Degradation and adsorption of 14C-mecoprop (MCPP) in surface soils and in subsoil. Influence of temperature, moisture content, sterilization and concentration on degradation

Helweg, A.

doi:10.1016/0048-9697(93)90134-r

Cited by 38 publications

(21 citation statements)

References 12 publications

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“…Previous investigations reported the influence of single parameters such as bioavailability (20), adaptation (4,10,13), PA concentration (17,30), moisture level (18), or temperature (17) on degradation rates, but this study is the first to compare the degradation of all the three compounds, 2,4-D, MCPA, and MCPP, in different soils incubated under the same controlled laboratory conditions. Crespin et al (7) found almost the same degradation rates of 2,4-D and MCPA under field conditions, whereas other studies of the three PA individually showed mineralization within 5 to 50 days (1,4,17,18,28). This is in accordance with our results for soil previously exposed to PA and in contrast to our PA-pristine soils.…”

Section: Discussionsupporting

confidence: 65%

“…This is in accordance with our results for soil previously exposed to PA and in contrast to our PA-pristine soils. Growth of degraders utilizing the carbon in PA generates the general sigmoid mineralization pattern observed here and reported in almost all other studies of PA mineralization as well (18,25). However, the zero-order mineralization kinetics and very low mineralization potentials observed here for a number of the soils not previously exposed to PA have only rarely been reported for PA mineralization in top soils under realistic conditions (15).…”

Section: Discussionmentioning

confidence: 52%

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Modeling of Phenoxy Acid Herbicide Mineralization and Growth of Microbial Degraders in 15 Soils Monitored by Quantitative Real-Time PCR of the Functional tfdA Gene

Bælum

Prestat

David

et al. 2012

Appl Environ Microbiol

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f Mineralization potentials, rates, and kinetics of the three phenoxy acid (PA) herbicides, 2,4-dichlorophenoxyacetic acid (2,4-D), 4-chloro-2-methylphenoxyacetic acid (MCPA), and 2-(4-chloro-2-methylphenoxy)propanoic acid (MCPP), were investigated and compared in 15 soils collected from five continents. The mineralization patterns were fitted by zero/linear or exponential growth forms of the three-half-order models and by logarithmic (log), first-order, or zero-order kinetic models. Prior and subsequent to the mineralization event, tfdA genes were quantified using real-time PCR to estimate the genetic potential for degrading PA in the soils. In 25 of the 45 mineralization scenarios, ϳ60% mineralization was observed within 118 days. Elevated concentrations of tfdA in the range 1 ؋ 10 5 to 5 ؋ 10 7 gene copies g ؊1 of soil were observed in soils where mineralization could be described by using growth-linked kinetic models. A clear trend was observed that the mineralization rates of the three PAs occurred in the order 2,4-D > MCPA > MCPP, and a correlation was observed between rapid mineralization and soils exposed to PA previously. Finally, for 2,4-D mineralization, all seven mineralization patterns which were best fitted by the exponential model yielded a higher tfdA gene potential after mineralization had occurred than the three mineralization patterns best fitted by the Lin model.

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Section: Discussionsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 52%

Modeling of Phenoxy Acid Herbicide Mineralization and Growth of Microbial Degraders in 15 Soils Monitored by Quantitative Real-Time PCR of the Functional tfdA Gene

Bælum

Prestat

David

et al. 2012

Appl Environ Microbiol

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“…While mineralization of mecoprop has previously been observed in unsaturated sediments (Reffstrup et al, 1998; Helweg, 1993), the present study is the first report of mecoprop mineralization in ground water in a wetland area. The findings indicate that mineralization also occurred under anaerobic conditions, something not previously reported for a phenoxyalcanoic acid herbicide.…”

Section: Discussionsupporting

confidence: 47%

Potential Mineralization of Four Herbicides in a Ground Water–Fed Wetland Area

2001

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Herbicides may leach from agricultural fields into ground water feeding adjacent wetlands. However, only little is known of the fate of herbicides in wetland areas. The purpose of the study was to examine the potential of a riparian fen to mineralize herbides that could leach from an adjacent catchment area. Slurries were prepared from sediment and ground water collected from different parts of a wetland representing different redox conditions. The slurries were amended with O2, NO3-, SO4(2-), and CO2, or CO2 alone as electron acceptors to simulate the in situ conditions and their ability to mineralize the herbides mecoprop, metsulfuron-methyl, isoproturon and atrazine. In addition, the abundance of bacteria able to utilize O2, NO3-, SO4(2-) + CO2, and CO2 as electron acceptors was investigated along with the O2-reducing and methanogenic potential of the sediment. The recalcitrance to bacterial degradation depended on both the type of herbicide and the redox conditions pertaining. Mecoprop was the most readily degraded herbicide, with 36% of [ring-U-14C]mecoprop being mineralized to 14CO2 under aerobic conditions after 473 d. In comparison, approximately 29% of [phenyl-U-14C]metsulfuron-methyl and 16% of [ring-U-14C]isoproturon mineralized in aerobic slurries during the same period. Surprisingly, 8 to 13% of mecoprop also mineralized under anaerobic conditions. Neither metsulfuron-methyl nor isoproturon were mineralized under anaerobic conditions and atrazine was not mineralized under any of the redox conditions examined. The present study is the first to report mineralization of meco-prop in ground water in a wetland area, and the first to report mineralization of a phenoxyalcanoic acid herbicide under both aerobic and anaerobic conditions.

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“…The growth rate of bacterial communities and their condition in soil are positively correlated with organic matter and nutrient content and depend on such specific factors as temperature, moisture, and pH (in acid soils, the population of bacteria is lower because of the adverse effects of exchangeable Al) . Therefore, the degradation rate of phenoxyalkanoic acid herbicides was positively correlated with temperature in a range of 5 °C to 30 °C but decreased at 40 °C . The degradation rate was the highest at 50% of maximum water holding capacity but lower when the soil moisture was much lower or much higher .…”

Section: Degradationmentioning

confidence: 99%

Adsorption and degradation of phenoxyalkanoic acid herbicides in soils: A review

Paszko

Muszyński

Materska

et al. 2016

Enviro Toxic and Chemistry

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The primary aim of the present review on phenoxyalkanoic acid herbicides-2-(2,4-dichlorophenoxy) acetic acid (2,4-D), 2-(4-chloro-2-methylphenoxy) acetic acid (MCPA), (2R)-2-(2,4-dichlorophenoxy) propanoic acid (dichlorprop-P), (2R)-2-(4-chloro-2-methylphenoxy) propanoic acid (mecoprop-P), 4-(2,4-dichlorophenoxy) butanoic acid (2,4-DB), and 4-(4-chloro-2-methylphenoxy) butanoic acid (MCPB)-was to compare the extent of their adsorption in soils and degradation rates to assess their potential for groundwater contamination. The authors found that adsorption decreased in the sequence of 2,4-DB > 2,4-D > MCPA > dichlorprop-P > mecoprop-P. Herbicides are predominantly adsorbed as anions-on organic matter and through a water-bridging mechanism with adsorbed Fe cations-and their neutral forms are adsorbed mainly on organic matter. Adsorption of anions of 2,4-D, MCPA, dichlorprop-P, and mecoprop-P is inversely correlated with their lipophilicity values, and modeling of adsorption of the compounds based on this relationship is possible. The predominant dissipation mechanism of herbicides in soils is bacterial degradation. The contribution of other mechanisms, such as degradation by fungi, photodegradation, or volatilization from soils, is much smaller. The rate of bacterial degradation decreased in the following order: 2,4-D > MCPA > mecoprop-P > dichlorprop-P. It was found that 2,4-D and MCPA have the lowest potential for leaching into groundwater and that mecoprop-P and dichlorprop-P have slightly higher potential. Because of limited data on adsorption and degradation of 2,4-DB and MCPB, estimation of their leaching potential was not possible. Environ Toxicol Chem 2016;35:271-286. # 2015 SETAC

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Degradation and adsorption of 14C-mecoprop (MCPP) in surface soils and in subsoil. Influence of temperature, moisture content, sterilization and concentration on degradation

Cited by 38 publications

References 12 publications

Modeling of Phenoxy Acid Herbicide Mineralization and Growth of Microbial Degraders in 15 Soils Monitored by Quantitative Real-Time PCR of the Functional tfdA Gene

Modeling of Phenoxy Acid Herbicide Mineralization and Growth of Microbial Degraders in 15 Soils Monitored by Quantitative Real-Time PCR of the Functional tfdA Gene

Potential Mineralization of Four Herbicides in a Ground Water–Fed Wetland Area

Adsorption and degradation of phenoxyalkanoic acid herbicides in soils: A review

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