Use of Substitute Standards in Infrared Differential Spectrophotometry

Washburn, William H.; Mahoney, Michael J.

doi:10.1021/ac60138a013

Cited by 5 publications

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“…Alternatively such procedures may be used to remove the absorption bands due to the major constituent of a mixture so that the concentrations of minor components can be determined from the difference spectrum (5). When the reference material being used for the compensation contains traces of impurities that are to be determined in the sample being analyzed, it is possible to use a substitute compound for the compensation which shows absorption bands similar to the compound being compensated (7). The effects of increasing the cell thickness or of using wider slit widths to obtain greater sensitivity in such cases have been discussed by Powell (6).…”

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Determination of Minor Components by Differential Infrared Spectrometry.

Blakeway¹,

Puttnam²

1963

Anal. Chem.

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for values of the optical rotation less than 0.1 radian we arrive at the equality Rv ß"• ß(, + " ß<-! + 1)°^'Equation 29 has two measured quantities, Rn and R»+d but also two unknowns Rv°a nd Rrt+i>0. For convenience we may now restrict the optical rotations to that range where the fí°'s are linear functions of the angular rotation. The error involved here may be estimated from the equations given by Carroll, Tillem, and Freeman (1). For cases where this restriction cannot be met, higher order terms other than the first may be used for the following equations: ß °= 2 tan . [ 7? ] and ß + )0 = 2 tan 9. [o¡o(>? + 1)] Combining Equation 29with the above equations for and ß(,+ 1)°o ne obtains

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