Capacity of humic substances to complex with iron at different salinities in the Yangtze River estuary and East China Sea.

ABSTRACT: The iron binding capacities (IBC) of fulvic acid (FA) and humic acid (HA) were determined in the salinity range from 5 to 40. The results indicated that IBC decreased while salinity increased. In addition, dissolved iron (dFe), FA and HA were also determined along the Yangtze River estuary's increasing salinity gradient from 0.14 to 33. The loss rates of dFe, FA and HA in the Yangtze River estuary were up to 96%, 74%, and 67%, respectively. The decreases in dFe, FA and HA, as well as the change in IBC of humic substances (HS) along the salinity gradient in the Yangtze River estuary were all well described by a first-order exponential attenuation model: y(dFe/FA/HA, S) = a₀ × exp(kS) + y₀. These results indicate that flocculation of FA and HA along the salinity gradien

SUBMITTER: Yang R 

PROVIDER: S-EPMC5431113 | biostudies-literature | 2017 May

REPOSITORIES: biostudies-literature