TY - JOUR
T1 - Stoichiometry, polarity, and organometallics in solid-phase extracted dissolved organic matter of the elbe-weser estuary
AU - Ksionzek, Kerstin B.
AU - Zhang, Jing
AU - Ludwichowski, Kai Uwe
AU - Wilhelms-Dick, Dorothee
AU - Trimborn, Scarlett
AU - Jendrossek, Thomas
AU - Kattner, Gerhard
AU - Koch, Boris P.
N1 - Publisher Copyright:
© 2018 Ksionzek et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
PY - 2018/9
Y1 - 2018/9
N2 - Dissolved organic matter (DOM) is ubiquitous in natural waters and plays a central role in the biogeochemistry in riverine, estuarine and marine environments. This study quantifies and characterizes solid-phase extractable DOM and trace element complexation at different salinities in the Weser and Elbe River, northern Germany, and the North Sea. Dissolved organic carbon (DOC), total dissolved nitrogen (TDN), Co and Cu concentrations were analyzed in original water samples. Solid-phase extracted (SPE) water samples were analyzed for DOC (DOC SPE ), dissolved organic nitrogen (DON SPE ), sulfur (DOS SPE ) and trace metal ( 51 V, 52 Cr, 59 Co, 60 Ni, 63 Cu, 75 As) concentrations. Additionally, different pre-treatment conditions (acidification vs. non-acidification prior to SPE) were tested. In agreement with previous studies, acidification led to generally higher recoveries for DOM and trace metals. Overall, higher DOM and trace metal concentrations and subsequently higher complexation of trace metals with carbon and sulfur-containing organic complexes were found in riverine compared to marine samples. With increasing salinity, the concentrations of DOM decreased due to estuarine mixing. However, the slightly lower relative decrease of both, DOC SPE and DON SPE (~77%) compared to DOS SPE (~86%) suggests slightly faster removal processes for DOS SPE . A similar distribution of trace metal and carbon and sulfur containing DOM concentrations with salinity indicates complexation of trace metals with organic ligands. This is further supported by an increase in Co and Cu concentration after oxidation of organic complexes by UV treatment. Additionally, the complexation of metals with organic ligands (analyzed by comparing metal/DOC SPE and metal/DOS SPE ratios) decreased in the order Cu > As > Ni > Cr > Co and thus followed the Irving-Williams order. Differences in riverine and marine trace metal containing DOM SPE are summarized by their average molar ratios of (C 107 N 4 P 0.013 S 1 ) 1000 V 0.05 Cr 0.33 Co 0.19 Ni 0.39 Cu 3.41 As 0.47 in the riverine endmember and (C 163 N 7 P 0.055 S 1 ) 1000 V 0.05 Cr 0.47 Co 0.16 Ni 0.07 Cu 4.05 As 0.58 in the marine endmember.
AB - Dissolved organic matter (DOM) is ubiquitous in natural waters and plays a central role in the biogeochemistry in riverine, estuarine and marine environments. This study quantifies and characterizes solid-phase extractable DOM and trace element complexation at different salinities in the Weser and Elbe River, northern Germany, and the North Sea. Dissolved organic carbon (DOC), total dissolved nitrogen (TDN), Co and Cu concentrations were analyzed in original water samples. Solid-phase extracted (SPE) water samples were analyzed for DOC (DOC SPE ), dissolved organic nitrogen (DON SPE ), sulfur (DOS SPE ) and trace metal ( 51 V, 52 Cr, 59 Co, 60 Ni, 63 Cu, 75 As) concentrations. Additionally, different pre-treatment conditions (acidification vs. non-acidification prior to SPE) were tested. In agreement with previous studies, acidification led to generally higher recoveries for DOM and trace metals. Overall, higher DOM and trace metal concentrations and subsequently higher complexation of trace metals with carbon and sulfur-containing organic complexes were found in riverine compared to marine samples. With increasing salinity, the concentrations of DOM decreased due to estuarine mixing. However, the slightly lower relative decrease of both, DOC SPE and DON SPE (~77%) compared to DOS SPE (~86%) suggests slightly faster removal processes for DOS SPE . A similar distribution of trace metal and carbon and sulfur containing DOM concentrations with salinity indicates complexation of trace metals with organic ligands. This is further supported by an increase in Co and Cu concentration after oxidation of organic complexes by UV treatment. Additionally, the complexation of metals with organic ligands (analyzed by comparing metal/DOC SPE and metal/DOS SPE ratios) decreased in the order Cu > As > Ni > Cr > Co and thus followed the Irving-Williams order. Differences in riverine and marine trace metal containing DOM SPE are summarized by their average molar ratios of (C 107 N 4 P 0.013 S 1 ) 1000 V 0.05 Cr 0.33 Co 0.19 Ni 0.39 Cu 3.41 As 0.47 in the riverine endmember and (C 163 N 7 P 0.055 S 1 ) 1000 V 0.05 Cr 0.47 Co 0.16 Ni 0.07 Cu 4.05 As 0.58 in the marine endmember.
UR - https://www.scopus.com/pages/publications/85052865860
U2 - 10.1371/journal.pone.0203260
DO - 10.1371/journal.pone.0203260
M3 - 文章
C2 - 30183724
AN - SCOPUS:85052865860
SN - 1932-6203
VL - 13
JO - PLoS ONE
JF - PLoS ONE
IS - 9
M1 - e0203260
ER -
