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Q: Which technique is most effective for the detection of NDMA, LC-MS or GC-MS?
JS: You can use both. The main thing to consider is to use a triple quadrupole instead of a single quad method; this gives a higher level of specificity as the molecular weight of the analytes is low. One other thing to consider with GC-MS is the high temperatures this can result in the breakdown of your samples and produce false positives, but at the moment the authorities are releasing methods on both LC- and GC-MS, so both are relevant.
Q: What diluent would you recommend using for nitrosamine analysis and why?