Agriculture Reference
In-Depth Information
Spectroscopy
Spectroanalytical procedures are nowadays used for determination of
concentration of elements in solutions. Atomic absorption spectroscopy
(AAS) is one of such quantitative procedures employing the absorption of
optical radiation (light) by free atoms in the gaseous state. AAS can be used
to determine over 70 different elements in solution or directly in solid
samples
Based on Beer-Lambert law, it requires standards with known analyte
content to establish the relation between the measured absorbance and the
analyte concentration. The principle of AAS lies on promoting the
electrons of the atoms into higher orbital (excited state) for a few
nanoseconds by absorbing a defined quantity of energy (i.e., radiation of a
given wavelength) which is specific to a particular electron transition in a
particular element because, in general, each wavelength corresponds to
only one element
(continued)
Search WWH ::




Custom Search