Publication Date:
2021-05-19
Description:
One of the possible threats in increasing use of nanomaterials is the emergence of toxicity in humans and other
animals which is discussed in nanotoxicology. In addition to toxic effects of nanomaterials themselves, different
chemical precursors which are usually used in bottom-up approaches for production of nanomaterials may have
secondary toxic effects in living organisms. In contrast, less use of chemicals in top-down approaches may reduce
these secondary effects. To test this hypothesis, toxic effects of two types of silver nanoparticles (AgNPs) produced
by physical (top-down) and chemical (bottom-up) methods were investigated and compared on the tadpole, Rana
ridibunda survival. The estimated 48 h LC50 values of AgNPs produced by chemical and physical methods for
tadpoles were 0.055 ± 0.004 and 0.296 ± 0.085 mg.L-1, respectively. No observed effect concentration, lowest
observed effect concentration, maximum acceptable toxicant concentration and median lethal concentration of
AgNPs produced by chemical method were respectively 3.42, 4.50, 4.84 and 5.38 times less than those produced
by physical method. Therefore, approving the mentioned hypothesis, it was revealed that AgNPs produced by
chemical method are more toxic than those generated by physical method. However, it seems totally that AgNPs
regardless of the method used for their production, have toxic effects on aquatic organisms and so, inhibiting their
accidental or intentional entrance into the aquatic ecosystems should be more considered.
Description:
Published
Keywords:
Rana ridibunda
;
Tadpole
;
Silver Nanoparticles
;
Aquatic Nanotoxicology
;
Amphibian
;
Toxicity
;
Comparison
;
Silver
;
Physical
;
Chemical
;
Methodology
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.383-390
Permalink
