Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1990-02-16
1992-01-14
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01J 300, G01N 2172
Patent
active
050804855
ABSTRACT:
A method for determining concentration by means of atomic absorption spectroscopy, whereby the sample is supplied to a continuously operating atomizing device of an atomic absorption spectrometer by flow injection technique and generates a transient output signal of the atomic absorption spectrometer, comprises the method steps of supplying a calibration sample with a known concentration of the looked-for element to an atomic absorption spectrometer by flow injection technique, the concentration of the element looked-for in this sample being in a range of minimum standard deviation; storing the obtained transient calibration signal; supplying a sample which is to be analyzed and has an unknown concentration of the looked-for element to the atomic absorption spectrometer by flow injection technique and measuring a transient sample signal; forming signal ratios of the sample signal and the calibration signal at mutually corresponding predetermined moments of time; and determining the concentration of the looked-for element in the sample which is to be analyzed from these signal ratios.
REFERENCES:
patent: 3705770 (1972-12-01), Kashiki
patent: 3937577 (1976-02-01), Dorsch
patent: 4620284 (1986-10-01), Schnell et al.
Maessen, "Direct Determination of Gold, Cobalt and Lithium in Blood Plasma Using the Mini-Massmann Carbon Rod Atomizer;" Analytical Chemistry, vol. 46, #11, 9/74, pp. 1445-1449.
Bodenseewerk Perkin Elmer GmbH
Evans F. L.
Grimes Edwin T.
Hantis K. P.
Murphy Thomas P.
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