In the case of substances with small concentrations in biological materials, liquid or gas chromatography with tandem mass spectrometry procedures have the required sensitivity. From the talked over case, a liquid chromatograph having a triple quadrupole mass spectrometer running in several response monitoring (MRM) mode was used for NPS screening. https://messiahhoojy.blogripley.com/31233160/examine-this-report-on-5f-mdmb-2201