A Rapid Method for the Determination of Chlorine, Phosphorus, and Sulfur in Flours of Grains and Legumes Using Wavelength Dispersive X-Ray Flourescence Spectrometry

Abstract A rapid method for the determination of chlorine, phosphorus, and sulfur In commercial flours of wheat, barley, maize, rice, field bean, and soybean by wavelength dispersive x-ray fluorescence spectrometry has been developed. The flours are strained through a 425 μm sieve, then pelletized and measured. The total analysis time for the quantitation of chlorine, phosphorus, and sulfur is less than 20 min per sample. Calibration is carried out using a standard additions method with mixed standards. The method is accurate and precise, and appears to be adequate for routine analyses.

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Ascorbic and dehydroascorbic acids measured in plasma preserved with dithiothreitol or metaphosphoric acid

Clinical Chemistry ◽

10.1093/clinchem/36.10.1750 ◽

1990 ◽

Vol 36 (10) ◽

pp. 1750-1755 ◽

Cited By ~ 42

Author(s):

S A Margolis ◽

R C Paule ◽

R G Ziegler

Keyword(s):

Ascorbic Acid ◽

Reference Material ◽

Rapid Method ◽

Dehydroascorbic Acid ◽

Analysis Time ◽

Plasma Samples ◽

Metaphosphoric Acid ◽

Total Analysis Time ◽

Total Analysis ◽

The Stability

Abstract We describe a rapid method for accurately and precisely measuring ascorbic acid and dehydroascorbic acid in plasma. Total analysis time is less than 10 min, replicate analyses of a single pool provide precision less than or equal to 2%, and values measured in supplemented samples agree with known concentrations of 4.68 and 11.83 mg/L. The stability and homogeneity of lyophilized plasma samples supplemented with ascorbic acid and dithiothreitol are documented. We also describe a procedure in which metaphosphoric acid (50 g/L) is used to prepare a reference material for the measurement of ascorbic acid and dehydroascorbic acid. The procedure for both acids consists of first measuring the native ascorbic acid, then reducing the dehydroascorbic acid, at neutral pH, with dithiothreitol, and finally measuring the total ascorbic acid; dehydroascorbic acid is then determined by difference. The metaphosphoric-acid-treated samples were stable at -70 degrees C, but stability decreased with temperature over the range examined, 4-50 degrees C.

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Simultaneous Determination of 36 Elements by X-Ray Fluorescence Spectrometry as a Prospecting Tool

Advances in X-ray Analysis ◽

10.1154/s0376030800012829 ◽

1982 ◽

Vol 26 ◽

pp. 443-450

Author(s):

Clive E. Feather ◽

Fritz C. Baumgartner

Keyword(s):

Simultaneous Determination ◽

Spectral Lines ◽

Analysis Time ◽

Fluorescence Spectrometry ◽

X Ray ◽

Geochemical Prospecting ◽

Dispersive Channels ◽

Ore Mineralization ◽

Practical Limit

In regional reconnaisance geochemical prospecting, it is desirable to determine as many elements as possible, in order to provide a comprehensive cover for the detection of most types of ore mineralization. Multi-element simultaneous instruments are ideally suited to this task, but the maximum number of wavelength dispersive channels (monochromators) which may be fitted to any one of the commercially available X-ray spectrometers is approximately thirty. Because some of these channels are required for the measurement of background, the practical limit for spectral lines is about twenty-five. Additional elements may be determined by inclusion of a scanning channel, but its sequential operation increases the analysis time per sample.

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A simple and rapid method for simultaneous pre-concentration of eight trace-heavy-metals in water using 1-(2-pyridylazo)-2-naphthol and yttrium for X-ray fluorescence spectrometry

Analytical Methods ◽

10.1039/c5ay00657k ◽

2015 ◽

Vol 7 (16) ◽

pp. 6545-6551 ◽

Cited By ~ 4

Author(s):

Shigeru Taguchi ◽

Miyabi Asaoka ◽

Eiko Hirokami ◽

Noriko Hata ◽

Hideki Kuramitz ◽

...

Keyword(s):

Heavy Metals ◽

Simultaneous Determination ◽

Rapid Method ◽

Energy Dispersive ◽

Fluorescence Spectrometry ◽

X Ray ◽

Trace Heavy Metals ◽

Concentration Technique

A simple and rapid pre-concentration technique for the simultaneous determination of eight trace heavy metals in water by energy-dispersive X-ray fluorescence spectrometry.

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Determination of 90Sr in preparedness: Optimization of total analysis time for multiple samples

Journal of Radioanalytical and Nuclear Chemistry ◽

10.1007/s10967-008-0512-2 ◽

2008 ◽

Vol 276 (2) ◽

pp. 357-362 ◽

Cited By ~ 11

Author(s):

A. Tovedal ◽

U. Nygren ◽

H. Ramebäck

Keyword(s):

Analysis Time ◽

Total Analysis Time ◽

Total Analysis ◽

Multiple Samples

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Analysis of Selected Elements in Tobacco by Wavelength Dispersive X-Ray Fluorescence Spectrometry

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/71.5.1038 ◽

1988 ◽

Vol 71 (5) ◽

pp. 1038-1041

Author(s):

John M Martin

Keyword(s):

Sample Preparation ◽

Rapid Method ◽

Fluorescence Spectrometry ◽

Report Generation ◽

X Ray ◽

Computer Disk

Abstract A rapid method for the determination of 16 elements in tobacco by wavelength dispersive X-ray fluorescence spectrometry has been developed. The method is accurate and precise, and requires only 9 min per sample for quantitation. Sample preparation consists of placing a portion of dried, ground tobacco in a sample cup, and pressing at 25 tons pressure to make a compressed pellet. This pellet is then automatically analyzed by X-ray fluorescence for 16 elements. The results are stored on a computer disk for future recall and report generation.

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Rapid Method for the Quantitative Measurement of Numerous Pharmaceutically Important Amines

Journal of AOAC INTERNATIONAL ◽

10.1093/jaoac/55.4.789 ◽

1972 ◽

Vol 55 (4) ◽

pp. 789-793

Author(s):

W Richard Matthew ◽

Howard C Browne ◽

J Bex Weber

Keyword(s):

Rapid Method ◽

Aromatic Amines ◽

Quantitative Measurement ◽

Bromothymol Blue ◽

Pharmaceutical Products ◽

Analysis Time ◽

Routine Analysis ◽

Total Analysis Time ◽

Total Analysis

Abstract A simplified variation of the bromothymol blue method has been used successfully to analyze numerous pharmaceutically important amines. A single benzene extraction of the yellow amine-dye complex is made possible by buffering the dye solution at pH 7.0 and by maintaining the organic-to-aqueous ratio at not less than 3:1. This procedure not only greatly reduces the analysis time but also makes possible the analysis of numerous aromatic amines by a simple single extractiondye method. Any variation in t h e solubility of the amine-dye complex is compensated for by the simultaneous determ ination of a known standard of equal volume. Total analysis time for a dissolved sample does not exceed 15 min. These factors make the method especially useful for the routine analysis of pharmaceutical products.

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Gas-Chromatographic Determination of Ethylene Glycol in Serum

Clinical Chemistry ◽

10.1093/clinchem/20.7.820 ◽

1974 ◽

Vol 20 (7) ◽

pp. 820-824 ◽

Cited By ~ 14

Author(s):

R L Peterson ◽

D O Rodgerson

Keyword(s):

Gas Chromatography ◽

Ethylene Glycol ◽

Chromatographic Determination ◽

Analysis Time ◽

Total Analysis Time ◽

Total Analysis

Abstract We have developed a method for detection and quantitation of ethylene glycol in serum, based on the gas chromatography of its dibenzoate ester. No special reagents or equipment are required. The method is virtually free of interference and sensitive to less than 0.02 mg of ethylene glycol per milliliter. The total analysis time is about 90 min.

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