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

TY - JOUR

T1 - Re-evaluation of groundwater monitoring data for glyphosate and bentazone by taking detection limits into account

AU - Hansen, Claus Toni

AU - Ritz, Christian

AU - Gerhard, Daniel

AU - Jensen, Jens Erik

AU - Streibig, Jens Carl

N1 - CURIS 2015 NEXS 254

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

U2 - 10.1016/j.scitotenv.2015.07.047

DO - 10.1016/j.scitotenv.2015.07.047

M3 - Journal article

C2 - 26196070

SN - 0048-9697

VL - 536

SP - 68

EP - 71

JO - Science of the Total Environment

JF - Science of the Total Environment

ER -