Primeiro estudo sobre fracionamento de fósforo em sedimentos de supramaré do estuário de Bahía Blanca (Argentina)
DOI:
https://doi.org/10.24215/25456377e121Palavras-chave:
Especiação de fósforo, Extração Sequencial, Planície de Maré, Puerto Rosales,Resumo
Os sedimentos estuarinos desempenham um papel fundamental nos processos de remineralização dos nutrientes; entre eles está o fósforo (P), que é um elemento essencial para a vida. Neste trabalho, foram avaliados os níveis de P em sedimentos da camada superficial (S: 0?5mm de profundidade) e subsuperficial (SS: 5?10mm de profundidade) da planície de maré supramaré baixa de Puerto Rosales (zona média do estuário de Bahía Blanca, Argentina). Por sua vez, são apresentados os primeiros estudos de especiação de P. Foram determinados a composição granulométrica, a porcentagem de umidade e de matéria orgânica, pH, Eh e a temperatura nos sedimentos para avaliar sua relação com as diferentes frações de P analisadas. Os resultados mostraram altos níveis de P total (de até 1,055 mg P g-1 ps) e não houve diferenças significativas entre as camadas, o que reflete a capacidade desses sedimentos em reter o P autóctone e/ou antropogênico. Em geral, o P tendeu a permanecer como P ligado a minerais fosfatados de Ca e/ou como P-refratário ou residual (40% e 35%, e 20% e 31% em S e SS, respectivamente). A composição granulométrica do sedimento favoreceria a retenção do P, enquanto a inundação a afetaria principalmente na fração correspondente ao P-lábil ou adsorvido (11% e 23% para S e SS, respectivamente). A variabilidade observada na proporção aportada pelo P-Fe nas duas camadas parece estar relacionada à dissolução dos PO43- e sua difusão à coluna d'água através da água intersticial.Referências
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