A greener method for analysis of nitrosamines utilising GC-NPD

There has been one or two discussions in this forum previously around the use of GC/NPD for detection and quantification of nitrosamines, based on head-space. This piece of work seems to go one stage further, removing solvents completely from the process.

A novel green HS/SPME-GC/NPD method for screening and quantification of nitrosamines in solid samples: application to losartan tablets - ScienceDirect

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What about specificity with other impurities?