5 edition of Atomic absorption spectrochemical analysis found in the catalog.
De tekst werd voor de vertaling herzien.Lit. opg.: p. 307-314.Vert. van: Atomno-absorbt͡sionnyĭ analiz (Fizika i technika spektralʹnogo analiza).
|The Physical Object|
|Pagination||xvi, 61 p. :|
|Number of Pages||48|
nodata File Size: 9MB.
An increase in sensitivity may be realized by adding a low molecular weight alcohol, ester, or ketone to the solution, or by using an organic solvent. The ionization of an element in the nitrous oxide-acetylene flame can be readily calculated by taking absorption readings, provided that relatively sensitive atom and Atomic absorption spectrochemical analysis resonance lines are available. Walsh ; authorized translation by J. Guystav Kirchoff and Robert Bunsen first used atomic absorption spectroscopy—along with atomic emission—in 1859 and 1860 as a means for identify atoms in flames and hot gases.
The principal advantage of flame atomization is the reproducibility with which the sample is introduced into the spectrophotometer. An increase in sensitivity may be realized by adding a low molecular weight alcohol, ester, or ketone to the solution, or by using an organic solvent. 9 nm with a slit width of 1. If the identity of the matrix interference is unknown, or if it is not possible to adjust the flame or furnace conditions to eliminate the interference, then we must find another method to compensate for the background interference.
The instrument in my lab, for example, includes five algorithms. 1995-09-20 JP JP24137595A active Granted• There are two reasons for poor atomization efficiency. The light beam concentrated on the central portion of the electrothermal type sample atomizing apparatus 3 is concentrated on a central portion of the flame produced in a burner type sample atomizing apparatus 5. Flame emission requires a dissolved sample.
238000005755 formation reaction Methods 0.
Applying a potential across the electrodes ionizes the filler gas. After drying and extracting the sample, a 11. Atomization is achieved in three stages. A liquid—liquid extraction using an organic solvent and a chelating agent is frequently used to concentrate analytes.
There is, however, an important additional need in atomic absorption spectroscopy—we must covert the analyte into free atoms. An inert gas carries the volatile hydride to either a flame or to a heated quartz observation tube situated in the optical path. Electrothermal atomization provides a significant improvement in sensitivity by trapping the gaseous analyte in the small volume within the graphite tube.
The most common means for introducing samples into a flame atomizer is a continuous aspiration in which the sample flows through the burner while we monitor the absorbance. Describe the appropriate matrix for the external standards and for the blank? A Cu hollow cathode lamp has several emission lines, the properties of which are shown in the following table.
Subtracting the absorbance for the D 2 lamp from that for the hollow cathode lamp gives a corrected absorbance that compensates for the background interference.
The ordinary atomic absorption photometer is incapable of detection with high accuracy of such a small limit of detection.
Therefore, an ac amplifier is used for amplifying the output signal of the photodetector to eliminate the white light emitted by the cuvette.