Mineralization of inositol hexaphosphate in aerobic and anaerobic marine sediments: Implications for the phosphorus cycle

Details Mineralization of inositol hexaphosphate in aerobic and anaerobic marine sediments: Implications for the phosphorus cycle Mineralization of inositol hexaphosphate in aerobic and anaerobic marine sediments: Implications for the phosphorus cycle

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.1021s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 5, pp.1021-1026

Computer Science

Scientific paper

Inositol hexaphosphate (IP 6 ) is a significant carrier of organic P in riverine sediments and suspended matter. Its mineralization in coastal sediments was investigated by laboratory experiments under simulated marine environments. Despite being chemically refractory, IP 6 was effectively mineralized to inorganic P by aerobic and anaerobic degradation processes. The extent and rate of IP 6 mineralization were found to be strongly regulated by the redox conditions: under anaerobic conditions, IP 6 decomposed almost completely within 40 days, whereas about 50% of IP 6 remained under aerobic conditions during a 60 days experiment. Most of the IP 6 added to sediment/ seawater mixtures was bound to the sediment particles in both aerobic and anaerobic samples. The soluble fraction of IP 6 in the aqueous phase was, however, depressed under aerobic conditions, which could account for the reduced efficiency of aerobic IP 6 mineralization. These results suggest that terrigenous IP 6 decomposes rapidly under marine environmental conditions and thus may be an important P source in marine ecosystems.

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