Calcium-ammonium exchange experiments on clay minerals using a (45)Ca tracer technique in marine pore water.
Understanding cation exchange processes is important for evaluating early diagenetic and synsedimentary processes taking place in marine sediments. To quantify calcium (Ca) exchange and Ca-ammonium exchange in a seawater environment, we performed experiments with a radioactive (45)Ca tracer on clay mineral standards (Fithian illite, montmorillonite and kaolinite) and marine sediments from the North Atlantic Integrated Ocean Drilling Program Site U1306A in artificial seawater (ASW). The results show that equilibrium during the initial attachment of Ca as well as the exchange of Ca by [Formula: see text] is attained in less than 2 min. On average 8-20% of the exchangeable sites of the clay minerals were occupied by Ca in a seawater medium. The conditional selectivity coefficient, describing the [Formula: see text] exchange in ASW is mineral specific and it was determined to be 0.07 for montmorillonite, 0.05 for a natural marine sediment and 0.013 for Fithian illite.
a Institut für Mineralogie, Westfälische Wilhelms-Universität Münster , Münster , Germany.
Charlotte
C
Ockert
Laura M
LM
Wehrmann
Stephan
S
Kaufhold
Tim G
TG
Ferdelman
Barbara M A
BM
Teichert
Nikolaus
N
Gussone
D000538:Aluminum Silicates / Q000737:chemistry*; D064751:Ammonium Compounds / Q000737:chemistry*; D001546:Bentonite / Q000737:chemistry; D002132:Calcium Radioisotopes / Q000032:analysis*; D000077215:Clay; D019015:Geologic Sediments; D007616:Kaolin / Q000737:chemistry; D012623:Seawater / Q000032:analysis* / Q000737:chemistry
D000538:Aluminum Silicates; D064751:Ammonium Compounds; D002132:Calcium Radioisotopes; D001546:Bentonite; D007616:Kaolin; D000077215:Clay