Performance of side-heated graphite atomizers in atomic absorption spectrometry using tubes with end caps

摘要: Abstract End caps with apertures of 2, 3 and 4 mm various thicknesses were installed in Perkin-Elmer transverse-heated graphite tubes used an atomic absorption spectrometer model 4100 ZL a THGA. The presence end reduced diffusional losses analyte matrix through the tube ends enhanced gas phase temperatures. increase sensitivity, aperture thickness 1.5–2 mm, was established for 13 elements found to be range 1.7–2.5. In general, sensitivity improvement more pronounced atomized at higher Since spectral throughput is not decreased by or larger, their will improve signal-to-noise ratios, provided times needed atomize analytes are comparable standard tubes. By careful alignment atomizer light beam, radiation emitted from does contribute significantly noise resonance lines lower than 400 nm temperatures below 2300°C. temperature evolution end-capped studied monitoring several locations direct reading pyrometer. It that heated current passing them such they same way as wall therefore there relatively small gradients entire during heating. background absorbance Na(SO4)2 NaCl obtained consequently signal-to-background ratios superior former.