This application note describes the analysis of very low levels (sub ppm) of 1,2-dichloroethane in which a special sample concentratior was used in conjunction with the Varian CP-4900 DMD Micro-GC with differential mobility detector.
This document details a method for analyzing very low levels (sub-ppm) of 1,2-dichloroethane in air. It combines the Varian CP-4900 Micro-GC equipped with a Differential Mobility Detector (DMD) and an Enrichment and Desorption Unit (EDU) Sample Concentrator to achieve detection limits in the ppb range. The text explains that while the standard thermal conductivity detector (TCD) can detect low ppm levels, the DMD offers superior sensitivity and selectivity, further enhanced by sample enrichment.
| Desorption temperature | 200 °C |
|---|---|
| DMD Sensor temperature | 80 °C |
| DMD Flow rate | 450 mL/min |
| DMD Rf voltage | 1200 V |
| Oven temperature | 100 °C |
| Carrier gas | He |
The linear behavior of sample concentration demonstrated a correlation coefficient of 0.9979 when increasing sampling time.
The results of 14 consecutive runs remain within a 10% RSD (Relative Standard Deviation).