DSD-DNPH Passive Sampling Device

High Efficiency Diffusive Sampler for Aldehydes & Ketones in Indoor Air

The device comprises of a porous polyethylene tube which acts as the diffusive membrane, to which is attached a small polypropylene syringe used for the elution of the analytes from the adsorbent. Because the diffusive membrane is round, it permits exposure from all sides. Silica gel coated with 2,4-dinitrophenylhydrazine (DNPH) acts as the adsorbent. Aldehydes and ketones diffuse through the membrane reacting with DNPH to form stable derivatives. The DNPH-derivatives are later eluted with acetonitrile and analyzed by high performance liquid chromatography (HPLC).