Engbrodt, R. Alfred Wegener Institute for Polar and Marine Research, rengbrodt@awi-bremerhaven.de
Bussmann, I. Alfred Wegener Institute for Polar and Marine Research, ibussman@awi-bremerhaven.de
Kattner, G. Alfred Wegener Institute for Polar and Marine Research, gkattner@awi-bremerhaven.de

 
REACTIVITY AND SELECTIVITY OF XAD RESINS FOR THE EXTRACTION OF POLAR MARINE HUMIC SUBSTANCES
 
Dissolved organic matter in the ocean is one of the major pools of organic carbon in the biosphere and as such it has a great influence to the global carbon cycle. However, a bigger part of the DOM is very recalcitrant with slow turnover times. One way to separate this recalcitrant part is the extraction with XAD-resins to finally gain marine humic substances. In Fram Strait, located between Svalbard and Greenland, with its intensive exchange of Arctic and Atlantic water masses, humic substances (HS) were extracted with XAD resins -2 and -4 from surface water (<100 m) and deep water (>1000 m). The distribution of organic matter based on DOC of the acidic and neutral fractions of each resin was determined. Looking at the percentages of HS out of the total DOC revealed that in surface waters 43% of the total DOC were recovered as HS, while in deep water up to 71% of the DOC were found as HS. The various carbon content, as well as the carbohydrate distribution in the different fractions and different water depths is discussed.
 
Day: Tuesday, Feb. 2
Time: Poster
Location: Sweeney Center
 
Code: SS34TU0679S