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Search Publications by: Blaza Toman (Assoc)

Displaying 76 - 86 of 86

New Guidelines for d13C Measurements

April 1, 2006

Author(s)

T Coplen, W A. Brandt, M Gehre, Manfred Groning, HAJ Meijer, Blaza Toman, Jennifer R. Verkouteren

Consistency of 13C measurements can be improved 39-47% by anchoring the 13C scale with two isotopic referencematerials differing substantially in 13C/12C. It isrecommended that 13C values of both organic andinorganic materials be measured and expressed

New Guidelines for delta-13-C Measurements

April 1, 2006

Author(s)

T.B. Coplen, W.A. Brand, M. Gehre, M. Groning, H.A.J. Meijer, Blaza Toman, R. Michael Verkouteren

Consistency of D 13 C Measurements Improved

February 1, 2006

Author(s)

T B. Copelen, W Brand, M Gehre, M Groening, HAJ Meijer, Blaza Toman, R. Michael Verkouteren

We present state-of-the-art measurements and data evaluation methods to show that the consistency of carbon isotope ratio measurements can be improved 39 % to 47 % by anchoring the measurement scale with two isotopic reference materials differing in carbon

Consistency of D 13 C Measurements Improved

February 1, 2006

Author(s)

Blaza Toman, T Coplen, W Brand, R. Michael Verkouteren, M Gehre, M Groening, HAJ Meijer

Linear Models in the Presence of Type B Uncertainty:A Bayesian View of Annex H.3 and H.5 of the Guide to the Expression of Uncertainty in Measurement

February 1, 2006

Author(s)

Blaza Toman

Annex H.3 of the Guide to the Expression of Uncertainty in Measurement presents an example of calibration of a thermometer using a linear regression model. Annex H.5 of the same publication presents a class of statistical models and analysis techniques

Comparison of ISO-GUM, draft GUM Supplement 1, and Bayesian statistics using simple linear calibration

January 1, 2006

Author(s)

Raghu N. Kacker, Blaza Toman, Ding Huang

We compare three approaches for quantifying uncertainty using a measurement equation: the International Organization for Standardization (ISO) Guide to the Expression of Uncertainty in Measurement (GUM), draft GUM Supplement 1, and Bayesian statistics. We

A Bayesian Approach to Assessing Uncertainty and Calculating a Reference Value in Key Comparison Experiments

June 1, 2005

Author(s)

Blaza Toman

Ultrasonic Extraction/Anodic Stripping Voltammetry for Determining Lead in Dust: A Laboratory Evaluation

October 1, 2004

Author(s)

Walter J. Rossiter Jr, Blaza Toman, M E. McKnight, I Emenanjo, M Baghai Anaraki

Previously published laboratory studies have indicated that ultrasonic extraction/anodic stripping voltammetry (UE/ASV) may be suitable for quantitative field analysis of dust wipe samples. Nevertheless, on-site lead extraction and analysis of dust wipes

Ultrasonic Extraction/Anodic Stripping Voltammetry for Determining Lead in Dust: Analyses of Field-Sampled Wipes

October 1, 2004

Author(s)

Walter J. Rossiter Jr, Blaza Toman, M E. McKnight, I Emenanjo

Knowledge of the amount of lead in settled dust is important in clearance examinations, risk assessments, and related activities wherein decisions are made regarding lead hazards in houses and related buildings. At present, analyses of lead in dust are

Factors Affecting Ultrasonic Extraction of Lead from Household Paint Films:Further Investigations

March 1, 2003

Author(s)

Walter J. Rossiter Jr, Blaza Toman, M E. McKnight, I Emenanjo, M Baghai Anaraki

Previous studies at NIST on the use of ultrasonic extraction/anodic stripping voltammetry (UE/ASV) for determining lead in household paint found that the particle size of the ground specimen plays an important role in lead extraction efficiency

Factors Affecting Ultrasonic Extraction of Lead from Laboratory-PreparedHousehold Paint Films

May 1, 2002

Author(s)

Walter J. Rossiter Jr, Blaza Toman, M E. McKnight, M B. Anaraki

A laboratory study was conducted to evaluate the reliability of commercial, field-portable ultrasonic extraction-anodic stripping voltammetry (UE/ASV) for determining the lead levels of laboratory-prepared paint films when tests were performed by certified