Taken from Thaindian News
"Underground CO2 leakage could contaminate drinking water"
A new study has revealed that leakage of carbon dioxide injected deep underground to help fight climate change could turn up in drinking water aquifers near the surface, driving up levels of contaminants in the water tenfold or more in some places. “We found the potential for contamination is real, but there are ways to avoid or reduce the risk,” said Robert B. Jackson at Duke University... After a year’s exposure to the CO2, analysis of the samples showed that “there are a number of potential sites where CO2 leaks drive contaminants up tenfold or more, in some cases to levels above the maximum contaminant loads set by the EPA for potable water,” Jackson said. “Along with changes in carbonate concentration and acidity of the water, concentrations of manganese, iron and calcium could all be used as geochemical markers of a leak, as their concentration increase within two weeks of exposure to CO2,” Jackson said. The study appears in the online edition of the journal Environmental Science & Technology.