Comparison of the absolute calibration method with the method of standard addition for the determination of halothane in blood by gas chromatographic headspace analysis

1988 ◽  
Vol 425 ◽  
pp. 99-105 ◽  
Author(s):  
Pavel Koupil ◽  
Josef Novák ◽  
Josef Drozd
Keyword(s):  
Headspace Analysis ◽  
Standard Addition ◽  
Calibration Method ◽  
Absolute Calibration ◽  
The Absolute

scholarly journals Direct Determination of Molecular Weight and Its Distribution by the Absolute Calibration Method Using the On-Line GPC/NMR

1990 ◽  
Vol 22 (3) ◽  
pp. 218-222 ◽  
Author(s):  
Koichi Hatada ◽  
Koichi Ute ◽  
Masaharu Kashiyama ◽  
Mamoru Imanari
Keyword(s):  
Molecular Weight ◽  
Direct Determination ◽  
Calibration Method ◽  
Absolute Calibration ◽  
On Line ◽  
The Absolute

Headspace Gas Chromatographic Estimation of Some Yogurt Volatiles

1991 ◽  
Vol 74 (4) ◽  
pp. 630-634 ◽  
Author(s):  
Franz Ulberth
Keyword(s):  
Accurate Determination ◽  
Standard Addition ◽  
Calibration Method ◽  
Relative Standard ◽  
Headspace Gas ◽  
Standard Calibration ◽  
Gas Chromatographic Method ◽  
Aroma Components ◽  
Ppm Level

Abstract A headspace gas chromatographic method Is described for the determination of acetaldehyde, ethanol, acetone, dlacetyl, and 2-butanone In yogurt. Yogurt (2 g) is equilibrated 1 h in a 10 mL vial at 60 °C, and 0.25 mL headspace gas Is splitinjected. The volatiles are baseline-separated In less than 5 min by using a thick film capillary column coated with SE-54. An external standard calibration method fulfills the requirements for an accurate determination of the yogurt aroma components. The accuracy of this method was checked by the standard addition method. The precision of the method, In terms of the relative standard deviation, depends on the analyte concentration. At the 10 ppm volatile level, RSD Is 2%, and at the 0.1 ppm level, 15%.

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (1) ◽  
pp. 2249-2273
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The owners calibrations were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determination of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

scholarly journals Intercomparison of erythemal broadband radiometers calibrated by seven UV calibration facilities in Europe and the USA

2008 ◽  
Vol 8 (16) ◽  
pp. 4865-4875 ◽  
Author(s):  
G. Hülsen ◽  
J. Gröbner ◽  
A. Bais ◽  
M. Blumthaler ◽  
P. Disterhoft ◽  
...  
Keyword(s):  
Absolute Calibration ◽  
Angular Response ◽  
The Usa ◽  
Combined Uncertainty ◽  
The Absolute ◽  
Spectral Responses ◽  
Good Agreement

Abstract. A bi-lateral intercomparison of erythemal broadband radiometers was performed between seven UV calibration facilities. The calibrations provided by the instruments owners were compared relative to the characterisation and calibration performed at PMOD/WRC in Davos, Switzerland. The calibration consisted in the determination of the spectral and angular response of the radiometer, followed by an absolute calibration performed outdoors relative to a spectroradiometer which provided the absolute reference. The characterization of the detectors in the respective laboratories are in good agreement: The determinations of the angular responses have deviations below ±4% and the spectral responses agree within ±20%. A "blind" intercomparison of the erythemally weighted irradiances derived by the respective institutes and PMOD/WRC showed consistent measurements to within ±2% for the majority of institutes. One institute showed slightly larger deviation of 10%. The differences found between the different instrument calibrations are all within the combined uncertainty of the calibration.

scholarly journals On the determination of lead in wine by electrothermal atomic absorption spectrometry

2007 ◽  
Vol 5 (3) ◽  
pp. 739-747 ◽  
Author(s):  
Irina Karadjova ◽  
Julijana Cvetković ◽  
Trajče Stafilov ◽  
Sonja Arpadjan
Keyword(s):  
Atomic Absorption ◽  
Zeeman Effect ◽  
Electrothermal Atomic Absorption Spectrometry ◽  
Standard Addition ◽  
Absorption Spectrometry ◽  
Calibration Method ◽  
Relative Standard ◽  
Analytical Procedures ◽  
Pre Treatment

AbstractThe parameters of analytical procedures developed for direct ETAAS determination of Pb in wine are discussed. Atomic absorption spectrometers based on transversal and longitudinal Zeeman effect, wall and integrated platform atomization with two main approaches: (i) measurements in the presence of modifier and (ii) measurements without using any modifier are compared. The optimal temperature programs are defined according to the pre-treatment and atomization curves constructed in the presence of different types of wines. For all investigated instrumental systems, 1:1 dilution of wine sample with 0.2 mol L−1 HNO3 is recommended. Matrix interferences observed, call for standard addition calibration method for Pb quantification in wines. The detection limit (3σ) achieved for wine diluted in the ratio of 1:1 varied from 0.8 to 1.9 μg L−1 depending on the instrument used. The relative standard deviation for the concentration range of 10 to 80 μg L−1 Pb in wine is typically between 4–8%. The accuracy of the analytical procedures recommended was confirmed by comparing the results obtained with those found for wine samples previously digested with HNO3-H2O2 mixture, by added/found method and by parallel analysis using different instruments. A total of 66 wine samples from different regions of Macedonia were analyzed.

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