Article

Stable isotope-guided analysis of biomagnification profiles of arsenic species in a tropical mangrove ecosystem.

Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
Marine pollution bulletin (impact factor: 2.63). 04/2011; 63(5-12):124-34. DOI:10.1016/j.marpolbul.2011.03.002 pp.124-34
Source: PubMed

ABSTRACT We performed stable carbon and nitrogen-guided analyses of biomagnification profiles of arsenic (As) species, including total As, lipid-soluble As, eight water-soluble As compounds (arsenobetaine (AB), arsenocholine (AC), tetramethylarsonium ion (TETRA), trimethylarsine oxide (TMAO), dimethylarsinic acid (DMA), monomethylarsonic acid (MMA), arsenate (As[V]), and arsenite (As[III])), and non-extracted As in a tropical mangrove ecosystem in the Ba Ria Vung Tau, South Vietnam. Arsenobetaine was the predominant As species (65-96% of water-soluble As). Simple linear regression slopes of log-transformed concentrations of total As, As fractions or individual As compounds on stable nitrogen isotopic ratio (δ15N) values are regarded as indices of biomagnification. In this ecosystem, lipid-soluble As (slope, 0.130) and AB (slope, 0.108) were significantly biomagnified through the food web; total As and other water-soluble As compounds were not. To our knowledge, this is one of the first reports on biomagnification profiles of As compounds from a tropical mangrove ecosystem.

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Keywords

Arsenobetaine
 
Ba Ria Vung Tau
 
biomagnification profiles
 
dimethylarsinic acid
 
ecosystem
 
first reports
 
food web
 
fractions
 
log-transformed concentrations
 
MMA
 
monomethylarsonic acid
 
nitrogen-guided analyses
 
Simple linear regression slopes
 
stable carbon
 
stable nitrogen isotopic ratio
 
tetramethylarsonium ion
 
trimethylarsine oxide
 
tropical mangrove ecosystem
 
water-soluble
 
water-soluble As
 

Nguyen Phuc Cam Tu