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Thomas B Moorman - One of the best experts on this subject based on the ideXlab platform.
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
Environmental Science & Technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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Sorption and Photodegradation Processes Govern Distribution and Fate of Sulfamethazine in Freshwater−Sediment Microcosms
Environmental science & technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
ARS USDA Submissions, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for <7% of radioactivity in the water or sediment. Less than 3% of applied radioactivity was mineralized to 14CO2. Manure input significantly increased sorption and binding of Sulfamethazine residues to the sediment. These results show concurrent processes of photodegradation and sorption to sediment control aqueous concentrations and establish that sediment is a sink for Sulfamethazine and Sulfamethazine-related residues. Accumulation of the photoproducts and Sulfamethazine in sediment may have important implications for benthic organisms.
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Sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater−sediment microcosms
2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for
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effect of organic carbon and ph on soil sorption of Sulfamethazine
Chemosphere, 2009Co-Authors: Warisara Lertpaitoonpan, Thomas B MoormanAbstract:Abstract Batch sorption of Sulfamethazine was conducted using five soils with organic carbon (OC) contents ranging from 0.1% to 3.8% and solution pHs ranging from 5.5 to 9. Sorption of Sulfamethazine was found to be impacted by OC, soil surface area and soil solution pH, with higher K d values for soils with higher OC and lower K d values as the pH increased. However, OC was found to be the more dominant parameter. Linear partition coefficients at pH 5.5 were found to be 0.58 ± 0.17 L kg −1 for soil with 0.1% OC and 3.91 ± 0.36 L kg −1 for soil with 3.8% OC. At pH 9, the K d values were found to decrease by more than 50% to 0.23 ± 0.06 L kg −1 (soil with 0.1% OC) and 1.16 ± 0.05 L kg −1 (soil with 3.8% OC). Hydrophobic sorption was probably involved for pH K a,2 = 7.4 for Sulfamethazine) due to the non-ionized form of Sulfamethazine while surface sorption was probably involved for pH > 7.4 due to the ionized form of Sulfamethazine. This was confirmed by regressing the estimated sorption coefficients of cationic, uncharged, and anionic species against the soil properties. A stepwise linear regression model incorporating the anionic fraction of Sulfamethazine ionization and soil properties were developed and were found to estimate the K d values of other studies using soils of different pH and soil properties.
Joel R Coats - One of the best experts on this subject based on the ideXlab platform.
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
Environmental Science & Technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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Sorption and Photodegradation Processes Govern Distribution and Fate of Sulfamethazine in Freshwater−Sediment Microcosms
Environmental science & technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
ARS USDA Submissions, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for <7% of radioactivity in the water or sediment. Less than 3% of applied radioactivity was mineralized to 14CO2. Manure input significantly increased sorption and binding of Sulfamethazine residues to the sediment. These results show concurrent processes of photodegradation and sorption to sediment control aqueous concentrations and establish that sediment is a sink for Sulfamethazine and Sulfamethazine-related residues. Accumulation of the photoproducts and Sulfamethazine in sediment may have important implications for benthic organisms.
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Sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater−sediment microcosms
2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for
Lanfeng Zhao - One of the best experts on this subject based on the ideXlab platform.
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effects of six selected antibiotics on plant growth and soil microbial and enzymatic activities
Environmental Pollution, 2009Co-Authors: Feng Liu, Guangguo Ying, Ran Tao, Jianliang Zhao, Jifeng Yang, Lanfeng ZhaoAbstract:The potential impact of six antibiotics (chlortetracycline, tetracycline and tylosin; sulfamethoxazole, Sulfamethazine and trimethoprim) on plant growth and soil quality was studied by using seed germination test on filter paper and plant growth test in soil, soil respiration and phosphatase activity tests. The phytotoxic effects varied between the antibiotics and between plant species (sweet oat, rice and cucumber). Rice was most sensitive to sulfamethoxazole with the EC10 value of 0.1 mg/L. The antibiotics tested inhibited soil phosphatase activity during the 22 days' incubation. Significant effects on soil respiration were found for the two sulfonamides (sulfamethoxazole and Sulfamethazine) and trimethoprim, whereas little effects were observed for the two tetracyclines and tylosin. The effective concentrations (EC10 values) for soil respiration in the first 2 days were 7 mg/kg for sulfamethoxazole, 13 mg/kg for Sulfamethazine and 20 mg/kg for trimethoprim. Antibiotic residues in manure and soils may affect soil microbial and enzyme activities.
Glen W. Almond - One of the best experts on this subject based on the ideXlab platform.
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Sulfamethazine Water Medication Pharmacokinetics and Contamination in a Commercial Pig Production Unit
Journal of food protection, 2008Co-Authors: Sharon E. Mason, Ronald E. Baynes, Jennifer L. Buur, Jim E. Riviere, Glen W. AlmondAbstract:Sulfamethazine is often used to treat disease in the swine industry. Sulfamethazine is available as water or feed medication and historically (over the past 40 years) has been associated with residue violations in both the United States and Europe. Despite Sulfamethazine's approval for use as a water medication, little research on the pharmacokinetics of the water formulation is available. Therefore, a pilot study was performed to determine the plasma levels of an approved Sulfamethazine water medication. Plasma levels in pigs treated with an oral bolus (250 mg/kg), which is equivalent to the total drug consumed within a 24-h period, achieved therapeutic concentrations (50 microg/ml). Noncompartmental-based pharmacokinetic model parameters for clearance, half-life, and volume of distribution were consistent with previously published values in swine. However, the above treatment resulted in exposure of pen mates to Sulfamethazine at levels currently above tolerance (0.1 ppm). Using a physiologically based pharmacokinetic model, the treatment dose simulation was compared with observed plasma levels of treated pigs. Flexibility of the physiologically based pharmacokinetic model also allowed simulation of control-pig plasma levels to estimate contamination exposure. A simulated exposure to 0.15 mg/kg twice within approximately 8 h resulted in detectable levels of Sulfamethazine in the control pigs. After initial exposure, a much lower dose of 0.059 mg/kg maintained the contamination levels above tolerance for at least 3 days. These results are of concern for producers and veterinarians, because in commercial farms, the entire barn is often treated,and environmental contamination could result in residues of an unknown duration.
Keri L Carstens - One of the best experts on this subject based on the ideXlab platform.
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
Environmental Science & Technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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Sorption and Photodegradation Processes Govern Distribution and Fate of Sulfamethazine in Freshwater−Sediment Microcosms
Environmental science & technology, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L–1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9–6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40–60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts a...
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sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater sediment microcosms
ARS USDA Submissions, 2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for <7% of radioactivity in the water or sediment. Less than 3% of applied radioactivity was mineralized to 14CO2. Manure input significantly increased sorption and binding of Sulfamethazine residues to the sediment. These results show concurrent processes of photodegradation and sorption to sediment control aqueous concentrations and establish that sediment is a sink for Sulfamethazine and Sulfamethazine-related residues. Accumulation of the photoproducts and Sulfamethazine in sediment may have important implications for benthic organisms.
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Sorption and photodegradation processes govern distribution and fate of Sulfamethazine in freshwater−sediment microcosms
2013Co-Authors: Keri L Carstens, Aaron D Gross, Thomas B Moorman, Joel R CoatsAbstract:The antibiotic Sulfamethazine can be transported from manured fields to surface water bodies. We investigated the degradation and fate of Sulfamethazine in pond water using 14C-phenyl-Sulfamethazine in small pond water microcosms containing intact sediment and pond water. We found a 2.7-day half-life in pond water and 4.2-day half-life when Sulfamethazine was added to the water (5 mg L−1 initial concentration) with swine manure diluted to simulate runoff. Sulfamethazine dissipated exponentially from the water column, with the majority of loss occurring via movement into the sediment phase. Extractable Sulfamethazine in sediment accounted for 1.9−6.1% of the applied antibiotic within 14 days and then declined thereafter. Sulfamethazine was transformed mainly into nonextractable sediment-bound residue (40−60% of applied radioactivity) and smaller amounts of photoproducts. Biodegradation, as indicated by metabolite formation and 14CO2 evolution, was less significant than photodegradation. Two photoproducts accounted for 15−30% of radioactivity in the water column at the end of the 63-day study; the photoproducts were the major degradates in the aqueous and sediment phases. Other unidentified metabolites individually accounted for
