Chemical speciation of arsenic in different marine organisms: Importance in monitoring studies

Overview

Fattorini and colleagues measured total arsenic and arsenic species in marine organisms collected from Cienfuegos Bay, Cuba, after an accidental release of 3.7 tons of arsenic as arsenate oxides from a nitro-fertilizer factory. The source includes fish muscle, crustaceans, and algae; this page routes the fish and crustacean results as seafood occurrence context and treats the algae rows as environmental context only. Arsenic speciation is load-bearing here: the paper reports both total arsenic and inorganic arsenic percentages in selected fish and crustacean rows.

Key numbers

Table 1 reports total arsenic as µg/g d.w. mean values with standard deviations. Chemical-speciation percentages are reported only for selected species rows.

The abstract summarizes the fish finding as arsenic concentrations up to 500 µg/g d.w. and says inorganic species were the predominant forms in muscle tissues of fish from the more impacted site. In the Results text, Lutjanus synagris from Corona is described as about 12 µg/g, while the same species from Bahia is described as about 500 µg/g total arsenic with inorganic forms around 98%. The paper states that crustacean tissue arsenic concentrations were between 13 and 25 µg/g, with about 95% occurring as organic AsB or AsC forms.

The algae rows in Table 1 are not routed as food occurrence because the source describes them as monitoring organisms, not edible seaweed products. They report total arsenic values of Dictyota sp. 8.57 +- 0.75, Laurencia papillosa 10.14 +- 0.68, and Hypnea spinella 4.98 +- 0.51 µg/g d.w..

Methods (brief)

Samples were collected from Cienfuegos Bay 15 days after the December 2001 arsenic release. The analyzed species included algae, crustaceans, and fish; fish were analyzed as muscle tissue. Approximately 500 mg of lyophilized tissue was extracted with 5 ml methanol using microwave digestion before ion-exchange HPLC separation. Fractions were measured by graphite-furnace AAS with Zeeman background correction. Separate nitric-acid digestion quantified total arsenic. DORM-2 dogfish muscle reference material was used to check speciation and total arsenic results.

Implications

This source provides seafood arsenic occurrence context under an acute contamination scenario, especially for fish muscle in Bahia where total arsenic and inorganic arsenic percentages were both high. It should not be pooled silently with market-basket seafood benchmarks because the samples were collected immediately after a known industrial release. Downstream use should keep total arsenic and inorganic arsenic separate, and should treat algae rows as environmental monitoring context unless a later routing pass establishes edible-seaweed relevance.

Update history

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