@conference{
author = "Stevanović, Marija and Jovanović, Aleksandar and Đolić, Maja and Veličković, Zlate and Čutović, Natalija and Tomašević, Anđelka and Marinković, Aleksandar",
year = "2021",
abstract = "Pesticides are substances designed to protect plants
from various types of diseases and pests [1]under UV irradiation
is studied using synthesized Zinc oxide (ZnO.
Synthetic organic pesticides, in addition to the high
efficiency, have led to frequent adverse environmental
impact, as a consequence of their high accumulation
and toxicity. Due to the increased pollution of water
with mixture pesticides, it is necessary to use different
processes for their removal and degradation. Therefore,
oxidative processes have been developed, commonly
named as Advanced Oxidation Processes (AOPs).
Among them, special attention was attributed to photocatalysis,
as a process that enables the degradation
of difficult-to-decompose organic molecules under the
action of UV radiation in the presence of catalysts [2].
In this study the photocatalytic degradation of thiophanate-
methyl (TM) in the presence of the TiO2 Degussa
P-25 catalyst was investigated. Different experimental
conditions were varied, such as the concentration of
the pesticide solution, the mass of the catalyst and the
influence of the anions (chloride, sulphate, nitrate, etc.).
The pesticide concentration in the reaction system was
monitored based on the decrease in system absorbance
using a Shimadzu 1800 UV spectrophotometer. For optimized
conditions of complete photodegradation, the
environmental acceptability of the defined degradation
process was examined. The toxic effect of the TM solution
before and after degradation was examined using
the embryotoxicity test with Danio rerio, in order to
prove the reduction of toxicity and the success of the
degradation process [3]which raises the issue of potential
influence of different formulation types on herbicide
toxicity. The present study evaluated the toxicity and
teratogenic effects of the active ingredient clomazone
and its two formulations (Rampa® EC and GAT Cenit
36 CS, both containing 360 g a.i./l of clomazone.
Comparing the obtained results of the influence of
ions on the processes of photocatalysis, it was noticed
that all ions have catalytic effects on the kinetics of the
degradation process of TM. The presence of sulphates
and carbonates had the greatest catalytic effect, while
hydrogen phosphates and bicarbonates showed the lowest
catalytic capacity.
The optimal experimental conditions were obtained
using 0,2 g/L of TiO2 and 5 mg/L of TM solution. In
addition, the embryotoxicity test followed the analytical
examination. Comparison of results obtained in embryotoxicity
assay testing of the initial solution, partly
and completely degraded samples confirmed suitability
of applied degradation method. Increase in toxicity,
compared to the initial solution, was registered in partly
degraded sample. This observation can be attributed to
increase in concentration of carbendazim (TM metabolite)
more toxic than parent substance. Finally, completely
degraded sample caused no mortality or adverse
effects in D. rerio embryos after 120 h exposure. Toxicity
of samples, in decreasing order is half degraded >
initial >completely degraded sample.
Based on the obtained results it can be concluded
that used photocatalytic degradation process can be successfully
applied in pesticide contaminated water management.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "21th European Meeting on Environmental Chemistry EMEC 21",
title = "The Embryotoxic Potential and Photocatalytic Degradation of Thiophanate-Methyl",
pages = "42-42"
}
