Literature DB >> 16002124

Mitigation of azinphos-methyl in a vegetated stream: comparison of runoff- and spray-drift.

J M Dabrowski1, E R Bennett, A Bollen, R Schulz.   

Abstract

The effectiveness of aquatic macrophytes in reducing runoff- and spray-drift-induced azinphos-methyl (AZP) input was compared in a vegetated stream. Water, sediment and plant samples were taken at increasing distances from a point of input during a spray-drift event and two runoff (10 and 22 mm/day) events. Peak concentrations of AZP decreased significantly (R2=0.99; p<0.0001; n=5) from 0.24 microg/l to 0.11 microg/l during the 10mm runoff event. No reduction took place during the 22 mm event. AZP concentrations were reduced by 90% following spray-drift input, with peak concentrations decreasing significantly (R2=0.93; p=0.0084; n=5) from 4.3 microg/l to 1.7 microg/l with increasing distance from the point of input. Plant samples taken after the spray-drift event showed increased AZP concentrations in comparison to before the event indicating sorption of the pesticide to the macrophytes. Although peak concentrations of AZP were as effectively mitigated during the 10mm runoff event as during the spray-drift event, predictive modelling revealed that maximum concentrations expected during a worst-case scenario 10mm runoff event (0 days after application) are an order of magnitude lower than what can be expected for a worst-case spray-drift and 22 mm runoff event, suggesting that spray-drift-derived pesticide concentrations are more effectively mitigated than those of runoff.

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Year:  2005        PMID: 16002124     DOI: 10.1016/j.chemosphere.2005.05.021

Source DB:  PubMed          Journal:  Chemosphere        ISSN: 0045-6535            Impact factor:   7.086


  2 in total

1.  Experiments in water-macrophyte systems to uncover the dynamics of pesticide mitigation processes in vegetated surface waters/streams.

Authors:  Christoph Stang; Nikita Bakanov; Ralf Schulz
Journal:  Environ Sci Pollut Res Int       Date:  2015-09-03       Impact factor: 4.223

2.  Probabilistic risk assessment of insecticide concentrations in agricultural surface waters: a critical appraisal.

Authors:  Sebastian Stehle; Anja Knäbel; Ralf Schulz
Journal:  Environ Monit Assess       Date:  2012-12-12       Impact factor: 2.513

  2 in total

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