Calibration Transfer Between a Bench Scanning and a Submersible Diode Array Spectrophotometer for In Situ Wastewater Quality Monitoring in Sewer Systems

Applied Spectroscopy
Rita S BritoN D Lourenço

Abstract

Online monitoring programs based on spectroscopy have a high application potential for the detection of hazardous wastewater discharges in sewer systems. Wastewater hydraulics poses a challenge for in situ spectroscopy, especially when the system includes storm water connections leading to rapid changes in water depth, velocity, and in the water quality matrix. Thus, there is a need to optimize and fix the location of in situ instruments, limiting their availability for calibration. In this context, the development of calibration models on bench spectrophotometers to estimate wastewater quality parameters from spectra acquired with in situ instruments could be very useful. However, spectra contain information not only from the samples, but also from the spectrophotometer generally invalidating this approach. The use of calibration transfer methods is a promising solution to this problem. In this study, calibration models were developed using interval partial least squares (iPLS), for the estimation of total suspended solids (TSS) and chemical oxygen demand (COD) in sewage from Ultraviolet-visible spectra acquired in a bench scanning spectrophotometer. The feasibility of calibration transfer to a submersible, diode array equipme...Continue Reading

References

Jan 25, 2005·Journal of Pharmaceutical and Biomedical Analysis·Henrik LeionAnders Sparén
Dec 16, 2005·AAPS PharmSciTech·Robert P CogdillJames K Drennen
Jan 13, 2006·Journal of Pharmaceutical and Biomedical Analysis·Eva-Lotta BergmanAnders Sparén
Jun 4, 2008·Water Science and Technology : a Journal of the International Association on Water Pollution Research·Aurélien MaribasBernard Loison
May 30, 2009·Analytical Chemistry·Todd M AlamBruce A Luxon

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Methods Mentioned

BETA
PCA
light scattering

Software Mentioned

PLS
_ Toolbox
iPLS
Matlab

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