The determination of selenium by atom-trapping atomic absorption spectrometry

Determination of lead by hydride generation atom trapping flame atomic absorption spectrometry

“…Atom trapping approaches that involve the collection and in situ preconcentration of analyte using a slotted silica and quartz tube were first demonstrated by Watling 32 and Lau et al, 33 and since then have attracted considerable interest to achieve lower detection limits by FAAS. [34][35][36] The improvement in sensitivity was about 3-to 5-fold for a number of volatile elements, including Pb, Cd, Bi, Co, Mn, Ag, As, Sb, Cu and Se, when the mist of sample solution was continuously introduced to a slotted quartz tube atom trap. 32 Trapping the analyte vapor over a period of time by condensation on the exterior walls of a water-cooled silica tube afforded better sensitivity by factor of 10-50.…”

Interference studies in slotted silica tube trap technique

“…It was suggested that these coatings greatly increased the surface area whilst simultaneously allowing some of the analyte species to become sequestered in the interstitial spaces of the coating, thus prolonging the release time as indicated by the broader peaks. 6 Interference by major elements on the determination of Se was studied extensively by Lau et al 11 and methods to minimize interferences were examined, including the use of a double tube arrangement. The basis of this design was to deposit the interferents on a cold tube very close to the primary reaction zone knowing that analyte was trapped efficiently when the cold tube was higher up in the flame.…”