Concept: High resolution continuum source atomic absorption spectrometry (HR-CS-AAS) in the analyticaltechnique vocabulary

Concept URI	http://dd.eionet.europa.eu/vocabulary/aq/analyticaltechnique/HR-CS-AAS
Preferred label	High resolution continuum source atomic absorption spectrometry (HR-CS-AAS)
Definition	When a continuum radiation source is used for AAS measurement it is indispensable to work with a high-resolution monochromator. The resolution has to be equal to or better than the half width of an atomic absorption line (about 2 pm) in order to avoid losses of sensitivity and linearity of the calibration graph. These spectrometers use a compact double monochromator with a prism pre-monochromator and an echelle grating monochromator for high resolution. A linear charge coupled device (CCD) array with 200 pixels is used as the detector. The second monochromator does not have an exit slit; hence the spectral environment at both sides of the analytical line becomes visible at high resolution. As typically only 3–5 pixels are used to measure the atomic absorption, the other pixels are available for correction purposes. One of these corrections is that for lamp flicker noise, which is independent of wavelength, resulting in measurements with very low noise level; other corrections are those for background absorption, as will be discussed later.
Notation	HR-CS-AAS
Status	Valid
Status Modified	2013-03-22
Accepted Date	2013-03-22
Not Accepted Date
Scope note	Analysis of Pb, As, Cd, Ni (Reference)