The use of the multiple linear regression program for the derivation of influence coefficients destroys the data bank in the Philips PW 1450/10 spectrometer computer and interrupts analysis. Consideration of the basis of a-coefficients as applied to relatively dilute solutions leads to methods of avoiding the use of this program. Linear regression involving a single independent variable and simple algebraic expressions can be used to derive the coefficients. The requirements for converting a-coefficients applicable to one solvent for use in a different solvent are described.
A spectrochemical method has been evolved for the determination of trace elements in soils and plants with the objects of reducing the microphotometry involved in the variable internal standard method and of increasing the throughput of samples. A 3-step filter replaces the step sector and evaluation is achieved from an emulsion calibration curve prepared from step filter data using the Respektra calculator. The errors involved in certain stages are studied, and the resulting method shows an accuracy comparable to the original.
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