The gas absorption efficiency of the PPWD for HF, HCl, and HNO3 was found
to be nearly 100% at the sampling flow rate of 5 L/min.
In addition, the PPWD coupled with an ion chromatograph (model 861, Metrohm AG, Herisau, Switzerland) (PPWD-IC) was studied for online monitoring of CH3COOH at 0.05–0.17 ppmv