•  VertiPak NH2/Carbograph SPE is double-layer SPE tube
    that contains both VertiPak™ Carbograph (upper layer) and
    VertiPak™ NH2 (lower layer) sorbents that separated by
    PE frit.
•  Specially used for multi-residue pesticides in foods e.g.
    vegetables, meats.
•  VertiPak™ NH2 is an aminopropyl phase that exhibits as
    weak anion exchanger for organic pigments, organic acids,
    chlorophyll.
•  VertiPak™ Carbograph is non-porous graphitized carbon
    black. Its surface contains oxygen complexs forming
    positively charged chemical heterogeneities on surface
    offering rapid primary reversed-phase interaction for  
    multiresidue pesticides.
•  Tube format is available in 7 tube sizes.
•  Tubes are packaged in zip sealing bag protective from
    moisture and light.
•  Includes a Performance report including the QC results,
    lot chromatogram and lot recovery test.