“…For sampling of ambient air, absorber solutions have been most frequently used; these are not suited for field work, however, especially not in personal monitoring. We have previously reported the use of XAD-2 coated with 2,4-dinitrophenylhydrazine (DNPH) for the sampling of several aldehydes, including formaldehyde, acrolein, and glutaraldehyde (8,10,11). Other workers have subsequently used other DNPH-coated solid sorbents (9, [12][13][14][15].…”