The Chemical Oxygen Demand (COD) is an important parameter for the evaluation of the oxidizable matter in water and effluent in general. Although laborious and timeconsuming, the Standard Method for COD determination employs very toxic pollutants, i. e., dichromate and mercury, which are now being gradually avoided or replaced. In general, the organic load of effluents usually shows absorbance in the UV-visible region, as a result of the presence of absorbing groups in its organic constituents, e. g., in the case of aromatic compounds, they show the well-known UV fingerprint. In this study, an attempt has been made to find a deconvolution correlation between the COD values of effluent samples from the Hospital of the Federal University of Santa Maria (HUSM) and their integrated UV-absorbances. Experimental procedures reveal a correlation of +0.567, classified as moderate positive and with a significancy of 0.0001, between the estimated and the determined values. Hence, a COD-estimation for hospital effluents is proposed, through a simple spectrophotometric measurement of the integrated absorbance in the 285 -295 nm range.
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