Screening methods fiber-optic

To demonstrate calibration linearity and transferability using a fiber-optic probe and simple peak-area methods, the solution spectra of four solutions of phenylisocyanate in acetone were used. The mid-infrared spectrum of most isocyanates are characterized by a sharp band, sometimes exhibiting shoulders, at 2250-2285 cm which is assigned to the asymmetric stretch of the -N C=0 group. In the spectra of acetone solutions of phenylisocyanate, this band appears at 2261 cm with a substantial shoulder at 2283 cm. Figure 1 shows an expanded view of the band, displayed in a screen shot from the GRAMS peak-fitting software with two Lorentzian peaks fitted at 2261 and 2283 cm. ... 

Systematic investigations with model suspensions and with real systems lead to clarification of flocculation mechanisms. Knowledge of the applicable flocculation mechanisms is a fundamental requirement for understanding and optimizing flocculation processes. The fiber-optic flocculation sensor is, furthermore, useful as a screening method which is close to practice for developing and for assessing the effectiveness of flocculants. 

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