The Functional Form of the Emulsion Calibration Curve.
Woodyard-JR; Piper-BC; Stever-KR
Appl Spectros 1979 Jan; 33(1):25-28
The federal Bureau of Mines has derived a mathematical expression for the emulsion calibration curve used in optical emission spectroscopy. Employing a two-step preliminary curve method, an approximation of the first derivative of the calibration curve is formed and integrated. The final equation is I = (1 + bs) -a where I is the line intensity, s is the transform that linearizes the preliminary curve, and a and b are constants related to the slope and y-intercept of the linearized preliminary curve. The transform s must be determined for each emulsion and plate reader combination, but will have a form closely related to the seidel transform. Use of this equation eliminates the need to develop percent transmittance series and affords the advantage that only one linear regression analysis, without iterative procedures, is required. Errors in data input can be detected and corrected at any stage of program operation, thereby allowing the analyst to calibrate completely a set of plates in about 30 minutes.
Appl. Spectros., V. 33, No. 1, Jan. 2, 1979, PP. 25-28