Overview
Maikanov et al. measured amino-acid composition, heavy metal salts, and radionuclides in fish muscle from the Shuchinsk-Burabay resort zone in Kazakhstan. The wishlist filename targeted poultry cadmium, but the actual paper is fish occurrence evidence and was ingested under the actual paper identity.
Key numbers
The abstract and discussion report maximum mean concentrations of heavy metal salts in fish muscle as 0.0590 mg/kg for total arsenic, 0.0050 mg/kg for cadmium, and 0.0350 mg/kg for lead. Table 4, however, lists Crucian carp (n=4) at 0.0600 ± 0.0040 mg/kg total arsenic, so the paper’s own narrative understates its tabulated maximum by one species. Per-species Table 4 means (mg/kg, wet weight, ± SD): Carp (n=8) As 0.0167 ± 0.0083, Cd 0, Hg 0.0201 ± 0.0100, Pb 0.0257 ± 0.0110; Rudd (n=12) As 0.0590 ± 0.0147, Cd 0, Hg 0.0250 ± 0.0043, Pb 0.0350 ± 0.0043; Perch (n=17) As 0.0305 ± 0.0056, Cd 0.0050 ± 0.0014, Hg 0.0385 ± 0.0062, Pb 0.0250 ± 0.0014; Crucian (n=4) As 0.0600 ± 0.0040, Cd 0, Hg 0.0070 ± 0.0090, Pb 0.0100 ± 0.0004. Cadmium was below detection in all non-perch species. The paper’s stated Kazakh maximum permissible concentrations are As 0.1, Cd 0.05, Hg 0.03, Pb 0.5 mg/kg.
Perch muscle mercury at 0.0385 mg/kg exceeded the paper’s cited Hg MPC of 0.03 mg/kg by 28.3% (paper rounds to 28%). The paper’s discussion states “mercury concentration in the other fish samples was not higher than 0.07 mg/kg,” but Table 4 shows non-perch species means at or below 0.0250 mg/kg, well below the 0.07 mg/kg statement; the 0.07 figure appears to be a stray narrative datum without table support.
Methods (brief)
Forty-four fish samples in total were collected from four lakes and divided by species; the heavy-metals analysis covered 41 (Carp, Rudd, Perch, Crucian). Arsenic, cadmium, mercury, and lead were measured by inductively coupled plasma mass spectrometry on an Agilent Technologies 7700 Series ICP-MS after pressure mineralization, following a laboratory standard operating procedure based on British BS EN 15763:2009. The paper states ICP-MS measurement ranges of 0.06-21.5 mg/kg for As, 0.03-28.3 mg/kg for Cd, 0.04-0.56 mg/kg for Hg, and 0.01-2.4 mg/kg for Pb. The reported Hg means for Carp (0.0201 mg/kg) and Crucian (0.0070 mg/kg) fall below the stated 0.04 mg/kg Hg lower measurement bound, so those values should be treated as near or below the method’s reported sensitivity for Hg. Amino-acid composition was measured by liquid chromatography (Shimadzu LC-20 Prominence); cesium-137 was measured by gamma spectrometry (spectrometric complex Progress) per GOST 32161-2013, with all fish-sample Cs-137 activities well below the 130 Bq/kg permissible level.
Implications
This source supports freshwater fish and general seafood context for Kazakhstan resort-zone fish. It should not be routed to poultry despite the wishlist filename. Total arsenic and total mercury are not iAs or MeHg.
Related evidence
- Fresh Fish
- Fish — freshwater (tilapia, catfish, trout)
- Seafood
- Fish
- Freshwater Fish
- Mercury
- Arsenic
- Cadmium
- Lead
Update history
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