Abstract
A prototype of a low-cost automated analyser capable of in situ operation next to a water body is described. The analyser can determine levels of phosphorus (orthophosphate) and nitrogen (nitrate+nitrite), along with pH and temperature, transmitting the results to a remote station via wireless internet. Phosphorus and nitrogen determinations are carried out by means of photometric methods, implemented in a pulsed-flow system. For control and data acquisition the open-source Arduino platform of microcontrollers was used. The system runs on rechargeable batteries, with the possible support of a solar panel. Preliminary evaluation of the analytical methods carried out in the laboratory showed figures of merit fit for the purpose. A field evaluation is foreseen in the near future, where the analyser will be tested under real conditions. This type of instruments is considered to be potentially useful in environmental analysis.
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