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第五届全国原子光谱及相关技术学术会议

作者： Heyong Cheng Wenwen Zhang Yuanchao Wang Jinhua Liu College of Material Chemistry and Chemical Engineering Hangzhou Normal University

Graphene oxide(GO) exhibits huge specific surface area and rich π electrons,which facilitate wide applications in sample pretreatment,separation and detection.This work demonstrates GO as stationary phase for high performance liquid chromatography with inductively coupled plasma mass spectrometric detection(HPLC-ICP-MS) in elemental speciation analysis for the first time.As shown in Scheme 1,inorganic mercuric and organomercuric compounds coordinate with thiosalicylic acid(TSA) to form Hg-TSA complexes,which are retained by GO owing to its strong π electron stacking toward TSA.Inorganic anions of arsenic and selenium,and organoarsenicals are electrostatically attracted by aromatic quaternary ammonium cations in mobile phases whereas organoarsenicals can also be drawn by long alkyl groups in quaternary ammonium compounds owing to solvophobic interaction.The aromatic quaternary ammonium compounds are of high affinity to GO because of strong π electron stacking,leading to effective retention of these As/Se anions on the GO based column.

关键词： Graphene oxide Stationary phase metal speciation HPLC-ICP-MS

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metal distribution characteristic of MSWI bottom ash in view of metal recovery

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Journal of Environmental Sciences 2017年第2期29卷 178-189页

作者： Yi Xia Pinjing He Liming Shao Hua Zhang State Key Laboratory of Pollution Control&Resource Reuse Tongji UniversityShanghai 200092China Institute of Waste Treatment and Reclamation Tongji UniversityShanghai 200092China Center for the Technology Research and Training on Household Waste in Small Towns&Rural Area Ministry of Housing and Urban-RuralDevelopment of China(MOHURD)Shanghai 200092China

Bottom ash is the major by-product of municipal solid waste incineration（MSWI）, and is often reused as an engineering material, such as road-base aggregate. However, some metals（especially aluminum） in bottom ash can react with water and generate gas that could cause expansion and failure of products containing the ash; these metals must be removed before the ash is utilized. The size distribution and the chemical speciation of metals in the bottom ash from two Chinese MSWI plants were examined in this study, and the recovery potential of metals from the ash was evaluated. The metal concentrations in these bottom ashes were lower than that generated in other developed countries. Specifically, the contents of Al,Fe, Cu and Zn were 18.9–29.2, 25.5–32.3, 0.7–1.0 and 1.6–2.5 g/kg, respectively. Moreover,44.9–57.0 wt.% of Al and 55.6–75.4 wt.% of Fe were distributed in bottom ash particles smaller than 5 mm. Similarly, 46.6–79.7 wt.% of Cu and 42.9–74.2 wt.% of Zn were concentrated in particles smaller than 3 mm. The Fe in the bottom ash mainly existed as hematite, and its chemical speciation was considered to limit the recovery efficiency of magnetic separation.

关键词： Municipal solid waste incineration Bottom ash metal speciation metal recovery Size distribution

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Free cupric ions in contaminated agricultural soils around a copper mine in eastern Nanjing City, China

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Journal of Environmental Sciences 2006年第5期18卷 927-931页

作者： LUO Xiao-san ZHOU Dong-mei WANG Yu-jun State Key Laboratory of Soil and Sustainable Agriculture Institute of Soil Science Chinese Academy of Sciences Nanjing 210008 China Graduate School of the Chinese Academy of Sciences Beijing 100039 China

To determine the environmental free metal ion activity was a recent hot issue. A method to measure low-level free cupric ion activity in soil solution extracted with 0.01 mol/L KNO3 was developed by using cupric ion-selective electrode （ISE） and calibrating with Cu-buffer solution. Three copper buffers including iminodiacetic acid （IDA）, ethylenediamine （EN）, and glycine （Gly） were compared for calibrating the Cu-ISE curves in the range of free cupric ions （pCu^2＋） 7-13. The Cu-EN buffer showed the best electrode response and thus was applied as the calibration buffer. The pCu^2＋ of 39 contaminated agricultural soils around a copper mine was measured, ranging from 5.03 to 9.20. Most Cu in the soil solutions was found to be complexed with dissolved soil organic matters, averaging 98.1%. The proportion of free Cu^2＋ ions in the soil solutions decreased with the increasing of solution pH. Soluble Cu and free Cu^2＋ ions concentrations were analyzed by multiple linear regressions to evaluate the effects of soil properties on metal levels and speciation. The results showed that soil solution pH was the most significant factor influencing pCu^2＋（with R^2 value of 0.76）, while not important for the soluble Cu concentration.

关键词： copper ion selective electrode （Cu-ISE） free metal ion activity soil solution metal speciation bioavailability

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