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Determination of polyethylene microplastics toxicity by microalgae Scenedesmus sp.
Summary
This study investigated the toxicity of polyethylene microplastics on the freshwater microalgae Scenedesmus sp. Results showed that microplastics inhibited algal growth and photosynthesis, indicating potential harm to aquatic ecosystems.
Industrijski napredak donio je važan polimerni materijal, plastiku. Zbog masovne proizvodnje i korištenja te nepravilnog upravljanja i zbrinjavanja, onečišćenje plastikom danas je postalo jedno od najvažnijih ekoloških pitanja u svijetu. Procesima razgradnje, plastika se raspada na manje čestice zvane mikroplastikom (MP) veličine 1 μm do 5 mm. Kako bi se poboljšala spoznaja o stupnju onečišćenja plastikom, njenom transportu, distribuciji i toksičnosi u okolišu potrebno je hitno riješiti nedostatke u znanju vezano za nju. U ovom radu se provelo ekotoksikološko istraživanje utjecaja MP-a polietilena (PE) na slatkovodnu mikroalgu Scenedesmus sp.. Mikroalga se izlagala različitim veličinama i koncentracijama PE-a kako bi se utvrdilo koliko je ova vrsta MP-a štetna za Scenedesmus sp. Rasponi veličina čestica su iznosili <300 μm; 300 μm do 500 μm i 500 μm do 710 μm pri koncentracijama od 50 mg/L; 250 mg/L; 500 mg/L; 750 mg/L i 1000 mg/L. Provedena istraživanja ukazuju da različite koncentracije i veličine MP-a imaju različit utjecaj na mikroalge. Najveća uočena inhibicija rasta mikroalge Scenedesmus sp., 12,99%, se pojavila kod najmanje veličine čestica, <300 μm, pri koncentraciji od 1000 mg/L. Uočeno je da su koncentracija i veličina čestica značajni parametri u ekotoksikološkim istraživanjima jer direktno utječu na inhibiciju.
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