Abstract
Benzoic acid (BA) and benzylidene acetone (BDA), together with polyethylene glycol, are used as additives in electroplating zinc baths. The simultaneous BA and BDA determination is proposed by applying partial least-squares regression to the ultraviolet (UV)-visible spectra between 216 and . Concentrations between 1.02 and BA and 0.100 and BDA can be determined. Several proposals to estimate the multivariate limit of detection (LOD) have been applied, including the use of the net analytical signal, found vs added plots, and the use of multivariate standard deviation. Depending on the method used, the values of LOD found the range between 0.1 and for BA and 0.01 and for BDA. The multivariate method has been applied to follow BA and BDA concentrations along a Zn bath life. BA concentration remains practically unchanged, but BDA concentration continuously diminishes by degradation on electrodes and by evaporation. There is a direct relation between BDA concentration and brightness of the plated piece. Thus, the proposed method can be related to brightness.
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