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The cycling of iodine as iodate and iodide in a tropical estuarine system

1990; Elsevier BV; Volume: 29; Linguagem: Inglês

10.1016/0304-4203(90)90007-y

1872-7581

Angela de Luca Rebello, Friedrich Wilhelm Herms, K. Wagener,

Radioactive contamination and transfer

The concentration of iodate and iodide were independently determined in seawater samples from Guanabara Bay (Rio de Janeiro, Brazil) taken at depths from 0.15 to 5 m (which was almost the bottom), at various times of day and in three different seasons. The ratio of the two species varied between 0.3 and 3.9, and their concentrations changed at rates of the order of 10 μM h−. This is about two orders of magnitude faster than can be expected from fluxes from sediments. These rates of variation were highly correlated with biological parameters such as the rates of photosynthesis and respiration, and concentration of phytoplankton. A model is presented which explains the diurnal cycling of iodine by biological activity, in agreement with the observed phenomena.