Impinger-Sampling Coupled to HPLC by a Modified Autoinjector-Interface

The work desccribes a device, which permits the use of a small glass impinger for the automatic sampling and enrichment of air pollutants "on line" with HPLC separation. The impinger is situated in a modified autosampler instead of the vial rack whhich, using a appropriately modified software, permits the automatic sampling of the pollutants by bubbling air through an adequate reaction solution. This solution with the trapped/reacted compounds is than sucked up by the autosampler syringe and injected into an HPLC-column. After several steps involving cleaning of the impinger, using the mobile phase or a specially chosen solvent, the impinger is ready for a new analysis. With a tandem configuration, which permits analysis of a first sample buring the sampling of a second one, a rather high analysis frequency is obtained. The technique was tested determining ng/l-concentrations of aldehydes and ketones in ETS (Environmental Tobacco Smoke)-contaminated atmospheres, sucking the air through solutions of 2,4-Dinitrophenyl-hydrazine (DNPH) and Phosphoric Acid in N.N-Dimethylacetamid. The resulting DNP-Hydrazones were injected into an isocratic Acetonitril/Water (70/30 V/V) mobile phase and then detected with an UV-monitor at 360 nm. All sampling parameters like DNPH- and acid-concentrations, impinger aie flow, sampling time, derivatisation speed, blanc values ect. are discussed.

SCHLITT Helmut; 

1996-06-05

JRC13263

https://publications.jrc.ec.europa.eu/repository/handle/JRC13263,