Optics: measuring and testing – By dispersed light spectroscopy – With sample excitation
Patent
1985-06-01
1987-01-06
Willis, Davis L.
Optics: measuring and testing
By dispersed light spectroscopy
With sample excitation
G01N 2172
Patent
active
046342770
ABSTRACT:
A method of analyzing using an atomic absorption spectrophotometer including a flame atomizer is disclosed. The method comprises the steps of (a) setting the parameters of the spectrophotometer to a set of preset values dependent on the substance to be detected, (b) setting the gas flow rate to the burner to a preset value dependent on the substance to be detected, (c) aspirating an optimization standard into the flame, (d) measuring the absorbance of the optimization standard and storing the result, (e) modifying the gas flow rate in incremental steps and at each incremental step of flow rate repeating steps (c) and (d), and comparing the new absorbance value with the stored value until a maximum absorbance measurement is found, (f) using the maximum absorbance measurement value to select one of a plurality of sets of parameters for the spectrophotometer, and (g) subsequently aspirating and measuring the absorbance of a sample using the selected set of parameters. A first set of parameters is selected if the absorbance value is less than 0.1 absorbance units, the original set of parameters is retained if the absorbance value is between 0.1 and 0.5 absorbance units, and a third set of parameters is selected if the absorbance value is greater than 0.5 absorbance units. An atomic absorbance spectrophotometer in which this method is automatically carried out under the control of a microcomputer is also set forth.
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Miller Paul R.
Turner S. A.
U.S. Philips Corporation
Willis Davis L.
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