I. Vovk et al., Investigation by photoacoustic spectroscopy of the effect of drying conditions on the depth-distribution of compounds on TLC plates, J PL CHROM, 11(5), 1998, pp. 379-382
Photoacoustic spectroscopy (PAS) has been used to investigate the influence
of the plate-drying process (in a dryer, in a current of warm air, or in a
mbient air) on the depth-distribution of compounds inside the sorbent layer
of TLC plates. The results obtained by PAS studies from different TLC plat
es were compared with those obtained by reflectance mode slit-scanning dens
itometry Use of different drying conditions resulted in significant differe
nces between PAS signals obtained from the same compound in the uppermost 6
2 mu m layer of the sorbent. The largest differences were between the plate
s dried in ambient air and those dried in a dryer or in a current of warm a
ir.