From The Stratosphere to the Rhizosphere: a Case Study in Environmental Isotope Forensics

October 05, 2023 - 16 h 00 / 18 h 00

Hôtel Dupanloup
1 rue Dupanloup
45000 Orleans


Among the many hazardous anthropogenic contaminants present in our environment, some also have natural sources.  One such contaminant is perchlorate, an oxyanion of chlorine that has many practical uses and has recently been found as an abundant component of Martian soils.  Following recognition of the widespread occurrence of perchlorate in drinking water supplies across the US during the late 1990s, efforts were made to identify its sources by measuring chlorine and oxygen isotope compositions.  Three principal sources (one synthetic and two natural) were clearly discriminated isotopically.  This attracted the attention of the environmental legal community as a potential forensic tool by which to apportion liability for contamination, leading to the introduction of perchlorate isotope data in the federal court system as a key line of evidence.  


Prof. Neil Sturchio

LE STUDIUM Visiting Researcher  

FROM: University of Delaware - USA
IN RESIDENCE AT: French Geological Survey (BRGM) - FR  

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