Publications by authors named "Sam A Margolis"

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Lessons from the NIST micronutrients quality assurance program for vitamin C, 1993 to 2015: sample stability, assay reproducibility, and use of controls to improve comparability.
David L Duewer, Jeanice Brown Thomas, Katherine E Sharpless, Sam A Margolis

Anal Bioanal Chem· January 2021

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Measurement of water by oven evaporation using a novel oven design. 2. Water in motor oils and motor oil additives.
Sam A Margolis, Kevin Vaishnav, John R Sieber

Anal Bioanal Chem· November 2004

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Measurement of water by oven evaporation using a novel oven design. 1. Water in water-saturated 1-octanol, coal, cement, and refined oils.
Sam A Margolis, Kevin Vaishnav, John R Sieber

Anal Bioanal Chem· October 2004

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Solid-phase extraction-electrospray ionization mass spectrometry for the quantification of folate in human plasma or serum.
Bryant C Nelson, Christine M Pfeiffer, Sam A Margolis, Chad P Nelson

Anal Biochem· February 2004

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The determination of water in crude oil and transformer oil reference materials.
Sam A Margolis, Charles Hagwood

Anal Bioanal Chem· May 2003

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Certification of standard reference material 970, ascorbic acid in serum, and analysis of associated interlaboratory bias in the measurement process.
Sam A Margolis, Mark Vangel, David L Duewer

Clin Chem· March 2003

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Affinity extraction combined with stable isotope dilution LC/MS for the determination of 5-methyltetrahydrofolate in human plasma.
Bryant C Nelson, Christine M Pfeiffer, Sam A Margolis, Chad P Nelson

Anal Biochem· February 2003

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A coulometric method for determining substances that interfere with the measurement of water in oils and other chemicals by the Karl Fischer method.
Sam A Margolis, Jeffery Paulsen, Edward Park

Anal Bioanal Chem· December 2002

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Interlaboratory assessment of measurement precision and bias in the coulometric Karl Fischer determination of water.
Sam A Margolis, Jacob B Angelo

Anal Bioanal Chem· October 2002

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