A multivariate calibration procedure for UV/VIS spectrometric quantification of organic matter and nitrate in wastewater

Langergraber, Günter; Fleischmann, N.; Hofstädter, Franz

doi:10.2166/wst.2003.0086

Cited by 157 publications

(138 citation statements)

References 2 publications

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“…This instrument is a portable ultraviolet-visible spectrometer that measures light attenuation between 200 nm and 750 nm at 3-nm intervals and is designed for unattended use in natural and industrial environments (Langergraber et al 2003). The spectrolyser uses two beams from a Xenon lamp, one passing through the sample and one as a reference.…”

Section: Methodsmentioning

confidence: 99%

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Bass

Bird

Liddell

et al. 2011

Limnology & Oceanography

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In small catchments with rapid flood pulses, detailed temporal data are essential because high-discharge events can be measured in hours and days, rather than weeks and months. Using high-resolution (15 min) sampling, we studied the dynamics of aquatic dissolved and particulate organic carbon (DOC and POC) export through episodic discharge events in a small pristine rainforest catchment in northeast Australia between November 2009 and March 2010. High temporal resolution using this instrumentation requires extensive calibration with concurrent field sampling. The concentration of DOC and POC peaked during times of high stream discharge, reflecting an increased mobilization of soil-water carbon stocks. DOC was the major form of organic carbon in the stream (, 70% of the total carbon export). The majority of total organic carbon exported from the catchment (84%) occurred during significant discharge events (discharge . 50 L s 21 ), which occurred only 9% of the time. Export of DOC and POC totaled 195 and 68 kg km 22 month 21 , respectively, with a DOC : POC ratio of 2.9 6 0.9. If this subcatchment was sampled at weekly intervals the lateral export of carbon would have been underestimated by between 49% and 78% for DOC and POC, respectively. Preliminary d 13 C and molar C : N values of the dissolved and particulate matter suggest that during discharge events, less microbially processed material from the upper soil layers dominated organic matter export, with the opposite being true in nonflood conditions. Not only will the quantities of organic matter exported change in different discharge conditions, but the source and quality may also shift. This study reveals that a field-portable instrument for DOC and POC quantification can yield robust, high-temporal-resolution carbon budget estimates, though detailed, site-specific calibration is essential.

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Section: Methodsmentioning

confidence: 99%

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Bass

Bird

Liddell

et al. 2011

Limnology & Oceanography

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“…6 Acceptability criteria shall be established for calibration purposes. A simple criterion, for laboratory linear instruments, is the correlation coefficient of the regression model.…”

Section: Calibration and Verification Procedures 31 A Unified Calibrmentioning

confidence: 99%

“…The method and procedure used in the global calibration is presented by Langergraber et al [6]. Fig.…”

Section: Global Calibration Of Spectro::lyser Spectrophotometermentioning

confidence: 99%

A unified protocol for sensor calibration and verification in applications of WWTPs and sewer systems monitoring

Xin¹,

Bertrand-Krajewski²

2012

Water Pollution XI

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PREPARED, Enabling Change, is an EU-funded Collaborative Project under the Seventh Framework Programme (FP7). The project aims to gather urban utilities in Europe and worldwide to develop an advanced strategy in meeting the upcoming challenges for water supply and wastewater treatment brought by climate change. This work aims to increase technological capacity and improve performance of traditional water supply and wastewater treatment systems via better use of sensors. For newly developed multivariate sensors, calibration procedures are quite different from manufacturer to manufacturer. Manual operation during calibration and verification is commonly practised in this field due to complexity of the calibration procedure and occurrence of unpredictable events. In addition, many of the sensor manufacturers have not developed detailed instructions for sensor calibration. Therefore, a calibration and verification protocol is needed to guide and unify practice in this area where diversified practice is commonly observed. In this work, a unified protocol for sensor calibration and verification was developed and applied. Two sensor products, an optical sensor and an electronic nose sensor, are discussed as examples for calibration procedures, regression methods and verification methods of calibration in the application of wastewater treatment plant monitoring.

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“…By recording the light absorption in a sample between 200-400nm, the probe is capable of determining more than simply a fingerprint spectrum; besides this fingerprint, the values for a number of specific parameters are calculated from the data contained in the fingerprint, using algorithms provided by S::can [8,9].…”

Section: Figurementioning

confidence: 99%

An early warning monitoring system for quality control in a water distribution network

Guercio¹,

Ruzza²

2007

WIT Transactions on Ecology and the Environment, Vol 103

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The goal of an early warning water monitoring system (EWWMS) for quality control in a water distribution network is to identify low probability/high impact contamination events in source water or distribution systems. It should be able to detect not only intentional contamination, but also contaminants introduced accidentally or natural occurrences. Firstly, to ensure the full protection of drinking water, a technology-based EWWMS should be one component of the program. While laboratory technology exists to measure a wide range of contaminants, it's not the same for on-line and real time technology. A number of research projects are investigating rapid and on-line monitoring technologies, including biosensors and biochips, fiber optics and microelectronics. In most cases the performances of these systems has not been fully characterized. In this paper, a submergible UV/VIS spectrometer has been extensively tested in laboratory experiments, with the aim to check its limits of sensitivity, its ability to identify and quantify specific contaminants and its rate of false positive/negative.

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A multivariate calibration procedure for UV/VIS spectrometric quantification of organic matter and nitrate in wastewater

Cited by 157 publications

References 2 publications

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

Fluvial dynamics of dissolved and particulate organic carbon during periodic discharge events in a steep tropical rainforest catchment

A unified protocol for sensor calibration and verification in applications of WWTPs and sewer systems monitoring

An early warning monitoring system for quality control in a water distribution network

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