Abundance and Chemical Speciation of Phosphorus in Marine Surface Sedimentof the Inner Gulf of Thailand
Abstract
Marine sediment is an important source of phosphorus (P). The fate of P in sediments is mostly controlled by the reactivity of different forms of P. The purpose of this study was to quantify the abundance and form of this element in surface marine sediment of the inner Gulf of Thailand. Surface sediment samples were collected from 10 stations in July (SW monsoon) and December (NE monsoon) 2017. The results showed that total P concentration in surface marine sediments ranged from 4.41 to 17.84 and 2.74 to 16.28 mol g-1respectively which varied inversely to water depth. Inorganic P was the dominant P form in surface marine sediment with a mean value of 67.0 + 0.13 % and 59.5 + 0.12 % of total P and might be released to water and consequently influence the primary producer in the inner Gulf of Thailand. Molar ration of TOC/organic P ranged from 1061 to 800 with a mean value of 781.5 and 768.2. Based on these ratios, organic matter obtained from the sediment samples suggested a mixing between terrestrial origin and phytoplankton in the sea.
Keywords : Phosphorus form ; Marine sediment ; Inner Gulf of Thailand
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