Optics: measuring and testing – With sample preparation
Patent
1973-10-23
1976-05-04
Smith, Alfred E.
Optics: measuring and testing
With sample preparation
356 73, 356 87, G01N 100
Patent
active
039543366
ABSTRACT:
A method of chemical analysis of a sample in solution in which the optical density of the solution is modified by addition of a dye to the solution, and the modified optical density is utilized in determining the concentration of the sample in the solution. That determination is effected by measuring the optical density of the dyed solution and applying a value thereto, and then comparing that value with a predetermined value which corresponds to a particular sample concentration. The actual sample concentration is assigned a value in accordance with the results of that comparison, and that assigned value is employed in determining the concentration of a particular element in the sample by spectral analysis. Apparatus for carrying out the method includes a first spectrophotometer for determining the optical density of the sample solution, and a second spectrophotometer for applying a value to the concentration of the element of interest in the atomized sample. The two spectrophotometers are connected through correction means whereby the element concentration value is corrected in accordance with the variations between the measured optical density value and the predetermined optical density value.
REFERENCES:
patent: 2811891 (1957-11-01), Roddy
yoe, Photometric Chemical Analysis, Vol. 1, John Wiley & Sons, Inc., New York, 1928, pp. 412-414.
Baird Graeme Alexander
Marshall Nicholas James
Australian Selection
Koren Matthew W.
Smith Alfred E.
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