The design and development of an automated flow injection instrument for the determination of arsenite [As(III)] and arsenate [As(V)] in natural waters is described. The instrument incorporates solenoid activated self-priming micropumps and electronic switching valves for controlling the fluidics of the system and a miniature charge-coupled device spectrometer operating in a graphical programming environment. The limits of detection were found to be 0.79 and for As(III) and As(V), respectively, with linear range of . Spiked ultrapure water samples were analyzed and recoveries were found to be 97%–101% for As(III) and 95%–99% for As(V), respectively. Future directions in terms of automation, optimization, and field deployment are discussed.
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