Inexpensive, light-emitting, diode-based photometer for determining copper in hard-chromium plating baths

An infrared-light-emitting-diode-based photometer has been developed for use in measuring copper concentrations in hard-chromium and other plating baths. This device provides accuracy comparable to that of more sophisticated techniques, is easy to operate, requires no sample preparation, creates no waste, and can be assembled from a small number of simple and inexpensive components.