Screening analysis of river seston downstream of an effluent discharge point using near-infrared reflectance spectrometry and wavelet-based spectral region selection

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• 作者：Vâ ; nia Maria de Medeiros ; Má ; rio Cé ; sar Ugulino Araú ; jo ; Roberto Kawakami Harrop Galvã ; o ; Edvan Cirino da Silva ; Teresa Cristina Bezerra Saldanha ; Ilda Antonieta Salata Toscano ; Ma
• 关键词：Industrial effluents ; River Seston ; Screening analysis ; Near-infrared reflectance spectrometry ; Spectral range selection ; Wavelet transform
• 刊名：Water Research
• 出版年：2005
• 出版时间：2005
• 年：2005
• 卷：39
• 期：13
• 页码：3089-3097
• 全文大小：334 K

文摘

A methodology for screening analysis of river seston downstream of an industry effluent by using near-infrared reflectance spectrometry was developed. A wavelet transform (WT)-based strategy is used to select a spectral region in which the effect of the effluent on the optical properties of the seston is more evident. The methodology was applied to samples from the River Mumbaba in northeast Brazil. Four sites were monitored: two upstream (1 and 2), one at the discharge point of the effluent (3), and another downstream (4). Soft Independent Modelling of Class Analogies (SIMCA) models were built for site 1 and were then applied to the classification of samples from sites 2 and 4. The results reveal that the WT-based spectral region selection is essential to ensure good sensitivity and specificity with respect to the detection of events associated to the effluent discharges at site 3. In fact, the changes in site 4 caused by the effluent are masked by other environmental factors when the full spectrum is employed.