Sources and behavior of perchlorate ions (ClO 4 − ) in chalk aquifer of Champagne-Ardenne, France: preliminary results
2018
Abstract. Perchlorate ( ClO 4 - ) is an environmental contaminant of growing
concern due to its potential human health effects and widespread occurrence
in surface water and groundwater. Analyses carried out in France have
highlighted the presence of ClO 4 - in drinking water of
Champagne-Ardenne (NW of France), with two potential sources suspected: a
military source related to the First World War and an agricultural source
related to the past use of Chilean nitrates. To determine the sources of
ClO 4 - in groundwater, major and trace elements, 2 H and
18 O , ClO 3 - and ClO 4 - ions and a list of
39 explosives were analyzed from 35 surface water and groundwater sampling
points in the east of the city of Reims. ClO 4 - ions were found
in almost all sampling points (32 out of 35) with a max value of
33 µg L −1 . ClO 4 - concentrations were highest in
groundwater ranging from 0.7 to 33 µg L −1 (average value of
about 6.2 µg L −1 ) against from 0.5 to
10.2 µg L −1 in surface water (average value of about
2.7 µg L −1 ). Most of the water samples showing high
ClO 4 - levels ( > 4 µg L −1 ) were collected near
a military camp, where huge quantities of ammunitions have been used, stored
and destroyed during and after the First World War.
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