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21.
Xie Shuqin Liu Mingyang Zhang Xiangling Yang Chao Zhang Yueling Qin Yaojun He Chuntao Dou Yankai Gao Chenguang Yuan Ye 《Environmental science and pollution research international》2023,30(8):19814-19827
Environmental Science and Pollution Research - The study aimed to synthesize novel zeolite substrates modified with four types of ZnAl-LDHs including Cl-LDHs(1:1), Cl-LDHs(3:1), CO3-LDHs(1:1), and... 相似文献
22.
Lihua Pang Qianhui Lin Shasha Zhao Hao Zheng Chenguang Li Jing Zhang Cuizhu Sun Lingyun Chen Fengmin Li 《Frontiers of Environmental Science & Engineering》2023,17(8):94
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通过设定三级分析指标,对经济发展与资源消耗、污染物排放、工业污染治理投资定量对比分析的基础上,研究1999年-2009年间内蒙古经济发展和环境现状。结果表明,近十年间内蒙古以化石能源消费为主的高耗能工业占主导地位,能源消费支撑了经济发展,二氧化硫减排压力依然艰巨。通过生态承载能力分析,内蒙古区域生态赤字呈逐年增加态势,生态压力指数加大,但处于可控状态,对地区生态影响最大的依然是农耕、农牧经济,化石能源和建筑用地人均生态足迹增幅最大,应引起高度重视。 相似文献
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The biokinetics of Cu in Daphnia magna, including dissolved uptake, assimilation and e ux, has been determined using a gamma
67Cu radiotracer methodology. However, this gamma emitting radioisotope is not readily available due to its very short half-life. In the
present study, we employed a stable isotope tracer (65Cu) to determine the Cu biokinetics and compared our results to those determined
using 67Cu. The dissolved uptake rate constant of 65Cu was 3.36 L/(g day), which is higher than that of 67Cu (1.32 L/(g day)). With
increasing food concentrations from 2 104 to 1 105 cells/mL, the Cu assimilation e ciency (AE) decreased from 46% to 11%,
compared to a decrease from 27% to 16% when determined using 67Cu. The e ux of Cu from Daphnia magna was quantified following
both dissolved and dietary uptake. The e ux of waterborne Cu was comparable to that of dietborne Cu and the e ux rate constant
(0.32–0.52 day??1) was higher than that determined by 67Cu (0.19–0.20 day??1). By considering di erent water properties and handling
procedure between the two experiments, we believe that these di erences are reasonable. Overall, this study demonstrated that the
enriched stable isotope tracer technique is a powerful tool to investigate metal bioavailability and maybe a good alternative to radioactive
measurements. 相似文献