Photochemical effects of humic substances on the degradation of organophosphorus pesticides

Kamiya, Mamoru; Kameyama, Katsura

doi:10.1016/s0045-6535(97)10202-8

Cited by 69 publications

(42 citation statements)

References 15 publications

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“…If equilibrium of insecticides between water and sediment was attained, the mean concentrations of S 5 OPs and S 8 SPs in water were 51 AE 61 and 6.0 AE 21 ng/L, respectively (the calculation was detailed in the SI). As shown in Table S1, both OPs and SPs were quickly degraded in water and their half-lives for photodegradation in water ranged from 1 to 98 d. Kamiya and Kameyama (1998) reported that dissolved humic substances would enhance degradation of OPs in water. Chaohu Lake experienced serious eutrophication and had high occurrence of nitrogen, phosphate, bacterioplankton (Wei et al, 2008), blue-green algae (Liu, 2007), and dissolved OC (Zhang et al, 2004), thus the degradation rates of OPs may be (Table S1).…”

Section: Comparison To Other Studiesmentioning

confidence: 99%

Distribution and toxicity of current-use insecticides in sediment of a lake receiving waters from areas in transition to urbanization

Wang

You

2012

Environmental Pollution

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Section: Comparison To Other Studiesmentioning

confidence: 99%

Distribution and toxicity of current-use insecticides in sediment of a lake receiving waters from areas in transition to urbanization

Wang

You

2012

Environmental Pollution

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“…In the United States the industrial releases of PNP reported to the Environmental Protection Agency totaled 772 lb in 2004 (http://www.epa.gov/tri/tridata /index.htm). In addition to industrial releases, PNP enters the environment through microbial and photochemical degradation of parathion-based insecticides (22,29,39).…”

mentioning

confidence: 99%

Cloning of a Gene Cluster Involved in the Catabolism of p -Nitrophenol by Arthrobacter sp. Strain JS443 and Characterization of the p -Nitrophenol Monooxygenase

Perry

Zylstra

2007

J Bacteriol

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The npd gene cluster, which encodes the enzymes of a p-nitrophenol catabolic pathway from Arthrobacter sp. strain JS443, was cloned and sequenced. Three genes, npdB, npdA1, and npdA2, were independently expressed in Escherichia coli in order to confirm the identities of their gene products. NpdA2 is a p-nitrophenol monooxygenase belonging to the two-component flavin-diffusible monooxygenase family of reduced flavindependent monooxygenases. NpdA1 is an NADH-dependent flavin reductase, and NpdB is a hydroxyquinol 1,2-dioxygenase. The npd gene cluster also includes a putative maleylacetate reductase gene, npdC. In an in vitro assay containing NpdA2, an E. coli lysate transforms p-nitrophenol stoichiometrically to hydroquinone and hydroxyquinol. It was concluded that the p-nitrophenol catabolic pathway in JS443 most likely begins with a two-step transformation of p-nitrophenol to hydroxy-1,4-benzoquinone, catalyzed by NpdA2. Hydroxy-1,4-benzoquinone is reduced to hydroxyquinol, which is degraded through the hydroxyquinol ortho cleavage pathway. The hydroquinone detected in vitro is a dead-end product most likely resulting from chemical or enzymatic reduction of the hypothetical intermediate 1,4-benzoquinone. NpdA2 hydroxylates a broad range of chloro-and nitro-substituted phenols, resorcinols, and catechols. Only p-nitro-or p-chloro-substituted phenols are hydroxylated twice. Other substrates are hydroxylated once, always at a position para to a hydroxyl group.

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“…5 was also found for the other examined phenols. The peculiar properties of humic components, known to act as sensitizers of photodegradation (Kamiya and Kameyama 1998), can also justify the non negligible substrates degradation observed in the absence of TiO 2 . In fact, ca.…”

Section: Photocatalytic Treatment Of Soil Washing Extractsmentioning

confidence: 99%

Removal of alkylphenols from polluted sites using surfactant-assisted soil washing and photocatalysis

Davezza

Fabbri

Prevot

et al. 2010

Environ Sci Pollut Res

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Background and Purpose Surfactant-assisted soil washing and photocatalysis are well known remediation processes of environmental concern. The application of photocatalysis to treat soil washing extracts containing 4-methylphenol, 4-ethylphenol and 4-tert-butylphenol in the presence of nonionic (C 12 E 8 and C 12 E 23 ) and anionic (SDS) surfactants and some of their binary mixtures was investigated in this work by studying the pollutants degradation in the presence of TiO 2 dispersions irradiated with simulated solar light. Materials and methods Clean soil samples were spiked with the investigated alkylphenols. Aqueous solutions of the chosen surfactants were placed in contact for some hours with the spiked soil samples in a rotatory mixer. The pollutants recoveries were evaluated via HPLC analysis. Photocatalytic experiments were performed in solarbox on aqueous solutions and on aqueous surfactant solutions containing the pollutants. Results The pollutants removal from the soil was proven effective using the examined surfactant solutions. The photocatalytic treatment of the wastes was faster using Brij 35, but also SDS and C 12 E 8 -SDS mixtures can be applied. After 2-5 hours the complete pollutants abatement was obtained, depending on the surfactant chosen and on the amount of TiO 2 employed. On the contrary, the treatment of wastes containing C 12 E 8 was an extremely slow process. Conclusions The photocatalytic approach can be applied to remove the examined aromatic pollutants from the washing wastes, confirming the viable coupling between this advanced oxidation method and the surfactant-based soil remediation treatments. Surfactant adsorption onto TiO 2 and micelles concentration play a dominant role.

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Photochemical effects of humic substances on the degradation of organophosphorus pesticides

Cited by 69 publications

References 15 publications

Distribution and toxicity of current-use insecticides in sediment of a lake receiving waters from areas in transition to urbanization

Distribution and toxicity of current-use insecticides in sediment of a lake receiving waters from areas in transition to urbanization

Cloning of a Gene Cluster Involved in the Catabolism of p -Nitrophenol by Arthrobacter sp. Strain JS443 and Characterization of the p -Nitrophenol Monooxygenase

Removal of alkylphenols from polluted sites using surfactant-assisted soil washing and photocatalysis

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