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Sampling efficiency of a polyurethane foam air sampler:Effect of temperature

Environmental Science and Ecotechnology 2024年第2期18卷 43-52页

作者： Qiu-Liang Cai Cen-Yan Huang Lei Tong Ning Zhong Xiao-Rong Dai Jian-Rong Li Jie Zheng Meng-Meng He Hang Xiao Key Laboratory of Urban Environment and Health Ningbo Observation and Research StationInstitute of Urban EnvironmentChinese Academy of SciencesXiamen361021China Key Laboratory of Ecological Environment Analysis and Pollution Control in Western Guangxi Region College of Agriculture and Food EngineeringBaise UniversityBaise533000China College of Biological and Environmental Sciences Zhejiang Wanli UniversityNingbo315100China Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control CAS Haixi Industrial Technology Innovation Center in BeilunNingbo315830China Minnan Normal University Zhangzhou363000China

Effective monitoring of atmospheric concentrations is vital for assessing the Stockholm Convention's effectiveness on persistent organic pollutants(POPs).This task,particularly challenging in polar regions due to low air concentrations and temperature fluctuations,requires robust sampling ***,the influence of temperature on the sampling efficiency of polyurethane foam discs remains *** we employ a flow-through sampling(FTS)column coupled with an active pump to collect air samples at varying *** delved into breakthrough profiles of key pollutants,such as polycyclic aromatic hydrocarbons(PAHs),polychlorobiphenyls(PCBs),and organochlorine pesticides(OCPs),and examined the temperature-dependent behaviors of the theoretical plate number(N)and breakthrough volume(VB)using frontal chromatography *** findings reveal a significant relationship between temperature dependence coefficients(KTN,KTV)and compound volatility,with decreasing values as volatility *** distinct trends are noted for PAHs,PCBs,and OCPs in KTN,KTV values exhibit similar patterns across all ***,we establish a binary linear correlation between log(VB/m3),1/(T/K),and N,simplifying breakthrough level estimation by enabling easy conversion between N and ***,an empirical linear solvation energy relationship incorporating a temperature term is developed,yielding satisfactory results for N at various *** approach holds the potential to rectify temperature-related effects and loss rates in historical data from long-term monitoring networks,benefiting polar and remote regions.

关键词： Temperature Theoretical plate number breakthrough volume Frontal chromatographic theory LSER

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Arsenite Removal from Simulated Groundwater by Biogenic Schwertmannite: A Column Trial

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Pedosphere 2013年第3期23卷 402-408页

作者： XIE Yue ZHOU Li-Xiang Department of Environmental Engineering College of Resources and Environmental Sciences Nanjing Agricultural University

To assess the feasibility of biogenic schwertmannite to act as a sorbent for removing arsenite from groundwater, a series of biogenic schwertmannite-packed column adsorption experiments were conducted on simulated As（III）-containing groundwater. Empty bed contact time （EBCT）, As（III） concentration in effluent, and the removal efficiency of As（III） through the column were investigated at pH 8.0 and temperature 25 ± 0.5 ℃. The results showed that the breakthrough curves were mainly dependent on EBCT values when the influent As（III） concentration was 500 μg L-1 and the optimum EBCT was 4.0 min. When the effluent As（III） concentration reached 10 and 50 μg L-1, the breakthrough volumes for the schwertmannite adsorption column were 4200 and 5600 bed volume （BV）, with As（III） adsorption capacity of 2.1 and 2.8 mg g-1, respectively. Biogenic schwertmannite could be regenerated by 1.0 mol L-1 NaOH solution, and more than 80% of As（III） adsorbed on the surface of schwertmannite could be released after 3 successive regenerations. The breakthrough volume for the regenerated sehwertmannite-packed column still maintained 4 000-4 200 BV when the As（III） concentration in effluent was below 10 μg L-1. Compared with other sorbents for As（III） removal, the biogenic schwertmannite- packed column had a higher breakthrough volume and a much higher adsorption capacity, implying that biogenic schwertmannite was a highly efficient and potential sorbent to purify As（III）-contaminated groundwater.

关键词： adsorption capacity As(III) breakthrough volume empty bed contact time sorbent

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