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Annotation. A great danger to the environment and the health of the population is the release of chemical substances of technogenic origin, in particular plant protection products into the atmospheric air. The aim of the study was to evaluate the hazard of harmful inhalation impact on the human body of new pesticides: triazolone herbicide amicarbazone, tricetone herbicide bicyclopyrone, and carboxamide fungicide pydiflumetofen, during their migration from soil to the lower atmospheric air layer. Mathematical modeling of the process of evaporation of the studied pesticides from soil to the atmospheric air was carried out and comparison of the maximum achievable concentrations with the average lethal concentration during acute inhalation exposure and hygienic standards in the air environment. Experimental study of the behavior of amicarbazone, bicyclopyrone, and pydiflumetofen in the "soil - atmospheric air" system was carried out in laboratory conditions. The concentrations of the studied substances in the air were determined by the method of high - performance liquid chromatography. It was established that amicarbazone, bicyclopyrone, and pydiflumetofen are non - volatile under saturated vapor pressure and Henry's law constant, and low - risk by the coefficient of possible inhalation poisoning. Acute inhalation poisoning as a result of evaporation from the soil into the lower atmospheric air layer is unlikely. The maximum achievable concentrations of the studied pesticides that can form in the air as a result of evaporation from the soil are significantly lower than their hygienic standards in the working zone. The migration levels of the studied substances from soil to the lower atmospheric air layer depend on their initial concentrations and the type of soil: bicyclopyrone and pydiflumetofen migrate more intensively from sandy soil than from leached chernozem. Threshold concentrations in the soil according to the air – migration indicator of harmfulness: amicarbazone – 0.05 mg/kg, bicyclopyrone – 1.0 mg/kg and pydiflumetofen – 1.2 mg/kg are formed in the plow layer of soil when researched pesticides are introduced according to 1th, 20th and 20th maximum consumption rates. The “soil - atmospheric air” system is not a leading link to the migration of the studied pesticides in the environment. The obtained results were used in the substantiation of hygienic standard of amicarbazone, bicyclopyrone and pydiflumetofen in soil.
Annotation. A great danger to the environment and the health of the population is the release of chemical substances of technogenic origin, in particular plant protection products into the atmospheric air. The aim of the study was to evaluate the hazard of harmful inhalation impact on the human body of new pesticides: triazolone herbicide amicarbazone, tricetone herbicide bicyclopyrone, and carboxamide fungicide pydiflumetofen, during their migration from soil to the lower atmospheric air layer. Mathematical modeling of the process of evaporation of the studied pesticides from soil to the atmospheric air was carried out and comparison of the maximum achievable concentrations with the average lethal concentration during acute inhalation exposure and hygienic standards in the air environment. Experimental study of the behavior of amicarbazone, bicyclopyrone, and pydiflumetofen in the "soil - atmospheric air" system was carried out in laboratory conditions. The concentrations of the studied substances in the air were determined by the method of high - performance liquid chromatography. It was established that amicarbazone, bicyclopyrone, and pydiflumetofen are non - volatile under saturated vapor pressure and Henry's law constant, and low - risk by the coefficient of possible inhalation poisoning. Acute inhalation poisoning as a result of evaporation from the soil into the lower atmospheric air layer is unlikely. The maximum achievable concentrations of the studied pesticides that can form in the air as a result of evaporation from the soil are significantly lower than their hygienic standards in the working zone. The migration levels of the studied substances from soil to the lower atmospheric air layer depend on their initial concentrations and the type of soil: bicyclopyrone and pydiflumetofen migrate more intensively from sandy soil than from leached chernozem. Threshold concentrations in the soil according to the air – migration indicator of harmfulness: amicarbazone – 0.05 mg/kg, bicyclopyrone – 1.0 mg/kg and pydiflumetofen – 1.2 mg/kg are formed in the plow layer of soil when researched pesticides are introduced according to 1th, 20th and 20th maximum consumption rates. The “soil - atmospheric air” system is not a leading link to the migration of the studied pesticides in the environment. The obtained results were used in the substantiation of hygienic standard of amicarbazone, bicyclopyrone and pydiflumetofen in soil.
сontaminated food products constitute one of the primary routes for the entry of residual pesticide levels into the human body, necessitating the establishment of appropriate regulations and rules for their safe use. The new insecticide Oberon Rapid 240 SC, CS was studied using both field and laboratory research methods, applied to the crops such as sunflower and maize. An analysis of the physico-chemical properties of the active ingredients of the preparation – spiromesifen and abamectin – was conducted. The content of active ingredients in the growing plants was determined, and the permissible levels were justified in sunflower seeds and maize grains (spiromesifen – 0.002 mg/kg, abamectin – 0.01 mg/kg), in sunflower and maize oils (spiromesifen – 0.05 mg/kg, abamectin – 0.01 mg/kg). The obtained results allowed for the justification of harvest collection within 30 days, and based on the calculated integral hazard indicators, spiromesifen and abamectin were classified as Class 4/3 (slightly/moderately hazardous pesticides) for the consumption of food products, respectively.
The aim: scientific substantiation of the medical-sanitary regulations is the maximum permissible concentration in soil of modern persistent pesticides: amicarbazone from the class of triazolones, bicyclopyrone from the class of triketones and pydiflumetofen from the class of pyrazolecarboxamides. Materials and methods. Three stages of research were carried out: mathematical modeling of amicarbazone, bicyclopyrone and pydiflumetofen migration from soil to adjacent environments; laboratory hygienic experiment to examine studied substances behavior in systems «soil – plants», «soil - atmospheric air» and substantiation of their threshold concentrations in soil according to the translocation, air-migration and water-migration indicators of harmfulness; impact study of amicarbazone, bicyclopyrone and pydiflumetofen on the nitrifying activity of leached chernozem and setting their threshold concentrations according to the general sanitary indicator of harmfulness. Results. It was experimentally established that the threshold concentrations in soil according to the water-migration indicator of harmfulness are the concentrations of amicarbazone, bicyclopyrone and pydiflumetofen of 0.02 mg/kg, 0.01 mg/kg, and 0.06 mg/kg, respectively. The calculated threshold concentrations of amicarbazone (0.05 mg/kg), bicyclopyrone (0.02 mg/kg) and pydiflumetofen (0.05 mg/kg), which were obtained by mathematical modeling, turned out to be very close to experimentally determined ones, which proves a rather high prognostic ability of the applied calculation method. The threshold concentration in soil of amicarbazone, bicyclopyrone and pydiflumetofen according to the water-migration indicator of harmfulness turned out to be the lowest compared to the threshold concentrations according to the translocation (0.2 mg/kg, 0.25 mg/kg and 0.12 mg/kg, respectively), air-migration (0.05 mg/kg, 1.0 mg/kg and 1.2 mg/kg, respectively) and general sanitary (0.2 mg/kg, 0.05 mg/kg and in the range 0.12-0.6 mg/kg, respectively) indicators of harmfulness. Therefore, the leading link of studied substance migration in the environment is the «soil – groundwater» system. Conclusions. The MPC of amicarbazone, bicyclopyrone and pydiflumetofen in soil is scientifically justified at the level of 0.02 mg/kg, 0.01 mg/kg and 0.06 mg/kg, respectively, according to the limiting water-migration indicator of harmfulness. Based on the studied substances in the recommended consumption rates and frequency of treatments the usage of plant protection products in the cultivation of agricultural crops will not lead to dangerous to human health contamination of groundwater, agricultural raw materials and atmospheric air, it will not cause a violation of the processes of self-cleaning of soil from nitrogen-containing organic substances in real soil-climatic conditions in Ukraine.
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