Naslov
Thallium accumulation in the intestinal tissue, homogenate and cytosol of brown trout and Prussian carp from two Croatian rivers

Autori
Mijošek, Tatjana ; Filipović Marijić, Vlatka ; Dragun, Zrinka ; Krasnići, Nesrete ; Ivanković, Dušica ; Redžović, Zuzana ; Erk, Marijana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
COST ACTION TD 1407 Final Meeting: Book of Abstracts / Filella, Montserrat ; Omanović, Dario ; Dror, Ishai - , 2019, 67-67

Skup
COST ACTION TD 1407, Final meeting: Technology Critical Elements – Sources Chemistry and Toxicology

Mjesto i datum
Zagreb, Hrvatska, 02.04.2019. - 03.04.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Thallium ; intestinal tissue ; cytosols ; fish

Sažetak
Thallium is a rare heavy metal but its high toxicity, water solubility and tendency of bioaccumulation made it a US EPA priority pollutant. It is generally present in the environment at low levels but human impact has increased its content so it should be strictly monitored in the environment. Accordingly, Tl levels were measured in brown trout from the karst Krka River and Prussian carp from the lowland Ilova River, both inhabiting the area affected by the industrial waste outlets. We compared Tl distribution among intestinal tissue, its homogenate and cytosolic fraction since whole tissue concentrations do not necessarily reflect metabolically available and potentially toxic metal levels, but rather the total accumulation. Cytosolic fractions, containing sensitive biomolecules, lysosomes and microsomes, reflect biologically and trophically available metal levels in the organisms. Thallium concentrations were measured by HR ICP-MS in digested tissue, homogenates and cytosols of fish intestine in two seasons (autumn, spring) and two sites (reference, polluted). In all intestinal fractions Tl concentrations were around 20-30 times higher in trout than carp, i.e. 19-47 µg/kg in tissue and homogenate and 9-31 µg/kg in cytosol of brown trout ; 1.2-2.1 µg/kg in tissue and homogenate and 0.5-0.9 µg/kg in cytosol of Prussian carp. Despite these differences, ratio of Tl levels between homogenates and whole tissues was comparable in both species (0.86-1.03). On the other hand, the ratio between cytosolic and total Tl concentrations ranged 0.5-0.7 in brown trout and 0.3-0.5 in Prussian carp depending on the sampling site and/or season. Therefore, Tl is partly present in the metabolically available fraction of fish intestine, which could potentially be toxic. Although Tl concentrations in the river water were comparable between the karst and lowland rivers (4-9 ng/L), Tl bioaccumulation showed species-, season- and site-specific differences.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Biologija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA