简介:For complex and difficult matrices the technique DMI
(difficult matrix introduction)* is a powerful analytical
tool. In the present contribution the DMI technique is
applied for screening of washing powders. Pattern
简介:For complex and difficult matrices the technique DMI
(difficult matrix introduction)* is a powerful analytical
tool. In the present contribution the DMI technique is
applied for screening of washing powders. Pattern
recognition, identification of unknown compounds as
well as quantification of known ingredients can be done
without any sample preparation. If it is also necessary to
identify the fragrances in the perfumed products it can
be done just in a single run during the normal screening
because the DMI-GC-MS is also coupled to a sniffing
port (‘PHASER’). At the end of the GC column the
carrier gas flow is split into two flows. One flow is
directed to the MS detector whereas the other is sent to
the PHASER. Retention times for the two detection
devices are hence virtually identical.
For each injection of washing powder the micro-vial in
the liner have to be changed to automated this step a
LINEX (liner exchanger) is used.详细>