Avaliação de potencial de retenção de metais no estuário dos Bons Sinais, através das propriedades e características dos sedimentos do fundo

Abstract

The present work had the objective of evaluating the potential of metal retention in the Bons Sinais Estuary, through the properties and characteristics of the bottom sediments. For this purpose, 5 surface sediment samples of the Bons Signal Estuary located upstream of the estuary at Confluence of the Fishermen's Neighborhood were collected and analyzed. Sediment samples were collected using the van veen bottom sampler and the analyzes were carried out in the IIAM-Nampula soil and plant laboratory, which consisted in the determination of the texture by the pipet method, pH by potentiometric method, organic matter by titration and Cation Exchange Capacity (CEC) by the calcium, magnesium and potential acidity titration, sodium and potassium extraction technique by flame atomic absorption spectrometry in each sediment sample. The results obtained in the analysis of the sediments presented in terms of average values of pH equal to 8.14, 1.98% of organic matter, 0.8% of coarse sand, 34.6% of fine sand, 27.2% of silt and 37.4% of clay, and values of CEC between 13.5 and 36.07 cmolc / kg. These conditions are considered favorable to the retention of the metals in the sediments of the bottom of the studied environment.