Abstract
Polycyclic aromatic hydrocarbons (PAHs) pollution in mangroves has drawn much attention, but knowledge of the sorption of PAHs in mangrove sediment is limited. This study investigated the particles and water-stable aggregates (WSA) of mangrove sediment in Jiulong River Estuary, China, and the characteristics of anthracene adsorption to them. The adsorption of anthracene was strongly influenced by the physicochemical and structural properties of sediment particles and WSA. The main sorbents of mangrove sediment were carbonized particles and clays. The porous structure of carbonized particles made it easy to sequestrate sequester the anthracene, and the aging allowed anthracene to move into deeper sites of the carbonized particles. Clays had high anthracene-fixing capacities, and they included organic matters and formed aggregates. The sorption contents coefficient Kf of anthracene with WSA of different sizes increased in the order 0.063 - 0.25 mm > 0.063 mm > 0.25 - 1.0 mm > 1.0 mm. The order was correlated with which due to the contents and characteristics of organic matters in the aggregates.
Highlights
This study investigated the particles and water-stable aggregates (WSA) of mangrove sediment in Jiulong River Estuary, China, and the characteristics of anthracene adsorption to them
Polycyclic aromatic hydrocarbons (PAHs) are a group of persistent organic pollutants (POPs) that are ubiquitous in the environment [1] [2]
This study aims at investigating the particles and water-stable aggregates of mangrove sediments and the sorption of a typical PAH, anthracene in these particles and water-stable aggregates
Summary
Polycyclic aromatic hydrocarbons (PAHs) are a group of persistent organic pollutants (POPs) that are ubiquitous in the environment [1] [2]. They have been of particular concern due to their carcinogenicity, mutagenicity and toxicity to bi-. Human activities in coastal areas extremely increased in recent years and made mangroves suffer great environmental pressures [5] [6]. Over the past few decades, mangrove wetlands have been exposed to multiple poisonous PAHs due to various kinds of human activities [7] [8] [9] [10]
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