| Popis: |
Substantial quantities of soluble phosphorus are released from natural suspended sediments from the Amazon River, over periods of many days, when such sediments are kept in suspension in seawater or in 0.01 M nitrilotriacetic acid (NTA), a chelator. These results are interpreted, with the help of other chemical analyses, in terms of various physico-chemical forms in which the phosphorus may exist in sediments. Potential availability of the phosphorus to estuarine algae is discussed. Flux calculations indicate that available particulate phosphorus may be as much as 15 times greater than dissolved PO 4 − P (soluble reactive phosphate) during the Amazon rainy season. |
