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| 1 | Comparison of Persulfate Activation and Fenton Reaction in Remediating an Organophosphorus Pesticides-Polluted Soil显示文摘Organophosphorus pesticides(OPs) are one of the most regular pollutants and frequently detected in the contaminated sites,so developing an efficient method for the treatment of OPs is highly required. The aim of the present study was to compare the effectiveness of persulfate(PS) activation and Fenton reaction in remediating the soil polluted with OPs. The polluted soil used in this study was sampled from an abandoned insecticide factory in Nantong, Jiangsu Province of China, mainly containing chloropyrifos(CP) and 4-bromo-2-chlorophenol(BCP, the raw material of profenofos) with total concentration of about 30 000 mg kg^(-1). The results showed that both BCP and CP were efficiently degraded by base activation of PS, and increasing the ratio of Na OH/PS enhanced CP degradation, but slightly decreased BCP degradation. The greatest degradation rates for CP and BCP were 92% and 97%, respectively,with 7.0 mol L^(-1) Na OH and 0.21 mol L^(-1) PS and a soil-to-liquid ratio of 1:1. Furthermore, ferrous iron activation of PS also degraded BCP efficiently, but only 60% of CP was degraded under the same reaction conditions. These results indicated that base activation of PS was more feasible than Fe^(2+) activation and Fenton reaction in remediating the soil polluted with OPs. The high degradation rate for CP may be linked to the initial hydrolyzation of CP by base to 3,5,6-trichloro-2-pyridinol, which can be further rapidly degraded by free radicals generated from base activation of PS. | ZHU Changyin ZHU Fengxiao WANG Fuwang GAO Juan FAN Guangping ZHOU Dongmei FANG Guodong | 2017 | Pedosphere2017，27，3： | 11 |
| 2 | Temporal-spatial distribution and ore-forming material source of gold,copper and silver polymetallic ore deposits in the Fuping mantle structure zone显示文摘This study was conducted following research on metallogenesis in the Zhangjiajie-Xuanhua and East Hebei mantle branch structure zones. The Fuping mantle branch structure zone is one where Au, Cu and Ag poly-metallic ore resources are concentrated in North Hebei. However, there has existed a long-standing controversy on the temporal-spatial distribution of ore resources and their ore-forming material sources. In terms of age dating and the comprehensive analysis of S, Pb, O, C and Si isotopes, it is considered that the temporal-spatial distribution of ore resources in this mantle branch structure zone is obviously controlled by the Fuping mantle branch structure. In space there is developed such a metallogenic pattern as to be Ag, Pb and Zn polymetallic ore deposits with gold appearing inside and copper appearing outside. Metallogenesis is dated mainly at Yanshanian, the ore-forming materials were derived predominantly from the deep interior of the Earth, and ore-forming fluids were derived largely from Yanshanian magmatism. | WANG Baode NIU Shuyin SUN Aiqun LIU Yaming XIE Yan JIANG Xiaoping ZHAO Yongli GAO Yincang ZHAO Fuwang | 2010 | Chinese Journal Of Geochemistry2010，29，3： | 6 |
| 3 | Investigation on foam ceramic filter to remove inclusions in revert superalloy 显示文摘 | Chen Fuwang Huang Xuebing Wang Yong | 1998 | Materials Letters1998，34，3： | 1 |
| 4 | Methods for bearings-only underwater target motion analysis显示文摘The problem of estimation of underwater target motion parameters via bearings only is the most of ten encountered and most difficult to solve in the underwater target motion analysis.As the bearings-only target motion analysis is a nonlinear and multiextremal global optimization problem, so most classical estimation methods often lead the solution to convergence to one of the local extremes other than the global extreme, especially, when the noise of target bearing observation is added. In this paper we propose to use the Generalized Least Square method on the rough estimation of target motion parameters, and then use the Sequential Uniform Design method to gain a more precise estimation on the bases of rough estimation.The latter ensures that the result convergences to the global extreme. The algorithm based on the above two methods is profitable for the bearings-only target motion analysis even under conditions of large bearing observation error. | PAN Zhijian and YAN Fuwang (Marine Research Center, P.B. 1303-15 Beijing 100073)LIU Mengan and WANG Guangen (Applied Acoustics Institute, P.B. 1 Fuyang 311400) | 1997 | Chinese Journal of Acoustics1997，16，3： | 1 |
| 5 | Heterogeneous reaction of NO_(2) with feldspar, three clay minerals and Arizona Test Dust显示文摘Heterogeneous reaction of NO_(2) with mineral dust aerosol may play important roles in troposphere chemistry,and has been investigated by a number of laboratory studies.However,the influence of mineralogy on this reaction has not been well understood,and its impact on aerosol hygroscopicity is not yet clear.This work investigated heterogeneous reactions of NO_(2)(∼10 ppmv)with K-feldspar,illite,kaolinite,montmorillonite and Arizona Test Dust(ATD)at room temperature as a function of relative humidity(<1%to 80%)and reaction time(up to 24 hr).Heterogeneous reactivity towards NO_(2) was low for illite,kaolinite,montmorillonite and ATD,and uptake coefficients of NO_(2),γ(NO_(2)),were determined to be around or smaller than 1×10^(−8);K-feldspar exhibited higher reactivity towards NO_(2),and CaCO_(3) is most reactive among the nine mineral dust samples considered in this and previous work.After heterogeneous reaction with NO_(2) for 24 hr,increase in hygroscopicity was nearly insignificant for illite,kaolinite and montmorillonite,and small but significant for K-feldspar;in addition,large increase in hygroscopicity was observed for ATD,although the increase in hygroscopicity was still smaller than CaCO_(3). | Mingjin Tang Xiaohong Jia Lanxiadi Chen Wenjun Gu Chengpeng Huang FuWang Lan Luo Hongli Wang Xinming Wang Chao Peng | 2023 | Journal of Environmental Sciences2023，，8： | 0 |
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