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    STUDIA GEOLOGIA - Issue no. 1 / 2007  
         
  Article:   TENTATIVE INVESTIGATIONS OF CHLORINE ISOTOPE RATIO.

Authors:  ANDRZEJ PELC, STANISLAV HALAS. 		 
       
         
  Abstract:  Chlorine has two stable isotopes, 35Cl and 37Cl, with natural abundances of 75.77% and 24.23%, respectively. The isotope ratio 37Cl/35Cl has been applied to tracing the circulation of chlorine compounds in the environment and their degradation in physico-chemical and biological processes. By the investigation of the δ37Cl we can distinguish the origin of Cl-bearing substances. Recently, significant differences between naturally occurring Cl-bearing compounds and anthropogenic chlorinated organic substances were confirmed (Stewart and Spivack, 2004). It is particularly interesting because chlorinated organic compounds, including the common solvents (e.g., perchloroethylene, carbon tetrachloride) are among the most frequently detected groundwater pollutants. These substances are known or suspected to be carcinogenic or mutagenic for humans. They are readily transported by groundwater and are not reduced to acceptable level (for consumption) by most water supply treatments.  
         
     
         
         
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