Origin of arsenolipids in sediments from Great Salt Lake
Ronald A. Glabonjat
A D , Georg Raber A , Kenneth B. Jensen A , Florence Schubotz B , Eric S. Boyd C and Kevin A. Francesconi A
+ Author Affiliations
- Author Affiliations
A Institute of Chemistry, NAWI Graz, University of Graz, 8010 Graz, Austria.
B MARUM – Center for Marine Environmental Sciences and Department of Geosciences, University of Bremen, 28359 Bremen, Germany.
C Department of Microbiology and Immunology, Montana State University, Bozeman, MT 59717, USA.
D Corresponding author. Email: ronald.glabonjat@uni-graz.at
Environmental Chemistry 16(5) 303-311 https://doi.org/10.1071/EN19135
Submitted: 10 May 2019 Accepted: 17 June 2019 Published: 19 July 2019
Journal Compilation © CSIRO 2019 Open Access CC BY-NC-ND
Environmental context. Arsenic is a globally distributed element, occurring in various chemical forms with toxicities ranging from harmless to highly toxic. We examined sediment samples from Great Salt Lake, an extreme salt environment, and found a variety of organoarsenic species not previously recorded in nature. These new compounds are valuable pieces in the puzzle of how organisms detoxify arsenic, and in our understanding of the global arsenic cycle.
Abstract. Arsenic-containing lipids are natural products found predominantly in marine organisms. Here, we report the detection of known and new arsenolipids in sediment samples from Great Salt Lake, a hypersaline lake in Utah, USA, using high-performance liquid chromatography in combination with both elemental and molecular mass spectrometry. Sediments from four investigated sites contained appreciable quantities of arsenolipids (22–312 ng As g−1 sediment) comprising several arsenic-containing hydrocarbons and 20 new compounds shown to be analogues of phytyl 2-O-methyl dimethylarsinoyl riboside. We discuss potential sources of the detected arsenolipids and find a phytoplanktonic origin most plausible in these algal detritus-rich salt lake sediments.
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