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Suwannee River natural organic matter: Isolation of the 2R101N reference sample by reverse osmosis.
Environ. Eng. Sci. 32, 38-44 (2015)
Suwannee River natural organic matter (SRNOM) is a well-known end member of NOM from an aquatic system, and is a reference material of the International Humic Substances Society (IHSS). In May 2012, an expedition to the Suwannee River to replenish this reference material yielded over 6kg of freeze-dried NOM. The quantity of isolated NOM was unprecedented, easily exceeding the combined recoveries of the standard and reference samples that were collected by the IHSS from the Suwannee River in 1983, 1999, and 2003. The NOM was acquired from 36,890L of filtered river water, which was concentrated 40-fold on-site using two portable reverse osmosis (RO) systems. After RO, the concentrated sample was desalted by cation exchange (CEX), freeze dried, and homogenized. Overall yield of dissolved organic carbon (DOC) was 84.2%, which is slightly lower than the yield of 88% in 1999 when RO and CEX were used to isolate the first sample of SRNOM, which is designated 1R101N. The final NOM sample supplied to the IHSS, which is designated 2R101N, contains only 3.89% inorganic ash, which reasonably allows most chemical analyses. Average river DOC concentration of 82.7mg/L was higher than during prior sampling trips, which contributed to the his- torically high recovery of NOM. Increased DOC concentration may be related to the removal of water control structures from the river. This article describes the methods of isolation used in collecting the 2R101N reference sample as background for other articles in this special issue of Environmental Engineering Science and for future researchers who will use this IHSS sample.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Dissolved Organic Matter ; Ihss ; Natural Organic Matter ; Reverse Osmosis ; Srnom ; Suwannee River; Waters
ISSN (print) / ISBN 1092-8758
Zeitschrift Environmental Engineering Science
Quellenangaben Band: 32, Heft: 1, Seiten: 38-44
Verlag Mary Ann Liebert
Verlagsort New Rochelle
Begutachtungsstatus Peer reviewed
Institut(e) Research Unit Analytical BioGeoChemistry (BGC)