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Sci Total Environ. 2015 Dec 1;536:68-71. doi: 10.1016/j.scitotenv.2015.07.047. Epub 2015 Jul 18.

Re-evaluation of groundwater monitoring data for glyphosate and bentazone by taking detection limits into account.

Author information

1
Ålegårdsvej 29, 2740 Skovlunde, Denmark.
2
Nutrition, Exercise and Sports, University of Copenhagen, Rolighedsvej 26, 1958 Frederiksberg C, Denmark.
3
Mathematics and Statistics, University of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand.
4
SEGES P/S, Crops & Environment, Agro Food Park 15, 8200 Aarhus N, Denmark.
5
Plant and Environmental Sciences, University of Copenhagen, Hoejbakkegaard Alle 13, 2630 Taastrup, Denmark. Electronic address: jcs@plen.ku.dk.

Abstract

Current regulatory assessment of pesticide contamination of Danish groundwater is exclusively based on samples with pesticide concentrations above detection limit. Here we demonstrate that a realistic quantification of pesticide contamination requires the inclusion of "non-detect" samples i.e. samples with concentrations below the detection limit, as left-censored observations. The median calculated pesticide concentrations are shown to be reduced 10(4) to 10(5) fold for two representative herbicides (glyphosate and bentazone) relative to the median concentrations based upon observations above detection limits alone.

KEYWORDS:

Contaminants; Drinking-water supply; Groundwater; Herbicides

PMID:
26196070
DOI:
10.1016/j.scitotenv.2015.07.047
[Indexed for MEDLINE]

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