Uncertainty estimation in organic elemental analysis using information from proficiency tests

Companyó, R.; Rubio, R.; Sahuquillo, A.; Boqué, R.; Maroto, A.; Riu, J.
December 2008
Analytical & Bioanalytical Chemistry;Dec2008, Vol. 392 Issue 7/8, p1497
Academic Journal
We evaluate the uncertainty in organic elemental analysis of C, H, N, and S. We use data from six proficiency tests (PTs), in which some 35 Spanish laboratories participated. The uncertainty of the technique is estimated from the relative within-laboratory and between-laboratory variances for pure substances and samples with complex matrices (soil, powdered milk, oil, ash, and petroleum coke). We also calculate the relative standard uncertainties for individual laboratories when analysing pure substances using historical data from the participation of each laboratory in different editions of PTs. The uncertainty values obtained for the individual laboratories are comparable with the uncertainty of the technique and correlate with the combined z-scores. The evolution over time of those laboratories participating in common editions of PTs is also evaluated.


Related Articles

  • Effect of ester-additives on the crystallization temperature of methyl hexadecanoate. Nascimento, R.S.V.; Soares, V.L.P.; Albinante, S.; Barreto, L.R. // Journal of Thermal Analysis & Calorimetry;Feb2005, Vol. 79 Issue 2, p249 

    The new compounds [(CH3)2SnAACl]2(AA=glycinate, CH2(NH2)COO-; DL-valinate, (CH3)2CHCH(NH2)COO-) were prepared and characterized by elemental analysis of carbon, hydrogen, nitrogen, chlorine and tin, through their infrared spectra, and by Mössbauer and119mSn-NMR spectroscopic studies,...

  • CHN analysis of functional materials and their precursors. Koshcheeva, O.; Zubareva, A.; Saprykin, A. // Journal of Structural Chemistry;Dec2010 Supplement 1, Vol. 51, p175 

    n optimized and unified technique for CHN analysis of functional materials was suggested to enhance the accuracy of results due to increasing the completeness of sample combustion and improving the resolution of C and N peaks. The obtained contents of carbon, nitrogen and hydrogen agree well...

  • Elemental analysis of aerosol organic nitrates with electron ionization high-resolution mass spectrometry. Rollins, A. W.; Fry, J. L.; Hunter, J. F.; Kroll, J. H.; Worsnop, D. R.; Singaram, S. W.; Cohen, R. C. // Atmospheric Measurement Techniques;2010, Vol. 3 Issue 1, p301 

    The article discusses an elemental analysis of an aerosol organic nitrates through Aerosol Mass Spectrometer (AMS). It cites that the mass spectrum was used to measure the calibration factors for the analysis and to determine the distribution of nitrogen in the noticed fragments. Findings of the...

  • Effect of carbon disulfide and carbonyl sulfide formation on installation efficiency for preparing sulfur by the Claus method. Mukhametova, E.; Kalimeneva, O.; Akimova, M.; Gilyazova, F. // Chemical & Petroleum Engineering;May2013, Vol. 49 Issue 1/2, p25 

    Questions are interpreted connected with conversion of carbon disulfide and carbonyl sulfide in Orenburg Gas Processing Plant installations for preparing sulfur and determination of these components in process gas. Practical data, obtained during monitoring the installation in 2011, are provided.

  • Assessment of Additives for Nitrogen, Carbon, Hydrogen and Sulfur Determination by Organic Elemental Analysis. Marcó, Alejandro; Compañó, Ramon; Rubio, Roser; Casals, Isidre // Microchimica Acta;Jun2003, Vol. 142 Issue 1/2, p13 

    A survey is reported on the use of additives in organic elemental analysis of compounds containing functional groups that may compromise the combustion process. 28 substances containing the following functional groups were selected: organic fluorine, hexafluorophosphate, tetrafluoroborate,...

  • Helium Shortage Opens the Door to Alternatives. Pratap, Amit // Laboratory Equipment;Apr2015, Vol. 52 Issue 12, p28 

    The article discusses the apects of supply shortage and increasing prices of the helium gas which sparked the use of other gases, like hydrogen and nitrogen in research applications, such as chromatography processes. Topics include the factors of supply disruptions of helium gas in the U.S.,...

  • Seasonal and Annual Fluxes of Nutrients and Organic Matter from Large Rivers to the Arctic Ocean and Surrounding Seas. Holmes, Robert; McClelland, James; Peterson, Bruce; Tank, Suzanne; Bulygina, Ekaterina; Eglinton, Timothy; Gordeev, Viacheslav; Gurtovaya, Tatiana; Raymond, Peter; Repeta, Daniel; Staples, Robin; Striegl, Robert; Zhulidov, Alexander; Zimov, Sergey // Estuaries & Coasts;Mar2012, Vol. 35 Issue 2, p369 

    River inputs of nutrients and organic matter impact the biogeochemistry of arctic estuaries and the Arctic Ocean as a whole, yet there is considerable uncertainty about the magnitude of fluvial fluxes at the pan-Arctic scale. Samples from the six largest arctic rivers, with a combined watershed...

  • Parameter-induced uncertainty quantification of soil N2O, NO and CO2 emission from Hölwald spruce forest (Germany) using the LandscapeDNDC model. Rahn, K.-H.; Werner, C.; Kiese, R.; Haas, E.; Butterbach-Bahl, K. // Biogeosciences Discussions;2012, Vol. 9 Issue 4, p5249 

    Assessing the uncertainties of simulation results of ecological models is becoming of increasing importance, specifically if these models are used to estimate greenhouse gas emissions at site to regional/national levels. Four general sources of uncertainty effect the outcome of process-based...

  • The European CO2, CO, CH4 and N2O balance between 2001 and 2005. Luyssaert, S.; Abril, G.; Andres, R.; Bastviken, D.; Bellassen, V.; Bergamaschi, P.; Bousquet, P.; Chevallier, F.; Ciais, P.; Corazza, M.; Dechow, R.; Erb, K. -H.; Etiope, G.; Fortems-Cheiney, A.; Grassi, G.; Hartman, J.; Jung, M.; Lathière, J.; Lohila, A.; Moosdorf, N. // Biogeosciences Discussions;2012, Vol. 9 Issue 2, p2005 

    Globally, terrestrial ecosystems have absorbed about 30% of anthropogenic emissions over the period 2000-2007 and inter-hemispheric gradients indicate that a significant fraction of terrestrial carbon sequestration must be north of the Equator. We present a compilation of the CO2, CO, CH4 and...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics