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Atomic absorption spectrophotometer and method of analysis by atomic absorption spectrophotometry
.Spectrochimica Acta, Vol. 428, No. 8, pp. v-vi, Printed in Great Britain
1987 0
0584-8547/87 $3.00 + 0.00 1987 Pergamon Journals Ltd
NEW PATENTS This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest nrofiles develoned bv the Editors. Further information about Pereamon PATSEARCH@ can be obtained from Pergamon InfoLine *Inc., 1340 Old Chain Bridge Road, McLean: Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4634277
4640677
ATOMIC ABSORPTION SPECTROPHOTOMETER AND METHOD OF ANALYSIS BY ATOMIC ABSORPTION SPECTROPHOTOMETRY
GAS CONTROL DEVICE FOR CONTROLLING THE FUEL GAS AND OXIDIZING AGENT SUPPLY TO A BURNER IN AN ATOMIC ABSORPTION SPECTROMETER
Trevor J Stockdale, Cambridge, United dom assigned to U S Philips Corporation
King-
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.
Bernhard Huber, Uberlingen, Federal Republic Of Germany assigned to Bodenseewerk PerkinElmer 8z Co GmbH The present invention is directed to a gas control device for controlling the fuel gas and the oxidizing agent supplied to a burner in an atomic absorption spectrometer, which includes a first restrictor and a first pressure regulator for the fuel gas line, and a second restrictor and a second pressure regulator of the oxidizing agent line, the regulators being connected upstream of the restrictors, respectively, and servomotors for reproducibly adjusting the pressure settings of the pressure regulators, respectively.
4641968 MOBILE SPECTROMETRIC APPARATUS Mark E Grandy assigned to Baird Corporation An improved apparatus for the on site spectrometric analysis of metallic parts in an air gap is disclosed. The apparatus essentially comprises a probe to be positioned on the part, a mobile unit including a current-pulse generator for the probe to excite the part for analysis of its chemical composition in a direct reading optical emission spectrometer contained in the unit, and a flexible optical cable coupling the probe to the unit. The
1987 0
0584-8547/87 $3.00 + 0.00 1987 Pergamon Journals Ltd
NEW PATENTS This Section contains abstracts (without graphics) of recently issued United States patents and published patent applications filed from over 30 countries under the Patent Cooperation Treaty. This information was obtained from recent additions to the Pergamon PATSEARCH@ online database in accordance with interest nrofiles develoned bv the Editors. Further information about Pereamon PATSEARCH@ can be obtained from Pergamon InfoLine *Inc., 1340 Old Chain Bridge Road, McLean: Virginia 22101 U.S.A. Copies of complete patents announced in this Section are available from Pergamon InfoLine Inc. for $8 per copy. Payment with order is required. Orders outside North America add $2 for air postage. Order by patent number for Pergamon InfoLine only.
4634277
4640677
ATOMIC ABSORPTION SPECTROPHOTOMETER AND METHOD OF ANALYSIS BY ATOMIC ABSORPTION SPECTROPHOTOMETRY
GAS CONTROL DEVICE FOR CONTROLLING THE FUEL GAS AND OXIDIZING AGENT SUPPLY TO A BURNER IN AN ATOMIC ABSORPTION SPECTROMETER
Trevor J Stockdale, Cambridge, United dom assigned to U S Philips Corporation
King-
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.
Bernhard Huber, Uberlingen, Federal Republic Of Germany assigned to Bodenseewerk PerkinElmer 8z Co GmbH The present invention is directed to a gas control device for controlling the fuel gas and the oxidizing agent supplied to a burner in an atomic absorption spectrometer, which includes a first restrictor and a first pressure regulator for the fuel gas line, and a second restrictor and a second pressure regulator of the oxidizing agent line, the regulators being connected upstream of the restrictors, respectively, and servomotors for reproducibly adjusting the pressure settings of the pressure regulators, respectively.
4641968 MOBILE SPECTROMETRIC APPARATUS Mark E Grandy assigned to Baird Corporation An improved apparatus for the on site spectrometric analysis of metallic parts in an air gap is disclosed. The apparatus essentially comprises a probe to be positioned on the part, a mobile unit including a current-pulse generator for the probe to excite the part for analysis of its chemical composition in a direct reading optical emission spectrometer contained in the unit, and a flexible optical cable coupling the probe to the unit. The