Geosmin and Methylisoborneol in Drinking Water

Keywords drinking water off odour contamination SPME headspace automation quantitation 

Past analytical techniques to determine concentrations of these off odour compounds used closed-loop stripping (CLS) and P T sample preparation that provided the required sensitivity but have been either time consuming (CLS) or required a significant technical effort (P T) (Preti et al., 1993 McMillan, 1994). SPME has shown in many applications to be a very versatile and sensitive 

GC Method System Thermo Scientific Trace GC Ultra 

All standards were dissolved in methanol as solvent. The internal standard iso-propylmethoxypyrazine was spiked to each sample at 300 ppt level. The addition of 30% (w/v) salt to the sample was used for salting out the analytes. The reproducibility of the SPME headspace analysis depended on the same methanol content in each of the samples. The incubation temperatures and time were varied to maximize analyte concentrations. 60 C for 30 min was found optimal. Each 

SPME as a solventless sample preparation technique includes extraction, concentration and sample GC injection of the analytes in a single procedure. Automation of this sample preparation process offers a valuable tool to greatly extend sample throughput. SPME has gained widespread acceptance as the technique of preference for the analysis of these odour compounds. 

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