Analytical wavelength

The employment of the technique suggested does not require ultra high resolution of spectrometer (in contrast to technique based on the chemical shift of X-ray line detection) and can be realized on the conventional analytical wavelength-dispersive devices. 

Compound Analytical Wavelength (pm) Path length (m) Absorbence Minimum Detectable Concentration (ppm) " (20 metre cell)... 

Brown, C.W., Lynch, P.F., Obremski, R.J., Lavery, D.S., "Matrix Representations and Criteria for Selecting Analytical Wavelengths for Multicomponent Spectroscopic Analysis", Anal. Chem. 1982 (54) 1472-1479. 

Frans, S.D., Harris, J.M., "Selection of Analytical Wavelengths for Multicomponent Spectrophotometric Determinations", Anal. Chem. 1985 (57) 2680-2684. 

The analytical wavelength has usually been chosen as that of the strongest band in the spectrum which is free from interference due to atmospheric water and CO... If more than one infra-red absorbing material is present in the air in significant concentration, the use of another analytical wavelength may be necessary. 

A simple, rapid and accurate ICP-AES method was developed for the analysis of Ca, Mg, Fe, Al, Ti in polypropylene [198]. With optimised operating parameters and analytical wavelength, RSD was below... 

Numerous other FOCS schemes have been described for heavy metals in the past 20 years (for reviews, see 113-115). In looking at the more recent literature one may state, however, that some of the newly described "chemistries" perform hardly better than the rather old commercial systems based on the use of dry reagent chemistries, with the additional advantage that they are compatible with a single instrument for read-out. In fact, some of the newer systems involve rather extensive chemistry and - worst of all -seem to strongly differ in terms of spectroscopy and analytical wavelengths so that they all require their own opto-electronic platform. On the other hand, there is substantial need for (low-cost) sensors for less common... 

The need for improved background correction performance has generated considerable interest in applying the Zeeman effect, where the atomic spectral line is split into several polarised components by the application of a magnetic field. With a Zeeman effect instrument background correction is performed at, or very close to, the analyte wavelength without the need for auxiliary light sources. An additional benefit is that double-beam operation is achieved with a very simple optical system. 

The figure below illustrates the visible absorbance spectrum of substance A, what is the appropriate analytical wavelength for determining the concentration of A ... 

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