Degradation Products of Sulfur-Containing Pesticides in Soil and Water

Cj, Miles

doi:10.1021/bk-1991-0459.ch005

Cited by 6 publications

(1 citation statement)

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“…7 Mass spectrum of the metabolite of 3-MBT having a GC retention time of 23.22 minutes sulfoxide agrees with previous findings (FEDORAK and GRBIĆ-GALIĆ 1991) and is of great importance, environmentally, as sulfoxidation is one of the most important degradation pathways. The sulfoxide product has a much higher water solubility and lower sorption to soil than the parent compound and therefore has higher groundwater contamination potential (MILES 1991). It also has a slower degradation rate than the parent compound and studies have reported it persists for a longer period than the parent compound (LACORTE et al 1996, MINELLI et al 1996.…”

Section: -Methylbenzothiophenementioning

confidence: 99%

Aerobic co-metabolism of sulfur, nitrogen and oxygen heterocycles by three marine bacterial consortia

Meade¹,

Hellou²,

Patel³

2002

J. Basic Microbiol.

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Bacterial samples were collected from three marine beaches in coastal Newfoundland, Canada, and enriched by growth on 1‐methylnaphthalene. The most prominent bacterial cell type for each consortium was isolated in a serial dilutions test, and a substrate utilization profile was obtained for each using the Biolog MicroStation System. Each bacterial community was tested for its ability to co‐metabolize sulfur heterocycles (benzothiophene: BT, 3‐methylbenzothiophene: 3‐MBT, and dibenzothiophene: DBT), a nitrogen heterocycle (carbazole: CARB), and an oxygen heterocycle (dibenzofuran: DBF). Co‐metabolism of the starting material was determined using gas chromatography‐mass spectroscopy (GC‐MS), and formation of products was investigated by GC‐MS and Fourier transform infrared (FTIR) spectroscopy. Bacterial growth was monitored turbidimetrically to determine the dry weight (μg) of cells/ml. The 2‐ringed heterocycles were co‐metabolized faster and to a greater extent than the 3‐ringed compounds. Co‐metabolism of BT was not statistically different from that for 3‐MBT and, likewise, a comparison of the 3‐ringed heterocycles showed no significant differences in degradation rates. Statistical examination showed that no one culture demonstrated a significantly greater ability to co‐metabolize the heterocycles studied. This study represents the first comprehensive investigation of the ability of local bacteria to co‐metabolize a range of aromatic compounds and provides a preliminary understanding of their fate in sediments should contamination by these compounds occur.

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Section: -Methylbenzothiophenementioning

confidence: 99%

Aerobic co-metabolism of sulfur, nitrogen and oxygen heterocycles by three marine bacterial consortia

Meade¹,

Hellou²,

Patel³

2002

J. Basic Microbiol.

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On the Low‐Lying Excited States of sym‐Triazine‐Based Herbicides

et al. 2005

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We report a joint computational and luminescence study on the low-lying excited states of sym-triazines, namely, 1,3,5-triazine (1) and the ubiquitous herbicides atrazine [6-chloro-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (2)] and ametryn [6-methylthio-N2-ethyl-N4-isopropyl-1,3,5-triazine-2,4-diamine (3)]. Geometrical structures, energetics, and transition and state properties of I and 2 were computed at the TD-DFT, CASSCF, and CASPT2 levels of theory. The fluorescence and phosphorescence emission spectra, lifetimes, and fluorescence quantum yields were measured for the three compounds, and from these, the energies of the lowest excited states and their corresponding radiative rates were determined. The predictions from CASPT2 calculations are in good agreement with the experimental results obtained from the luminescence studies and allow the interpretation of different absorption and emission features.

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Biotransformation of pesticides in saturated-zone materials

Hoyle¹,

Arthur

2000

Hydrogeology Journal

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Degradation Products of Sulfur-Containing Pesticides in Soil and Water

Cited by 6 publications

References 0 publications

Aerobic co-metabolism of sulfur, nitrogen and oxygen heterocycles by three marine bacterial consortia

Aerobic co-metabolism of sulfur, nitrogen and oxygen heterocycles by three marine bacterial consortia

On the Low‐Lying Excited States of sym‐Triazine‐Based Herbicides

Biotransformation of pesticides in saturated-zone materials

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