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761.
Concentrations of halogens (Cl, Br and I) in 30 Japanese rivers were measured by ion chromatography and inductively coupled plasma mass spectrometry to understand their behavior in the terrestrial environment. Concentrations of Cl, Br and I in each river, obtained at 10 sampling points from the upper stream to the river mouth, tended to increase near the river mouth. The ranges of geometric means of Cl, Br and I in each river were 1.0–19.4 mg l−1, 2.5–67.9 μg l−1, and 0.18–8.34 μg l−1, respectively. To compare halogen behavior, the concentration ratios, Br/Cl and I/Cl, were calculated. The Br/Cl range was (2.3–7.8) × 10−3 (geometric mean: 3.74 × 10−3), and it was nearly constant except for the Yoneshiro river. It was estimated that 60–80% of total Br in the middle to lower parts of this river was the excess Br. The Br chemical form in all the rivers is generally considered to be Br−. The I/Cl ratios had different trends in rivers flowing into the Japan Sea and Pacific Ocean, possibly due to the different geological features in the river catchments. 相似文献
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为探析PM10短期暴露对不同糖代谢水平人群空腹血糖和血脂的影响,以“金昌队列”为研究平台,收集金昌市2011~2017年污染物数据及气象数据.采用近邻模型完成个体PM10暴露评估.运用广义估计方程分析PM10对血糖和血脂指标的影响.采用广义相加混合模型绘制暴露-反应关系曲线.结果表明,PM10浓度每增加一个四分位数间距,空腹血糖(FPG)、总胆固醇(TC)、低密度脂蛋白胆固醇(LDL-C)和高密度脂蛋白胆固醇(HDL-C)分别升高0.58mg/dL (95% CI:0.35,0.82)、0.38mg/dL (95% CI:0.25,0.52)、0.44mg/dL (95% CI:0.31,0.57)和0.34mg/dL (95% CI:0.29,0.40),甘油三酯(TG)降低0.67mg/dl (95% CI:-0.86,-0.47).随着PM10浓度升高,FPG、TC、LDL-C和HDL-C均呈上升趋势,TG呈下降趋势.PM10对男性、年龄≥60岁者血糖和血脂指标影响更显著.因此,PM10与不同糖代谢状态人群血糖和血脂水平异常密切相关,男性和老年人应加强自身防护. 相似文献
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Use of catalytic wet air oxidation (CWAO) for pretreatment of high-salinity high-organic wastewater 下载免费PDF全文
Chenglin Sun Wenjing Sun Hongxia Lv Lei M Xiangdong Tan Chengyu Jin Huiling Wu Lili Chen Mengyang Liu Huangzhao Wei 《环境科学学报(英文版)》2022,34(10):105-114
Catalytic wet air oxidation (CWAO) coupled desalination technology provides a possibility for the effective and economic degradation of high salinity and high organic wastewater. Chloride widely occurs in natural and wastewaters, and its high content jeopardizes the efficacy of Advanced oxidation process (AOPs). Thus, a novel chlorine ion resistant catalyst B-site Ru doped LaFe1-xRuxO3-δ in CWAO treatment of chlorine ion wastewater was examined. Especially, LaFe0.85Ru0.15O3-δ was 45.5% better than that of the 6%RuO2@TiO2 (commercial carrier) on total organic carbon (TOC) removal. Also, doped catalysts LaFe1-xRuxO3-δ showed better activity than supported catalysts RuO2@LaFeO3 and RuO2@TiO2 with the same Ru content. Moreover, LaFe0.85Ru0.15O3-δ has novel chlorine ion resistance no matter the concentration of Cl− and no Ru dissolves after the reaction. X-ray diffraction (XRD) refinement, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), and X-ray absorption fine structure (XAFS) measurements verified the structure of LaFe0.85Ru0.15O3-δ. Kinetic data and density functional theory (DFT) proved that Fe is the site of acetic acid oxidation and adsorption of chloride ions. The existence of Fe in LaFe0.85Ru0.15O3-δ could adsorb chlorine ion (catalytic activity inhibitor), which can protect the Ru site and other active oxygen species to exert catalytic activity. This work is essential for the development of chloride-resistant catalyst in CWAO. 相似文献