A relatively new analytical instrument for the measurement of 5-day biochemical oxygen demand (BOD_5), chemical oxygen demand, total suspended solids (TSS), total organic carbon (TOC), nitrates and surfactants has been developed commercially. It is based on the use of ultraviolet spectrophotometry and a deterministic approach to analyze the sample's spectrum by comparing it with a series of historical reference spectra. Using standard methods for the measurement of BOD_5, TSS and TOC as true values, the use of this instrument was evaluated. The samples tested were obtained from both wastewater and water treatment facilities. Results indicate that the BOD_5 measurement performed best. There was no correlation found for TSS or TOC.
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