Genesis of structural features of humic acids from the sediments of a high productive coastal zone

The study of phosphorous dynamics in mangrove ecosystems of the northern Kerala coast aims to delineate its relationships with other biogeochemical parameters. Our intension is to check the validity of the hypothesis that these mangrove ecosystems act as an efficient trap of organic phosphorous by acting as P sink. The dissolved inorganic phosphate displayed higher concentration in monsoon that could be correlated with higher P leaching from mangrove litter as well as terrigenous input during wet season. Fe(OOH)≈P was much higher in monsoon (235.23 to 557.70 μg g(-1)) and lower in pre-monsoon (36.50 to 154.97 μg g(-1)), and displayed significant contribution towards the inorganic sedimentary P fractions. In monsoon, adsorption of P on iron hydroxides is enhanced by fresh water conditions, but pre-monsoon is characterised by the reductive dissolution of iron oxy hydroxides and the subsequent efflux of P to water column. CaCO3≈Pinorg may be present as an inert fraction in the sediment matrix, and did not display any interrelationship with other geochemical parameters. The abundant total organic P (25 to 73 %) fractions, largely derived from P bound with humic/fulvic acid, played a major role in immobilising P and regulating its dynamics in the nearby estuarine and coastal environment.

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Phosphorous fractionation in mangrove sediments of Kerala, south west coast of India: the relative importance of inorganic and organic phosphorous fractions

Resmi

Manju

Gireeshkumar

et al. 2016

Environ Monit Assess

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Effects of molecular-level component variation of fulvic acid on photodegradation of Microcystin-LR under solar irradiation

Sun

Wang²,

Yin³

et al. 2022

Chemical Engineering Journal

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Photochemical behavior of dissolved organic matter in environmental surface waters: A review

Xu,

Zhang,

Qiu

et al. 2024

Eco-Environment & Health

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Genesis of structural features of humic acids from the sediments of a high productive coastal zone

Cited by 5 publications

References 60 publications

Phosphorous fractionation in mangrove sediments of Kerala, south west coast of India: the relative importance of inorganic and organic phosphorous fractions

Phosphorous fractionation in mangrove sediments of Kerala, south west coast of India: the relative importance of inorganic and organic phosphorous fractions

Effects of molecular-level component variation of fulvic acid on photodegradation of Microcystin-LR under solar irradiation

Photochemical behavior of dissolved organic matter in environmental surface waters: A review

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