Computer Science
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979gecoa..43.1973n&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 43, Issue 12, pp.1973-1978
Computer Science
1
Scientific paper
The phosphorus content of marine humic acids (HA) is in the range of 0.1-0.2%. The C/P ratios of the HA are 300 to 400. Marine fulvic acids (FA) contain 0.4-0.8% P and have C/P ratios of 80 to 100. High molecular weight organic matter dissolved in pore waters (DOM) contains 0.5% P and has C/P of 90. The data suggest that during the formation sequence: Plankton DOM FA HA Kerogen, phosphorus is lost, mainly in the FA HA (and possibly also in the HA Kerogen) step. Diagenesis of sedimentary humic acids is accompanied by loss of phosphorus (as well as of nitrogen) to form HA with C/P ratios of 1000. Soil humic substances resemble marine humates in P content (0.3%) and soil FA's are about three to fivefold enriched in P relative to HA. C/P ratios are lower in soil HA ( ca . 200) as compared with marine HA. Humic acids from diagenetic products such as peat and lignite are highly depleted in P. Rough calculations indicate that humate bound P may account for 20-50% of the organic phosphorus reservoir in sediments. The chemical speciation of this P is unknown, but lack of correlation with ash, Fe, Ca or Al content (in marine humates, at least) indicates that it is organically bound.
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