Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1978-10-17
1982-02-09
McGraw, Vincent P.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
356417, G01N 2172
Patent
active
043147640
ABSTRACT:
A method of controlling spectroscopic analysis in which a sample in liquid concentrate form and containing an element of interest, is nebulized and carried into an analysis zone by pressurized support gas. The invention comprises regulating the flow rate of the support gas to control the density of atoms of the element present in the analysis zone so as to be within a measurable range. The flow of support gas controls sample uptake at the nebulizer, and that uptake is reduced by dividing the gas flow before the nebulizer so that one part by-passes the nebulizer but is nevertheless directed into the analysis zone so that the total gas flow to the analysis zone remains constant. In spectroscopic apparatus for carrying out that method, the gas flow rate through the nebulizer is automatically reduced when an overrange condition is detected, and a correction factor is applied to the apparatus read-out for each reduction in that flow rate so that the read-out at all flow rates is representative of the quantity of the element of interest in the sample.
REFERENCES:
"Atomic Absorption"; Bausch & Lomb; Rochester, N.Y.; Nov. 1967; The Sum of the Parts Section.
Spectro chimica Acta., vol. 29B, pp. 19-31; Jan. 1974; Pergamon Press 1974; Printed in Northern Ireland.
Analytical Chemistry, vol. 48 #11, Sep. 1976; Montaser et al., pp. 1490-1499.
Calvert, administrator by Edmund
Liddell Peter R.
Pearl, desceased Antony S.
Cole Stanley Z.
Fisher Gerald M.
McGraw Vincent P.
Varian Tectron Party Ltd.
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