Amino acid concentrations in interstitial waters from ODP Sites 113-689 and 113-690 ...

• Main Authors: Kawahata, Hodaka, Ishizuka, Toshio
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2000
• Subjects: Drilling/drill rig; Leg113; Joides Resolution; Ocean Drilling Program ODP; Antarc*; Antarctic; Antarctic Ocean
• Online Access: https://dx.doi.org/10.1594/pangaea.726857; https://doi.pangaea.de/10.1594/PANGAEA.726857

Biogenic calcareous and siliceous sediments were drilled at ODP Sites 689 and 690 on the Maud Rise, Antarctic Ocean. We analyzed dissolved combined amino acids (DCAA) and dissolved free amino acids (DFAA) in interstitial waters in order to characterize the amino acids in dissolved organic matter. The DFAA was predominant over the DCAA in interstitial waters at Sites 689 and 690, which contradicted the previous results from interstitial water and seawater studies. The DCAA in the interstitial waters probably originated from calcareous biogenic debris with less amounts of siliceous debris. Although glutamic acid constituted 41% of the total concentration of DCAA, it accounted for only 1% of the total concentration of DFAA due to the adsorption and/or reaction with biogenic carbonate. Ornithine, a nonprotein amino acid, is a decomposed product of arginine and made up 17 mol% of the total DFAA and. The total hydrolyzable amino acids (=DCAA + DFAA) accounted for 5 to 28% of the dissolved organic carbon (DOC) ... : Supplement to: Kawahata, Hodaka; Ishizuka, Toshio (2000): Amino acids in interstitial waters from ODP Sites 689 and 690 on the Maud Rise, Antarctic Ocean. Geochemical Journal, 34(4), 247-261 ...