Job 2023 - Metals in Thondi coast commercial fish

Job and colleagues measured arsenic, cadmium, chromium, copper, lead, and zinc in edible muscle from five commercially important fish species associated with the Thondi coast, Palk Bay, India. The fish were randomly collected from the market, and muscle tissue was analyzed by atomic absorption spectroscopy. The source reports arsenic and chromium without speciation; arsenic is therefore total/unspecified As, and chromium is total Cr, not Cr-VI.

Key numbers

Table 1 reports trace-element concentrations in fish muscle in μg/g:

The results section states the following maxima and minima among the five species: tAs highest in Sillago sihama and lowest in Lates calcarifer; Cr highest in Lates calcarifer and lowest in Sillago sihama; Pb highest in Sillago sihama and lowest in Lates calcarifer; Cd highest in Scolopsis bimaculatus and lowest in Lutjanus fulviflamma; Zn highest in Scolopsis bimaculatus and lowest in Lates calcarifer.

Table 3 reports estimated daily intake (EDI) and target hazard quotient (THQ):

The abstract states that tAs, Cu, and Pb were highest in Sillago sihama at 1.2364 +/- 0.12, 1.6102 +/- 0.28, and 1.0103 +/- 0.21 μg/g, respectively; Cd and Zn were highest in Scolopsis bimaculatus at 0.0876 +/- 0.04 and 1.0564 +/- 0.16 μg/g; and Cr was highest in Lates calcarifer at 1.6781 +/- 0.18 μg/g.

Methods (brief)

Water samples were collected from January to April 2022 at the Thondi coast, Palk Bay. Fish species Lates calcarifer, Leiognathus equulus, Lutjanus fulviflamma, Scolopsis bimaculatus, and Sillago sihama were randomly collected from the market and transferred to the laboratory on ice. Muscle tissues were separated, dried at 70 °C, ground, digested with concentrated nitric acid and perchloric acid at a 2:1 ratio, and analyzed for As, Cd, Cr, Cu, Pb, and Zn using Shimadzu 7000 atomic absorption spectroscopy. DORM-4 fish tissue certified reference material was used for validation. The paper reports As and Cr as elements without speciation.

Implications

This source contributes direct edible-fish muscle occurrence data for fresh marine fish from the Thondi coast/Palk Bay market area. It should be routed as mixed marine fish evidence rather than collapsed into a single species row, and the arsenic and chromium values should remain total/unspecified species. The EDI and THQ table is useful exposure context, but the concentration table is the primary occurrence evidence for product routing.

Verification notes

• PDF text extracted with pdftotext -layout; title page, methods, Tables 1-3, discussion, and conclusion were readable.
• DOI 10.1007/s10653-023-01775-6, raw handle MFK_evaluation-of-water-quality-and-bioaccumulation-o, and cite-key checks found no existing source page before creation.
• Table 1 concentration values and Table 3 EDI/THQ values were checked against the extracted text. Units are preserved as μg/g; no conversion was performed.
• Speciation: arsenic was reported as As and chromium as Cr; the page records these as total/unspecified arsenic (tAs) and total chromium (Cr), not iAs or Cr-VI.
• Brand firewall: fish were sampled by species/market context; no brand names were reported.
• Frontmatter product and ingredient slugs were checked against docs/gpt-collaboration/taxonomy-snapshot.md; no new slug was invented.

Page history

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