TOXICITY DETERMINED BY THE USE OF AGROCHEMICALS IN ORGANISMS INDICATORS OF WATER QUALITY

Authors

DOI:

https://doi.org/10.5327/Z2176-947820190466

Keywords:

herbicide; insecticide; environmental bioindicator; toxicology.

Abstract

The expansion of agricultural frontiers has promoted the increase of cultivated
areas and the use of agrochemicals; concerns about their destination have
been manifested, mainly by the exposure to which water bodies are submitted.
Admitting the concern, the objective was to evaluate the degree of toxicity,
determined by the use of pesticides glyphosate, atrazine and imidacloprid, in
organisms that indicate water quality. For this, sensitivity and d/efinitive tests
were carried out using dafinids (Daphnia magna). Sensitivity tests showed
an EC50 of 0.77 mg.L-1, attesting to its use and that recommended by ISO
6341. For the final tests and concentrations tested, an EC50 was found for
glyphosate of 27.4 mg.L-1, for atrazine an EC50 of 8.1 mg.L-1 and 217.1 mg.L-1
for imidacloprid. As a deleterious effect, it was observed that after the tests,
the immobile organisms presented deformations in the carapaces and in the
digestive tract. Among the properties of the most aggressive pesticides, their
miscibility was highlighted.

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Published

2019-12-30

How to Cite

Nascimento, L. de C., & Naval, L. P. (2019). TOXICITY DETERMINED BY THE USE OF AGROCHEMICALS IN ORGANISMS INDICATORS OF WATER QUALITY. Revista Brasileira De Ciências Ambientais (RBCIAMB), (53), 69–80. https://doi.org/10.5327/Z2176-947820190466