Rapid Determination of Sulfate Content of Wet-Process Phosphoric Acid by Phototurbidimetric Titration

1966 ◽  
Vol 14 (5) ◽  
pp. 521-522 ◽  
Author(s):  
P. C. Pile ◽  
A. Williams
Keyword(s):  
Phosphoric Acid ◽  
Rapid Determination ◽  
Sulfate Content ◽  
Wet Process

Flame Photometric Determination of Calcium in Wet-Process Phosphoric Acid

1954 ◽  
Vol 26 (6) ◽  
pp. 1060-1061 ◽  
Author(s):  
J. A. Brabson ◽  
W. D. Wilhide
Keyword(s):  
Phosphoric Acid ◽  
Photometric Determination ◽  
Wet Process

scholarly journals Rapid Determination of Nosiheptide in Meat and Egg by Liquid Chromatography with Fluorescence Detection

2000 ◽  
Vol 83 (1) ◽  
pp. 17-19 ◽  
Author(s):  
Shozo Horii ◽  
Naoto Oku
Keyword(s):  
Liquid Chromatography ◽  
Phosphoric Acid ◽  
Fluorescence Detection ◽  
Mobile Phase ◽  
Lower Layer ◽  
Rapid Determination ◽  
Chicken Muscle

Abstract A procedure was developed to determine nosiheptide residues in marketed meat and egg. Acetonitrile was used for the extraction, and the extract was partitioned with hexane to remove fat. The lower layer was reconstructed and quantitated by liquid chromatography using fluorescence detection at 357 nm excitation and 500 nm emission. The mobile phase consisted of 0.025% phosphoric acid–acetonitrile (50 + 50, v/v). Recoveries of nosiheptide from fortified samples ranged from 91.3 to 95.2% for swine muscle, 88.6 to 92.7% for chicken muscle, and 86.3 to 86.8% for egg. The method was used to monitor swine and chicken muscle and egg (20 samples each) in the market. Nosiheptide was not determined in all 60 samples.

Simultaneous Determination of Aluminum, Iron, Calcium, and Magnesium in Wet-Process Phosphoric Acid by DC Argon Plasma Emission Spectrometry

1981 ◽  
Vol 64 (1) ◽  
pp. 25-27 ◽  
Author(s):  
G Bradley Hunter ◽  
Terry C Woodis ◽  
Frank J Johnson
Keyword(s):  
Phosphoric Acid ◽  
Simultaneous Determination ◽  
Argon Plasma ◽  
Absorption Spectrometry ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Wet Process ◽  
Plasma Emission Spectrometry ◽  
Significant Difference

Abstract A method has been developed for the simultaneous determination of Al, Fe, Ca, and Mg in wet-process phosphoric acid by dc argon plasma emission spectrometry. The suppression of Ca and Mg emission by phosphate encountered in flame analyses was nonexistent, and other interferences were minimal. Results obtained by the procedure were compared with those obtained by atomic absorption spectrometry. The paired t-test showed no significant difference between the 2 methods at the 95% confidence level.

Application of an Automated Coulometric Titrator to the Determination of Water in Phosphoric Acids

1969 ◽  
Vol 52 (3) ◽  
pp. 569-577
Author(s):  
Donald E Jordan ◽  
Jack L Hoyt
Keyword(s):  
Phosphoric Acid ◽  
Karl Fischer ◽  
Wet Process ◽  
End Point ◽  
Base Solution ◽  
End Point Detection ◽  
Point Detection ◽  
Careful Check

Abstract In the described method, water in phosphoric acid is determined by in situ coulometric generation of Karl Fischer reagent with automated end point detection. The variables associated with visual end point detection among different operators are eliminated. Sample size is limited by the generation rate of available coulometers and is 50 mg for samples containing more than 20% water and 100 t o 150 m g for samples containing less than 20% water for a 20 min analysis time . The precision at 99% confidence ranges from 0.43 ± 0.05% for superphosphoric acid to 36.8 ± 0.81% for untreated 10–34–0 base solution; for polished wet process phosphoric acid the precision is 16.49 ± 0.19% compared to 16.70 ± 0.64% by azeotropie distillation. The method is applicable in all systems which do not normally interfere with Karl Fischer reagent; the generating efficiency at the 100% water level is >99%. Coulometer power tube fatigue is the most serious limitation unless a careful check and replacement program is initiated.

Determination of Uranium in Phosphate Rock and Wet-Process Phosphoric Acid by Argon Plasma Emission Spectrometry

1980 ◽  
Vol 63 (2) ◽  
pp. 208-210
Author(s):  
Terry C Woodis ◽  
J R Trimm ◽  
John H Holmes ◽  
Frank J Johnson
Keyword(s):  
Standard Deviation ◽  
Phosphoric Acid ◽  
Phosphate Rock ◽  
Argon Plasma ◽  
Trioctylphosphine Oxide ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Wet Process ◽  
Plasma Emission Spectrometry

Abstract A method for determining uranium, based on extraction with trioctylphosphine oxide and measurement by argon plasma emission spectrometry at 424.17 nm, is described. Results from the argon plasma method compare favorably with results from other methods and are within 1 standard deviation of the composite average of all methods used in an 11-laboratory study.

Flame Photometric Determination of Calcium in Wet-Process Phosphoric Acid

1954 ◽  
Vol 26 (10) ◽  
pp. 1663-1663 ◽  
Author(s):  
J A. Brabson ◽  
W D. Wilhide
Keyword(s):  
Phosphoric Acid ◽  
Photometric Determination ◽  
Wet Process
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