be associated with increased risk of thyroid cancer and lipid peroxidation may be an intermediate mechanism. Further studies are warranted to confirm the findings. 相似文献
894.
Hezhong Tian Lining Luo Xiaoxuan Bai Shuhan Liu Bobo Wu Wei Liu Yunqian Lv Zhihui Guo Shumin Lin Shuang Zhao Yan Hao Jiming Hao Kai Zhang Aihua Zheng 《环境科学学报(英文版)》2022,34(11):187-198
Particulate matter (i.e., PM1.0 and PM2.5), considered as the key atmospheric pollutants, exerts negative effects on visibility, global climate, and human health by associated chemical compositions. However, our understanding of PM and its chemical compositions in Beijing under the current atmospheric environment is still not complete after witnessing marked alleviation during 2013–2017. Continuous measurements can be crucial for further air quality improvement by better characterizing PM pollution and chemical compositions in Beijing. Here, we conducted simultaneous measurements on PM in Beijing during 2018–2019. Results indicate that annual mean PM1.0 and PM2.5 concentrations were 35.49 ± 18.61 µg/m3 and 66.58 ± 60.17 µg/m3, showing a positive response to emission controls. The contribution of sulfate, nitrate, and ammonium (SNA) played an enhanced role with elevated PM loading and acted as the main contributors to pollution episodes. Discrepancies observed among chemical species between PM1.0 and PM2.5 in spring suggest that sand particles trend to accumulate in the range of 1–2.5 µm. Pollution episodes occurred accompanied with southerly clusters and high formation of SNA by heterogeneous reactions in summer and winter, respectively. Results from positive matrix factorization (PMF) combined with potential source contribution function (PSCF) models showed that potential areas were seasonal dependent, secondary and vehicular sources became much more important compared with previous studies in Beijing. Our study presented a continuous investigation on PM and sources origins in Beijing, which provides a better understanding for further emission control as well as a reference for other cities in developing countries. 相似文献
895.
Li Ke Fan Guangsen Tian Huafeng Yuan Li Yao Yuanyuan Xiang Aimin Luo Xiaogang 《Journal of Polymers and the Environment》2021,29(10):3263-3270
Journal of Polymers and the Environment - With the advantages of excellent processability and biodegradability, polyvinyl alcohol (PVA) becomes an environmentally friendly and biocompatible... 相似文献
896.
Liang Fei Wen Yongkang Dong Xiao Wang Yiyao Pan Guangyuan Jiang Fangying Luo Huaying Jin Wenjun Wang Jun Song He 《Environmental science and pollution research international》2021,28(23):29332-29343
Environmental Science and Pollution Research - Nitrite oxidation as the second step of nitrification can become the determining step in disturbed soil systems. As a beneficial fertilization... 相似文献
897.
898.
Wuxing Liu Yongming Luo Ying Teng Zhengao Li Lena Q. Ma 《Environmental geochemistry and health》2010,32(1):23-29
In situ bioremediation of oily sludge-contaminated soil by biostimulation of indigenous microbes through adding manure was
conducted at the Shengli oilfield in northern China. After bioremediation for 360 days, total petroleum hydrocarbon (TPH)
content was reduced by 58.2% in the treated plots compared with only 15.6% in the control plot. Moreover, bioremediation significantly
improved the physicochemical properties of the soil in the treated plot. Soil microbial counts and community-level physiological
profiling were also examined. Manure addition increased TPH degraders and polycyclic aromatic hydrocarbon (PAH) degraders
in the contaminated soil by one to two orders of magnitude. The activity and biodiversity of soil microbial communities also
increased markedly in the treated plot compared with that of the control. Finally, biotoxicity was used to evaluate the soils
and a sharp increase in the EC50 of the soil after bioremediation was observed, indicating that bioremediation had reduced
the toxicity of the soil. 相似文献
899.
900.
针对三峡库区城市污水氮磷浓度较低的特点,结合城市污水处理旁路污泥减量技术研究,探索了利用鸟粪石结晶沉淀法回收城市污水中氮磷的可行性及影响因素。研究结果表明:低氮磷浓度时,鸟粪石结晶回收氮磷的规律与国内外已有的针对高浓度氮磷的研究规律不同,当污泥厌氧减量池中磷酸盐质量浓度为30~60 mg/L(约为1~2mmol/L)时,在pH值为10.0~10.5,c(Mg2+)∶c(NH 4+)∶c(PO34-)为1∶1.6∶1,反应时间为25 min,搅拌强度在200 r/min的条件下,通过鸟粪石沉淀反应磷去除率可达50%~75%,氮的去除率最高可达51%。 相似文献