Calibration uncertainty

Heydorn, Κ.; Anglov, Thomas

doi:10.1007/s00769-002-0440-8

Cited by 26 publications

(6 citation statements)

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“…24,25 The BTEX concentrations determined with the Chrompack CP 7001 monitor were plotted versus those determined with each type of passive sampler. The results are presented in Figures 3 and 4.…”

Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Performance of Passive Samplers

Zabiegała

Sârbu

Urbanowicz

et al. 2011

Journal of the Air & Waste Management Association

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Atmospheric concentrations of benzene, toluene, ethylbenzene, and xylenes (o-xylene and m,p-xylene) were assessed in the Tricity area (Gdań sk-Sopot-Gdynia, Poland) with the use of two types of passive samplers: permeation (homemade passive samplers) and diffusive (Radiello and Orsa 5). Samples were collected during 2008 at selected sites in the Tricity area at monitoring stations belonging to the agency of Regional Air Quality Monitoring Foundation. The field study was conducted to compare the performance of these two different types of passive samplers. A statistical approach was formulated, and the experimental data were evaluated using the paired t test, Wilcoxon signed rank-sum test, and Friedman analysis of variance. All the statistical results confirm the hypothesis that the differences between the performances of the three sampling devices are highly significant. Despite the fact that data obtained with the homemade passive sampler indicated that the results were higher compared with those for the Radiello and Orsa 5 diffusive samplers, the authors note that all differences between the homemade permeation sampler and the Radiello and Orsa 5 diffusive samplers are positive. INTRODUCTIONThe elevated levels of volatile organic compounds (VOCs) in the air over many conurbations have spawned numerous attempts on various scales to clean up the air. Air quality management systems have been set up to supply information on concentration levels of selected atmospheric pollutants. Levels of analytes detected in samples collected at particular places and times are increasingly being used in models for predicting the spread of pollutants and in compiling distribution maps of pollutant levels. For the persons responsible for environment quality control, the biggest problem is choosing the proper field sampling technique, which should have the following features: detection of an appropriate concentration range of target analytes, known accuracy and precision of measurements, clearly defined influence of interferents on measurement results, simplicity and rapidity of measurement, and low running costs.Passive sampling is currently one of main areas of development in analysis, particularly in the monitoring of environmental pollutants. The main advantage of passive sample collection/enrichment technology is that in situ sample collection is very simple, which is particularly important in the case of long-term measurements and is also the reason that passive sampling appears to be an interesting alternative to the routinely used dynamic methods. Passive air sampling can provide atmospheric concentrations of pollutants over a period of months and simultaneously at a number of sites at low cost. With this method, pollutant concentrations are integrated over the whole exposure time, making them immune to accidental, extreme variations. Passive sampling can be used to investigate the atmospheric concentration of organic pollutants not only at the local scale 1,2 but also at the continental and global scales. 3 Inform...

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Section: Resultsmentioning

confidence: 99%

A Comparative Study of the Performance of Passive Samplers

Zabiegała

Sârbu

Urbanowicz

et al. 2011

Journal of the Air & Waste Management Association

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“…In a supervised experiment [4], analytical results obtained by 10 independent operators, each using their own calibration data, were found to be in complete statistical control -but only because the predicted uncertainty was based on a properly verified uncertainty budget. There was no need -as suggested by Andersen -to correct the predicted uncertainty by an arbitrary factor of √2!…”

Section: Comments On the Concept Of Precisionmentioning

confidence: 99%

On the development of quality assurance in analytical chemistry

Heydorn¹

2015

TrAC Trends in Analytical Chemistry

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“…Unfortunately, very few standard solutions are available on the market up to now, and not one of those is certified, making the selection of the calibrant solution a very critical step in the determination of SCCPs. It has been already demonstrated that grossly biased results can result from improper calibration, 30 undermining the accuracy of the measurement. 31 Often, the uncertainty of the calibration step is the largest contribution to the combined uncertainty of the analytical result.…”

Section: Quantificationmentioning

confidence: 99%

Analysis of short-chain chlorinated paraffins: a discussion paper

et al. 2007

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Short-chain chlorinated paraffins are a class of organic compounds widely used in many industrial applications, extensively diffused into the environment, persistent, bioaccumulative, and toxic towards aquatic organisms. However, their study and monitoring in the environment are still limited. Because of the enormous number of positional isomers that characterise their mixtures, the analysis of this class of pollutants is very difficult to perform. Beside this, the lack of certified reference materials poses a problem for the assessment of the quality assurance/quality control of any analytical procedure. At present, the scientific community does not agree on any analytical reference method, although the monitoring of short-chain chlorinated paraffins has already started in order to comply with the Water Framework Directive of the European Union on water quality. In this paper the regulatory framework, in which chlorinated paraffins are included, and the status concerning their determination are summarized. The main analytical difficulties still existing are discussed, and the definition of a method-defined parameter as well as the development of a standardised method are suggested as a way to obtain comparable monitoring data.

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Calibration uncertainty

Cited by 26 publications

References 0 publications

A Comparative Study of the Performance of Passive Samplers

A Comparative Study of the Performance of Passive Samplers

On the development of quality assurance in analytical chemistry

Analysis of short-chain chlorinated paraffins: a discussion paper

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