Toxicity screening after degradation of organophosphorus pesticides with chlorine dioxide

Effectiveness, mineralization and toxicity of four organophosphorus pesticides (OPPs) azamethiphos (AZA), dimethoate (DM), fenitrothion (FEN) and malathion (MAL) in water with chlorine dioxide (ClO2) as degradation agent were investigated. Analyses included toxicity tests of parent pesticides and their degradation products (DPs), using Daphnia magna test organisms, and total organic carbon (TOC) analysis. Toxicity tests showed that all four pesticide DPs were less toxic than parent pesticides, but DM had higher toxic DPs compared to parent AZA, FEN and MAL. All DPs were classified as category III (on a scale from I to V) of toxicity as acutely toxic. TOC analysis showed that AZA has lowest (only 18%) and MAL has highest mineralization (56%). Considering the obtained results, it could be concluded that ClO2 efficiently degrades AZA, DM, FEN and MAL and represents good solution for a safer environment

Supplementary data for the article: Kodranov, I. D.; Pergal, M. V.; Avdin, V. V.; Manojlović, D. D. Examination of Degradation and Ecotoxicology of Pethoxamid and Metazachlor after Chlorine Dioxide Treatment. Environ Monit Assess 2020, 192 (7), 422. https://doi.org/10.1007/s10661-020-08392-1

Supplementary material for: [https://doi.org/10.1007/s10661-020-08392-1]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/4007

Study on degradation of herbicides with chlorine dioxide

The aim of this study was to investigate and optimize degradation of herbicides (such as bentazone and thifensulfuron-methyl) with chlorine dioxide in deionized water. Degradation of herbicides was examined in deionized water with different amount of chlorine dioxide (5 and 10 ppm), different time of degradation (30 min, 1 h, 2 h, 3 h, 6 h and 24 h), at different pH (3, 7 and 9) and under light or dark conditions, while concentration of herbicides was 10 ppm. Degradation efficiency of herbicides was followed using HPLC-DAD. Major degradation products were identified using GC/MS analysis. The best degradation efficiency of bentazone was achieved by treatment with 10 ppm of chlorine dioxide under light, after 24 h of initial treatment, at pH of 3 and 7, and it was 92%. In the case of a thifensulfuron-methyl herbicide, the best efficiency of degradation was achieved by treatment with 10 ppm of chlorine dioxide under light, after 24 h of initial treatment, and it was 73%. Toxicological analysis using Daphnia magna was performed for degradation products 1, 6 and 24 h after the treatment with chlorine dioxide

Degradacija organofosfornog insekticida pomoću hlor-dioksida

In this paper, the degradation of organophosphorus insecticide (malathion) with chlorine dioxide was investigated. Degradation was studied in deionized water. Optimization of degradation conditions was examined under light condition, with different doses of chlorine dioxide, after different degradation times and at different pH values. This is the first study where degradation of malathion was done using chlorine dioxide as a degradation agent. The percentage of degradation was determined by HPLC-DAD, while the degradation products were isolated and identified by GC-MS. The results showed that pH has a significant influence on the degree of degradation. The value of degradation degree determined under the optimal conditions for malathion was 97.78 % using 5 mg/L chlorine dioxide at pH 7.00 after 24 h of treatment. By analyzing mass spectra of malathion, it was found that the resulting degradation products were diethyl 2-hydroxysuccinate, diethyl fumarate, dimethyl hydrogen phosphate and diethyl 2-((dimethoxyphosphoryl)thio)su-ccinate.U ovom radu je ispitivana degradacija organofosfornog insekticida (malationa) primenom hlor-dioksida. Degradacija je proučavana u dejonizovanoj vodi. Optimizacija uslova degradacije je ispitivana u uslovima svetlosti, sa različitim dozama hlor-dioksida, posle različitih vremenskih perioda degradacije i pri različitim pH vrednostima rastvora. Ovo je prvo istraživanje gde je degradacija malationa ispitivana upotrebom hlor-dioksida kao degradacionog sredstva. Procenat degradacije je određen pomoću HPLC-DAD, dok su degradacioni proizvodi izolovani i indentifikovani pomoću GC/MS. Rezultati su pokazali da pH ima značajan uticaj na stepen degradacije malationa. Ispitivani insekticid pokazuje dobar stepen degradacije. Vrednost stepena degradacije pri optimalnim uslovima za malation je 97,78 % primenom 5 mg/L hlor-dioksida na pH 7,00 posle 24 h tretmana. Analizom masenih spektara malationa utvrđeno je da su dobijeni degradacioni proizvodi: dietil 2-hi-droksisukcinat, dietil fumarat, dimetil hidrogen fosfat, dietil 2-((dimetoksifosforil)tio)sukcinat.Related to: [http://cer.ihtm.bg.ac.rs/handle/123456789/3286

Optimization of conditions for degradation of ibuprofen using chlorine dioxide

Ibuprofen (IBP) zbog svoje giroke primene, velike konzumacije, relativno brzog metabolizma i eliminacije iz organizma, predstavlja potencionalni rizik po 2ivotnu sredinu. Hlor - dioksid, kao jako oksidaciono sredstvo, pokazao se kao dobar reagens za uklanjanje odredenih grupa pesticida iz hrane i vode, kao i za degradaciju odredenih lekova. Cilj ovog rada bio je da se ispita pod kojim uslovima i u kojoj meri hlor - dioksid mote da ukloni IBP u vodi. Ispitivana je degradacija IBP razlibitih koncentracija (10, 20, 35 i 60 mg/L) sa razli6itim koncentracijama hlor - dioksida (5, 10 i 15 mg/L) na pH vrednostima 3,00, 7,00 i 10,00 i pri razliditim rekcionim vremenima (0,5 h, 1 h, 2 h, 3 h, 6 h, 24 h). Rezultati HPLC - DAD analize su pokazali da je IBP mogude efikasno ukloniti iz vode. Najveda efikasnost degradacije od 99% postignuta je kada je koncentracija IBP u vodi bila 10 mg/L, a rastvor je bio tretiran sa 15 mg/L hlor - dioksida na pH 10,00 posle 24 h tretiranja hlor - dioksidom.Due to ibuprofen (IBP) wide application, high consumption, relatively fast metabolism and elimination from the organism, it represents a potential risk for our environment. Chlorine dioxide, as a strong oxidizing agent, has been shown to be a good reagent for removing certain groups of pesticides from food and water, as well as for degradation of certain drugs. The aim of this study was to find optimal conditions for IBP removal from water using chlorine dioxide. Degradation of IBP of different concentrations (10, 20, 35 and 60 mg/L) with different concentrations of chlorine dioxide (5, 10 and 15 mg/L) at pH values of 3.00, 7.00 and 10.00 and at different reaction times (0.5 h, 1 h, 2 h, 3 h, 6 h, 24 h), was investigated. The results of HPLC - DAD analysis showed that IBP can be effectively removed from water. The highest degradation efficiency of 99% was achieved when the concentration of IBP in water was 10 mg/L, and the solution was treated with 15 mg/L of chlorine dioxide at pH 10.00 after 24 h of chlorine dioxide treatment

The effect of chlorine dioxide on organophosphorous pesticide degradation

This study investigates degradation of organophosphorus pesticide, such as fenitrothion, with chlorine dioxide in deionized water and in real water system (water from River Sava)

Thermal characterization of polyurethane/silver ferrite nanocomposites

The novel polyurethane composite films were prepared using in situ polymerization method in thepresence of silver ferrite nanoparticles (1 wt.%). Preparation, structure, and thermal characterizationof polyurethane/silver ferrite nanocomposites (PUFNCs) were investigated. The study of the effectof soft segment content (from 30 to 60 wt.%) on the structure and thermal properties was performedusing FTIR, DSC, TGA and TEM analyses. The higher thermal stability was detected for PUFNCswith higher soft segment content. The glass transition of the hard segment (TgHS) of PUFNCsincreased with decreasing soft segment content due to higher crosslinking density

Chemical characterization, antioxidant and antimicrobial properties of goji berries cultivated in serbia

Since the fruits of Lycium L. species (Fructus lycii, goji berries) are promoted as a “superfood” with plenty of health benefits, there is extensive research interest in their nutritional and phytochemical composition. In the present study, the nutritional value, minerals, fatty acid composition, and bioactive compounds of L. barbarum L., red, yellow, and black goji berry (L. ruthenicum Murray.) cultivated in Serbia were investigated. Antioxidant and antimicrobial properties of their methanol extracts were assessed. Red goji berry had the highest content of fats, dietary fiber, iron, total carotenoids, and 2-O- -d-glucopyranosyl-l-ascorbic acid (AA-2 G). The yellow goji berry extract showed the highest level of flavonoids and the most prominent antimicrobial (especially against Gram-negative bacteria) properties. The highest total phenolic content and the most potent antioxidant activity were observed for the extract of black goji berry. Therefore, all goji berries could be a valuable source of bioactive compounds in the food and pharmaceutical industry

Thermal characterization of polyurethane/silver ferrite nanocomposites

The novel polyurethane composite films were prepared using in situ polymerization method in the presence of silver ferrite nanoparticles (1 wt.%). Preparation, structure, and thermal characterization of polyurethane/silver ferrite nanocomposites (PUFNCs) were investigated. The study of the effect of soft segment content (from 30 to 60 wt.%) on the structure and thermal properties was performed using FTIR, DSC, TGA and TEM analyses. The higher thermal stability was detected for PUFNCs with higher soft segment content. The glass transition of the hard segment (TgHS) of PUFNCs increased with decreasing soft segment content due to higher crosslinking density

Degradation of organophosphorus insecticide by chlorine dioxide

U ovom radu je ispitivana degradacija organofosfornog insekticida (malationa) primenom hlor-dioksida. Degradacija je prouEavana u dejonizovanoj vodi. Optimizacija uslova degradacije je ispitivana u uslovima svetlosti, sa razhEitim dozama hlor-dioksida, posle razhatih vremenskih perioda degradacije i pri razliatim pH vrednostima rastvora. Ovo je prvo istraiivanje gde je degradacija malationa ispitivana upotrebom hlor-dioksida kao degradacionog sredstva. Procenat degradacije je odreden porno& HPLC-DAD, dok su degradacioni proizvodi izolovani i indentifikovani porno& GC/MS. Rezultati su pokazali da pH ima zna6ajan uticaj na stepen degradacije malationa. Ispitivani insekticid pokazuje dobar stepen degradacije. Vrednost stepena degradacije pri optimalnim uslovima za malation je 97,78 % primenom 5 mg/L hlor-dioksida na pH 7,00 posle 24 h tretmana. Analizom masenih spektara malationa utvrdeno je da su dobijeni degradacioni proizvodi: dietil 2-hidroksisukcinat, dietil fumarat, dimetil hidrogen fosfat, dietil 2-((dime-toksifosforil)tio)sukcinat.In this paper, the degradation of organophosphorus insecticide (malathion) with chlorine dioxide was investigated. Degradation was studied in deionized water. Optimization of degradation conditions was examined under light condition, with different doses of chlorine dioxide, after different degradation times and at different pH values. This is the first study where degradation of malathion was done using chlorine dioxide as a degradation agent. The percentage of degradation was determined by HPLC-DAD, while the degradation products were isolated and identified by GC-MS. The results showed that pH has a significant influence on the degree of degradation. The value of degradation degree determined under the optimal conditions for malathion was 97.78 % using 5 mg/L chlorine dioxide at pH 7.00 after 24 h of treatment. By analyzing mass spectra of malathion, it was found that the resulting degradation products were diethyl 2-hydroxysuccinate, diethyl fumarate, dimethyl hydrogen phosphate and diethyl 2-(dimethoxyphosphoryl)thio)succinate