Sources and behavior of perchlorate ions(CIO_4~-)in challk aquifer of Champagne-Ardenne, France:preliminary results

摘要

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 CIO_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 C1O_4~- in groundwater,major and trace elements, ~2H and 18_O, C1O_3~- and C1O_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. C1O_4~- ions were found in almost all sampling points(32 out of 35)with a max value of 33 μg L~(-1) . C1_4~- concentrations were highest in groundwater ranging from 0.7 to 33 μgL~(-1)(average value of about 6.2 μgL~(-1))against from < 0.5 to 10.2 μgL~(-1) in surface water(average value of about 2.7 μgL~(-1)). Most of the water samples showing high C1O_4~- levels(> 4 μgL~(-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.