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Experimental study of precipitating systems; computerised analysis of the optical transmittance and associated noise
J A Poce-Fatou1, R Alcántara, J J Gallardo
1Departamento de Química Física, Facultad de Ciencias, Universidad de Cádiz, Puerto Real, Spain. juanantonio.poce@uca.es
Abstract:
The change of the transmittance in a precipitant system has been measured by using a focused laser beam into a precipitation cell in which the precipitate was generated by an injection technique. We have monitored the evolution of the transmittance on several precipitation processes with different chemicals (PbI2, PbSO4, BaSO4 and BaC2O4) and quantities of precipitated mass (20.0, 17.5, 15.0, 12.5 and 10.0 mg). The noise associated to the transmittance signal has been obtained by a numerical procedure based on computer analysis, finding that it provides information about particle shape features and nucleation kinetics.