期刊
WATER RESEARCH
卷 133, 期 -, 页码 264-271出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2018.01.048
关键词
Phosphorus; Molecular weight distribution; Size exclusion chromatography; Dissolved organic carbon; ICP-MS
资金
- National Science Foundation, Central Arizona-Phoenix Long-Term Ecological Research (CAP LTER) [DEB-1637590]
Phosphorus (P) is an important and often limiting element in terrestrial and aquatic ecosystem. A lack of understanding of its distribution and structures in the environment limits the design of effective P mitigation and recovery approaches. Here we developed a robust method employing size exclusion chromatography (SEC) coupled to an ICP-MS to determine the molecular weight (MW) distribution of P in environmental samples. The most abundant fraction of P varied widely in different environmental samples: (i) orthophosphate was the dominant fraction (93-100%) in one lake, two aerosols and DOC isolate samples, (ii) species of 400-600 Da range were abundant (74-100%) in two surface waters, and (iii) species of 150-350 Da range were abundant in wastewater effluents. SEC-DOC of the aqueous samples using a similar SEC column showed overlapping peaks for the 400-600 Da species in two surface waters, and for >20 kDa species in the effluents, suggesting that these fractions are likely associated with organic matter. The MW resolution and performance of SEC-ICP-MS agreed well with the time integrated results obtained using conventional ultrafiltration method. Results show that SEC in combination with ICP-MS and DOC has the potential to be a powerful and easy-to-use method in identifying unknown fractions of P in the environment. (C) 2018 Elsevier Ltd. All rights reserved.
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