M. Bates et al., AMBIENT VOLATILE ORGANIC-COMPOUND MONITORING BY DIFFUSIVE SAMPLING - COMPATIBILITY OF HIGH UPTAKE RATE SAMPLERS WITH THERMAL-DESORPTION, Analyst, 122(12), 1997, pp. 1481-1484
Field and laboratory validation studies mere carried out on a novel, h
igh uptake rate, radial diffusive sampler loaded with Carbotrap, a the
rmally desorbable adsorbent, For field experiments parallel techniques
mere employed for comparison, The goal was to assess the compatibilit
y of the device for subsequent thermal desorption and preconcentration
of the sample for analysis, Some unexpected results were obtained esp
ecially for benzene, where it was observed that, under certain conditi
ons the longer the device was exposed to an atmosphere, the less sampl
e was collected, A possible explanation for these results is put forwa
rd by applying knowledge previously acquired on saturation and competi
tivity effects, An alteration to the sampler geometry is proposed whic
h, through further laboratory and field work, is shown to overcome thi
s problem.