Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia
The degradation of organophosphate pesticides in aquatic ecosystems is influenced by various environmental factors. This study investigates the influence of nitrate, sulfate, and phosphate on the degradation of malathion, a commonly used organophosphate pesticide, in the North Oconee River watershed...
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KeAi Communications Co., Ltd.
2025-09-01
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| Series: | Emerging Contaminants |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405665025000769 |
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| author | Grace Stamm Gayatri Basapuram Srimanti Duttagupta Avishek Dutta |
| author_facet | Grace Stamm Gayatri Basapuram Srimanti Duttagupta Avishek Dutta |
| author_sort | Grace Stamm |
| collection | DOAJ |
| description | The degradation of organophosphate pesticides in aquatic ecosystems is influenced by various environmental factors. This study investigates the influence of nitrate, sulfate, and phosphate on the degradation of malathion, a commonly used organophosphate pesticide, in the North Oconee River watershed in Georgia. Microcosm experiments were conducted to simulate environmental conditions and assess both microbial and non-microbial transformation pathways. Nitrate, sulfate, and phosphate were found to enhance malathion degradation through microbially mediated oxidative and hydrolytic pathways. The presence of mercuric chloride, which suppressed microbial activity, resulted in slower degradation rates across all conditions, underscoring the pivotal role of microbial communities in pesticide transformation. Non-targeted analyses identified key degradation products, including malaoxon, succinic acid, and diethyl succinate, primarily under nitrate and sulfate conditions, supporting the involvement of these anions in the degradation process. These findings highlight the complex interactions between nutrient dynamics and pesticide persistence, offering valuable insights for sustainable water management and pollution control in agro-impacted freshwater systems. |
| format | Article |
| id | doaj-art-ead0099c8ba84fa1afa122f20e05acd7 |
| institution | Kabale University |
| issn | 2405-6650 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Emerging Contaminants |
| spelling | doaj-art-ead0099c8ba84fa1afa122f20e05acd72025-08-20T03:49:56ZengKeAi Communications Co., Ltd.Emerging Contaminants2405-66502025-09-0111310054210.1016/j.emcon.2025.100542Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in GeorgiaGrace Stamm0Gayatri Basapuram1Srimanti Duttagupta2Avishek Dutta3Department of Geology, University of Georgia, Athens, GA, 30602, USA; Department of Physics and Astronomy, University of Georgia, Athens, GA, 30602, USADepartment of Geology, University of Georgia, Athens, GA, 30602, USADepartment of Geology, University of Georgia, Athens, GA, 30602, USA; Corresponding author.Department of Geology, University of Georgia, Athens, GA, 30602, USA; Savannah River Ecological Laboratory, University of Georgia, Aiken, SC, 29802, USA; Corresponding author. Department of Geology, University of Georgia, Athens, GA, 30602, USA.The degradation of organophosphate pesticides in aquatic ecosystems is influenced by various environmental factors. This study investigates the influence of nitrate, sulfate, and phosphate on the degradation of malathion, a commonly used organophosphate pesticide, in the North Oconee River watershed in Georgia. Microcosm experiments were conducted to simulate environmental conditions and assess both microbial and non-microbial transformation pathways. Nitrate, sulfate, and phosphate were found to enhance malathion degradation through microbially mediated oxidative and hydrolytic pathways. The presence of mercuric chloride, which suppressed microbial activity, resulted in slower degradation rates across all conditions, underscoring the pivotal role of microbial communities in pesticide transformation. Non-targeted analyses identified key degradation products, including malaoxon, succinic acid, and diethyl succinate, primarily under nitrate and sulfate conditions, supporting the involvement of these anions in the degradation process. These findings highlight the complex interactions between nutrient dynamics and pesticide persistence, offering valuable insights for sustainable water management and pollution control in agro-impacted freshwater systems.http://www.sciencedirect.com/science/article/pii/S2405665025000769MalathionWater qualityDegradationAnion-mediated transformationMicrobial inhibition |
| spellingShingle | Grace Stamm Gayatri Basapuram Srimanti Duttagupta Avishek Dutta Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia Emerging Contaminants Malathion Water quality Degradation Anion-mediated transformation Microbial inhibition |
| title | Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia |
| title_full | Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia |
| title_fullStr | Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia |
| title_full_unstemmed | Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia |
| title_short | Anion-mediated pathways in organophosphate degradation in the Oconee River watershed in Georgia |
| title_sort | anion mediated pathways in organophosphate degradation in the oconee river watershed in georgia |
| topic | Malathion Water quality Degradation Anion-mediated transformation Microbial inhibition |
| url | http://www.sciencedirect.com/science/article/pii/S2405665025000769 |
| work_keys_str_mv | AT gracestamm anionmediatedpathwaysinorganophosphatedegradationintheoconeeriverwatershedingeorgia AT gayatribasapuram anionmediatedpathwaysinorganophosphatedegradationintheoconeeriverwatershedingeorgia AT srimantiduttagupta anionmediatedpathwaysinorganophosphatedegradationintheoconeeriverwatershedingeorgia AT avishekdutta anionmediatedpathwaysinorganophosphatedegradationintheoconeeriverwatershedingeorgia |