作者： Li, Yongmei;Tan, Wanyu;Tan, Kaixuan*;Liu, Zehua;Fang, Qi;...

期刊： Applied Radiation and Isotopes,2018年132:164-169 ISSN：0969-8043

通讯作者： Tan, Kaixuan

作者机构： [Guo, Yueyue; Li, Yongmei; Liu, Zehua; Tan, Wanyu; Tan, Kaixuan; Duan, Xianzhe] Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.;[Fang, Qi; Lv, Junwen; Liu, Zhenzhong] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Tan, Kaixuan] U;Univ South China, Sch Nucl Resources Engn, Hengyang 421001, Hunan, Peoples R China.

关键词： Diffusion coefficient;Laterite;Radon;Soil density

摘要： Radon generated in porous media such as soils and rocks migrates into indoor and outdoor air mainly by diffusion, possessing significant hazards to human health. In order to reduce these hazards of radon, it is of great importance to study the diffusion behavior of radon. In this study, we systematically measured the radon diffusion coefficient of laterite with the density ranging from 0.917 g cm −3 to 2.238 g cm −3 , and studied the effect of laterite density on the radon diffusion. The results show that the radon diffusion coefficient of the laterite generally decreases with the increasing laterite density. In addition, three possible relationships between the radon diffusion coefficient and the laterite density are found out as follows: (1) the linear correlation with a slope of −4.48 × 10 −6 for laterite with density ranging from 0.917 to 1.095 g cm −3 , (2) the exponential correlation for laterite with density from 1.095 to 1.63 g cm −3 , (3) linear correlation with a slope of −3.1 × 10 −7 for laterite with density from 1.63 to 2.238 g cm −3 . The complex relationship between the radon diffusion coefficient and density is caused by the change of porosity and tortuosity of the laterite. Therefore, we suggest that a suitable density should be adopted while using the laterite to effectively cover uranium tailings or economically produce building materials that can curb the radon exhalation. © 2017 Elsevier Ltd

语种： 英文

作者： Fang, Qi*;Li, Yilian;Peng, Guojian;Cheng, Peng;Lv, Junwen

期刊： Environmental Earth Sciences,2016年75(18):1-13 ISSN：1866-6280

通讯作者： Fang, Qi

作者机构： [Fang, Qi; Lv, Junwen] Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.;[Li, Yilian] China Univ Geosci, Sch Environm Studies, Wuhan 430074, Peoples R China.;[Peng, Guojian] Univ South China, Sch Comp Sci & Technol, Hengyang 421001, Peoples R China.;[Cheng, Peng] Team 217 Hunan Nonferrous Geol Explorat Bur, Hengyang 421001, Peoples R China.

通讯机构： [Fang, Qi] U;Univ South China, Sch Environm Protect & Safety Engn, Hengyang 421001, Peoples R China.

关键词： CO2 geological storage;Mineral sequestration capacity;Feldspar;Salinity;High-salinity aquifers

摘要： Mineral sequestration of CO2 is considered to be the safest mechanism in the long-term storage of CO2 in deep saline aquifers. This study aims to investigate the effect of feldspar and salinity on the mineral sequestration capacity of CO2 in deep high-salinity brine aquifers by taking Jiangling Depression of Jianghan Basin for instance. Numerical simulation on the long-term geochemical reaction and transport was performed by taking TOUGHREACT as the simulation tool. Simulation results indicate that the effect of feldspar on the mineral trapping capacity of CO2 does not depend on the total content of feldspar, but depends on feldspar type and relative content. With Mg-rich minerals such as chlorite or dolomite present, the mineral composition abundant in K-feldspar is less favorable for the mineral sequestration capacity of CO2 for the reason that a large amount of illite precipitates, consuming a lot of Al3+ in the aqueous solution, thereby limiting the precipitation of dawsonite, especially for the high-temperature sedimentary environment. In addition, the effect of salinity on the mineral sequestration capacity of CO2 represents two aspects: one for the longer migration distance due to the lower solubility of higher salinity and the other for CO2 mineral trapping capacity per 1m3 medium which is not in simple decreased with salinity, depending on K-feldspar present or not. For the mineral composition with K-feldspar present, CO2 mineral trapping capacity decreases with salinity, while with albite instead of K-feldspar, it increases with salinity owing to more precipitation of dawsonite. © 2016, Springer-Verlag Berlin Heidelberg.

语种： 英文

作者： Li, Ying;Lv, Changyin*;Sun, Qiang;Zhao, Ying;Li, Yunjing

期刊： ANALYTICAL METHODS,2015年7(1):155-160 ISSN：1759-9660

通讯作者： Lv, Changyin

作者机构： [Li, Ying] Ctr Dis Prevent & Control, Inst Sanit Inspect, Dept Phys & Chem Inspect, Xuzhou, Jiangsu, Peoples R China.;[Li, Ying; Lv, Changyin; Li, Yunjing; Sun, Qiang; Zhao, Ying] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Lv, Changyin] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Lv, Changyin] U;Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

摘要： This study investigated the chromatographic characteristics of irradiated vitamins and their feasibility for dose measurement by using high performance liquid chromatography (HPLC). Water-soluble vitamins in the B family, including thiamine hydrochloride (TH), riboflavin (RF) and nicotinic acid (NA), were used for comparative study. The results showed that riboflavin was sensitive to irradiation, and the content changes of RF were linearly correlated with irradiation doses. Combining the analyses of ultraviolet and fluorescence spectra, the suitable application range for dose determination was confirmed from 100 to 2000 Gy; moreover, the influencing factors were further discussed. The content of RF could maintain good stability before and after irradiation under low-light conditions. These characteristics make it possible for RF to be used as a material for dose measurement. In addition, this work also provides references for irradiation nutrition research due to the favourable separation and analysis characteristics of HPLC. © 2014 The Royal Society of Chemistry.

语种： 英文

作者： Li, Ying;Lv, Changyin*;Zhao, Ying;Sun, Qiang;Li, Yunjing

期刊： Analytical Sciences,2013年29(12):1189-1194 ISSN：0910-6340

通讯作者： Lv, Changyin

作者机构： [Li, Ying; Lv, Changyin; Li, Yunjing; Sun, Qiang; Zhao, Ying] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Hengyang 421001, Hunan, Peoples R China.;[Lv, Changyin] Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

通讯机构： [Lv, Changyin] U;Univ South China, Inst Environm & Radiat Med, Sch Publ Hlth, Changsheng Rd, Hengyang 421001, Hunan, Peoples R China.

关键词： Thiamine hydrochloride;radiation dosimeter;high-performance liquid chromatography (HPLC);mass spectrum;1H-NMR spectrum

摘要： This research investigated the ionizing radiation effect on thiamine hydrochloride (TH) and its usability as an irradiation dosimeter. The fundamental principle is to determine the concentration variations of TH solutions with high-performance liquid chromatography (HPLC) after exposing to γ-rays. The decreasing peak area of TH in the HPLC chromatogram forms a linear relationship with the rising radiation dose. We investigated the characteristics and suitable application range of the TH as a new radiation dosimeter. The influence factors and mechanism of the reaction induced by radiation were also discussed. According to the correlation between the concentration and the radiation dose, 0.3 g/L of a TH solution is suitable for the 0.1 - 10 kGy dose range, and 2 g/L is appropriate for 0.1 - 20 kGy. The easy availability and the simple, but stable, chemical structure of thiamine makes it a potential candidate for radiation dose research. Also, the preparation proceeding for sampling is easy, and the result can be automatic monitored by liquid chromatography. ©The Japan Society for Analytical Chemistry.

语种： 英文