Multispectral colorimetric portable system for detecting metal ions in liquid media

Nowadays the metal ions detection and classification in-site and in real time in river and like environment are very important task for environmental control. In this sense, the present work proposed a portable multispectral spectrometer based in the multispectral photodetector eliminating in this way the complex and expensive conventional monochromator system. The acquisition, control and processing of signals are performed based on FPGA technology, which was developed based on virtual instrumentation software (NI LabView ®), manufactured by National Instruments, NI model myRIO-1900. This portable spectrometer showed to have the same performance than to bench spectrophotometer when these are applied to metal ions detection and classification by using the PAN molecules as active indicator. The metal ions detection and classification with bench spectrometer and portable spectrometer showed to be efficient when it was used three-dimensional chromaticity diagrams. These results pointed out that the proposed portable spectrometer will be used successfully for in-situ and real time metal ions monitoring in river and like environment.