Abundance, size distribution and dissolved organic matter binding of arsenic in reducing aquifer

Sun, Y.Q.1,2; Lin, H.3; Han, S.B.4; Sun, J.5; Ma, M.1,2; Guo, L.D.3; Zheng, Y.2

10.1201/9781351046633-31

2018

1876-6218

7th International Congress and Exhibition Arsenic in the Environment, 2018

79-80

Beijing, China

PO BOX 11320, LEIDEN, 2301 EH, NETHERLANDS

CRC Press/Balkema

The interactions between As and dissolved organic matter (DOM) have significant impacts on the environmental behavior of As. Among various interactions, the binary complexes of As bound to DOM and ternary complexes of As bound to DOM with iron (Fe) bridging, are critical to mobility, speciation, toxicity and bioavailability of As. Flow field flow fractionation (FlFFF) offline with high-resolution inductively coupled plasma mass spectroscopy (HR-ICPMS) were utilized to elucidate the As, Fe and DOM complexation in high arsenic, reducing groundwater from Yinchuan plain. The majority (>70%) of As was truly dissolved with molecular size <0.5 nm; while 13% of As and 37% of Fe were bound to colloidal DOM with molecular size between 16–64 nm. The results imply that As-Fe-DOM complex is distributed as moderately large colloids with molecular size between 16–64 nm. However, artefacts due to changes occurring during sample storage and transportation cannot be ruled out. Thus, field ultrafiltration under N2 atmosphere will be employed in the future to validate FIFFF results.
© 2018, CRC Press/Balkema. All rights reserved.

其他

英语

CPCI-S ; EI

National Natural Science Foundation of China[41772265]

Environmental Sciences & Ecology ; Public, Environmental & Occupational Health

Environmental Sciences ; Public, Environmental & Occupational Health

WOS:000507999600031

20200708163172

Aquifers ; Biogeochemistry ; Colloids ; Dissolution ; Groundwater resources ; Inductively coupled plasma ; Liquid chromatography ; Mass spectrometers ; Mass spectrometry ; Organic compounds

Groundwater:444.2 ; Chemistry:801 ; Chemical Operations:802.3 ; Organic Compounds:804.1 ; Plasma Physics:932.3

Web of Science

1.College of Engineering, Peking University, Beijing, China
2.School of Environmental Science and Technology, Southern University of Science and Technology, Shenzhen, China
3.School of Freshwater Sciences, University of Wisconsin-Milwaukee, WI, United States
4.Center for Hydrogeology and Environmental Geology Survey, China Geological Survey, Baoding, China
5.School of Earth Sciences, University of Western Australia, Perth; WA, Australia

Sun, Y.Q.,Lin, H.,Han, S.B.,et al. Abundance, size distribution and dissolved organic matter binding of arsenic in reducing aquifer[C]. PO BOX 11320, LEIDEN, 2301 EH, NETHERLANDS:CRC Press/Balkema,2018:79-80.