The multi-group gas distribution system was used to dilute the permanent gas components in the high-purity gas,and the standard gases of different concentrations obtained were detected by pulsed helium ionized gas chromatograph(GC-PDD).The experimental results show that PDD has high sensitivity and good linearity,which can realize the detection of ultra-low-concentration samples,and further verifies that the actual minimum detection limit of PDHID can reach the level of ng/g(10-9).
multi-group gas distribution systempulsed discharge helium ionization detectordetection limitsensitivity
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