title: Stable isotope-guided analysis of biomagnification profiles of arsenic species in a tropical mangrove ecosystem.
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.
authors.affiliation: Faculty of Agriculture, Ehime University, Tarumi 3-5-7, Matsuyama, Ehime 790-8566, Japan.
authors.forename: Nguyen Phuc Cam
authors.initials: NP
authors.lastname: Tu
authors.forename: Tetsuro
authors.initials: T
authors.lastname: Agusa
authors.forename: Nguyen Ngoc
authors.initials: NN
authors.lastname: Ha
authors.forename: Bui Cach
authors.initials: BC
authors.lastname: Tuyen
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Tanabe
authors.forename: Ichiro
authors.initials: I
authors.lastname: Takeuchi
mesh_terms: D000818:Animals; D059001:Aquatic Organisms / Q000378:metabolism*; D001152:Arsenicals / Q000032:analysis / Q000378:metabolism*; D032407:Avicennia; D017753:Ecosystem; D004784:Environmental Monitoring / Q000379:methods*; D020387:Food Chain; D009587:Nitrogen Isotopes / Q000032:analysis; D012623:Seawater / Q000737:chemistry; D014744:Vietnam; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D053833:Wetlands
chemical_list: D001152:Arsenicals; D009587:Nitrogen Isotopes; D014874:Water Pollutants, Chemical