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Perchlorate and ion chemistry of road runoff

Perchlorate and ion chemistry of road runoff Environmental context. Recognising that road flares and air bags may contribute perchlorate to road runoff, we analysed perchlorate in runoff from two accident-prone suburban highways during a period of five rain events. This runoff reaches recharge basins where it then infiltrates into the groundwater. The concentrations of perchlorate averaged ~2 μg L –1 , high enough to be of concern if the drinking water standard for perchlorate were in the low μg levels. Abstract. First flush samples of road runoff were sampled in April 2006 corresponding with five rain events at 12 catch basins and two recharge basins in Suffolk County, NY. Most runoff here is directed into recharge basins or sumps that drain directly into the sole source aquifer. Thus, contaminants from road runoff can contaminate groundwater. In addition to ClO 4 , we present data for Cl, Na, Br, Sr, and nitrogen as nitrate (N-NO 3 ) as they are the dominant ions in the most probable sources of ClO 4 to road runoff, presumably road flares, road salt, air bags and road-side fertilizers. Correlations between the ions indicate that road salt elevates concentrations of Na, Br and Cl in road runoff. The average ClO 4 value is 2.18 ± 0.66 (standard error of the mean) μg L –1 for the catch basins and 2.98 ± 0.87 μg L –1 for the two recharge basins. Excess ClO 4 in the present study appears mainly from road flares. On average, only 47% of the ClO 4 in the catch basins and 11% in the recharge basins can be accounted for by bulk precipitation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Environmental Chemistry CSIRO Publishing

Perchlorate and ion chemistry of road runoff

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References (17)

Publisher
CSIRO Publishing
Copyright
CSIRO
ISSN
1448-2517
eISSN
1449-8979
DOI
10.1071/EN08085
Publisher site
See Article on Publisher Site

Abstract

Environmental context. Recognising that road flares and air bags may contribute perchlorate to road runoff, we analysed perchlorate in runoff from two accident-prone suburban highways during a period of five rain events. This runoff reaches recharge basins where it then infiltrates into the groundwater. The concentrations of perchlorate averaged ~2 μg L –1 , high enough to be of concern if the drinking water standard for perchlorate were in the low μg levels. Abstract. First flush samples of road runoff were sampled in April 2006 corresponding with five rain events at 12 catch basins and two recharge basins in Suffolk County, NY. Most runoff here is directed into recharge basins or sumps that drain directly into the sole source aquifer. Thus, contaminants from road runoff can contaminate groundwater. In addition to ClO 4 , we present data for Cl, Na, Br, Sr, and nitrogen as nitrate (N-NO 3 ) as they are the dominant ions in the most probable sources of ClO 4 to road runoff, presumably road flares, road salt, air bags and road-side fertilizers. Correlations between the ions indicate that road salt elevates concentrations of Na, Br and Cl in road runoff. The average ClO 4 value is 2.18 ± 0.66 (standard error of the mean) μg L –1 for the catch basins and 2.98 ± 0.87 μg L –1 for the two recharge basins. Excess ClO 4 in the present study appears mainly from road flares. On average, only 47% of the ClO 4 in the catch basins and 11% in the recharge basins can be accounted for by bulk precipitation.

Journal

Environmental Chemistry – CSIRO Publishing

Published: Mar 3, 2009

Keywords: groundwater, New York, non-point source, road flares, road salt.

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