Chemical Hydrolysis of Some Organic Phosphorus and Carbamate Pesticides in Aquatic Environments

Faust, SD

doi:10.1080/00139307209435465

Cited by 121 publications

(91 citation statements)

References 12 publications

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“…As reported by Ku et al (1998) the diazinon degradation occurred within 1 hour of ozone treatment [16]. These results agreed well with the previous studies on the reduction of carbamate pesticides and some organic phosphorus in water solution after ozone treatment with the same range of contact times [17].…”

Section: Study Of Optimum Frequency and Time For Iodine Liberation Ansupporting

confidence: 82%

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest

Whangchai¹,

Phiyanalinmat²,

Uthaibutra³

et al. 2013

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Ethion residue removal efficiency using individual and combined effects of ultrasonication (US), ozonation (O 3 ), ultrasonication and ozonation (US/O 3 ) was investigated. A 1 mg·L -1 standard ethion was subjected to an ultrasonic irradiation (3W input power) device with different frequencies of 108, 400, 700, 1000 kHz, and to an ozone with a concentration of 200 mg· mL -1 with various exposure times (0, 15, 30, 45 and 60 minutes). Reduction of residual ethion was determined by gas chromatography with flame photometric detection (GC-FPD). It was found that 1000 kHz ultrasonic irradiation for 60 minutes was the most effective treatment for reducing ethion concentration. Additionally, ozone could reduce the concentration of standard ethion after 60 minutes of exposure. Ultrasonic irradiation in combination with ozone had a synergistic effect in reducing standard ethion concentration, with the highest rate occurring within the first 15 minutes. Ethion concentration was reduced to 75.43% after ultrasonic irradiation at 1000 kHz and ozone exposure for 60 minutes. The effectiveness of the combined scheme for reducing of ethion residues on tangerine was also determined by GC-FPD. The ethion residue on fresh tangerines after ultrasonic irradiation and ozone washing was reduced by 73.03% after 60 minutes. The present study demonstrates that ultrasonic irradiation and ozone exposure could be used to reduce ethion residues in treated tangerine in order to meet the Standards for Pesticide Residue Limits.

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Section: Study Of Optimum Frequency and Time For Iodine Liberation Ansupporting

confidence: 82%

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest

Whangchai¹,

Phiyanalinmat²,

Uthaibutra³

et al. 2013

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“…For example, one group reports that at pH 9 and 20-25 C, the half-life for carbaryl was faster (t1/ 2 D 2.5-3.2 h) than that of carbofuran (t1/ 2 D 12.96 h). [67] In a separate study at pH 9 and an unspecified temperature, t 1/2 propoxur was reported as 38.4 h close to the half-life value of 38.5 h determined in our experiments. [60] Effects of NMC structure on rates of hydrolysis The relative rates of NMC hydrolysis may be rationalized by considering the chemical structure of the NMCs.…”

Section: Phosphatesmentioning

confidence: 97%

Tropical surface water quality studies: Implications for the aquatic fate ofN-methyl carbamate pesticides

Zamini

Monn

et al. 2017

Journal of Environmental Science and Health, Part B

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Water quality assessment was conducted on the Ruiru River, a tributary of an important tropical river system in Kenya, to determine baseline river conditions for studies on the aquatic fate of N-methyl carbamate (NMC) pesticides. Measurements were taken at the end of the long rainy season in early June 2013. Concentrations of copper (0.21-1.51 ppm), nitrates (2.28-4.89 ppm) and phosphates (0.01-0.50 ppm) were detected at higher values than in uncontaminated waters, and attributed to surface runoff from agricultural activity in the surrounding area. Concentrations of dissolved oxygen (8-10 ppm), ammonia (0.02-0.22 ppm) and phenols (0.19-0.83 ppm) were found to lie within normal ranges. The Ruiru River was found to be slightly basic (pH 7.08-7.70) with a temperature of 17.8-21.2 C. The half-life values for hydrolysis of three NMC pesticides (carbofuran, carbaryl and propoxur) used in the area were measured under laboratory conditions, revealing that rates of decay were influenced by the electronic nature of the NMCs. The hydrolysis half-lives at pH 9 and 18 C decreased in the order carbofuran (57.8 h) > propoxur (38.5 h) > carbaryl (19.3 h). In general, a decrease in the electron density of the NMC aromatic ring increases the acidity of the N-bound proton removed in the rate-limiting step of the hydrolysis mechanism. Our results are consistent with this prediction, and the most electron-poor NMC (carbaryl) hydrolyzed fastest, while the most electron-rich NMC (carbofuran) hydrolyzed slowest. Results from this study should provide baseline data for future studies on NMC pesticide chemical fate in the Ruiru River and similar tropical water systems.

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“…For instance, ethanol (25%) created a three-fold increase in the rate of parathion hydrolysis (FAUST andGOMAA 1972, HSIEH et al 1972) while detergents, emulsifiers, and increasing temperatures (M UHLMANN and SCHRADER 1957) will also increase reaction rates.…”

Section: A) Hydrolysismentioning

confidence: 97%

Chemical, physical, and biological methods for the disposal and detoxification of pesticides

Munnecke¹

1979

Residue Reviews

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Chemical Hydrolysis of Some Organic Phosphorus and Carbamate Pesticides in Aquatic Environments

Cited by 121 publications

References 12 publications

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest

Tropical surface water quality studies: Implications for the aquatic fate ofN-methyl carbamate pesticides

Chemical, physical, and biological methods for the disposal and detoxification of pesticides

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Chemical Hydrolysis of Some Organic Phosphorus and Carbamate Pesticides in Aquatic Environments

Cited by 121 publications

References 12 publications

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (&lt;i&gt;Citrus reticulata&lt;/i&gt; Blanco cv. Sai Nam Pung) fruit after harvest

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (&lt;i&gt;Citrus reticulata&lt;/i&gt; Blanco cv. Sai Nam Pung) fruit after harvest

Tropical surface water quality studies: Implications for the aquatic fate ofN-methyl carbamate pesticides

Chemical, physical, and biological methods for the disposal and detoxification of pesticides

Contact Info

Product

Resources

About

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest

The effects of ultrasonic irradiation in combination with ozone on the reduction of residual ethion of tangerine (<i>Citrus reticulata</i> Blanco cv. Sai Nam Pung) fruit after harvest