A combined spectrophotometric-fluorimetric method for the determination of aluminum in, products from wet-process phosphoric acid manufacture

1965 ◽  
Author(s):  
D J Barkley
Keyword(s):  
Phosphoric Acid ◽  
Fluorimetric Method ◽  
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

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.

scholarly journals DETERMINATION OF SULFATE IN THE WET-PROCESS OF PHOSPHORIC ACID BY REVERSE FLOW INJECTION

Química Nova ◽  
2014 ◽  
Author(s):  
Wenhui Shi ◽  
Lin Yang ◽  
Quanjun Fu ◽  
Zhiye Zhang ◽  
Xinlong Wang
Keyword(s):  
Phosphoric Acid ◽  
Flow Injection ◽  
Reverse Flow ◽  
Wet Process ◽  
Reverse Flow Injection

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

Spectrophotometric Determination of Calcium in Wet-Process Phosphoric Acid.

1962 ◽  
Vol 34 (3) ◽  
pp. 440-441 ◽  
Author(s):  
D. K. Banerjee ◽  
C. C. Budke ◽  
F. D. Miller
Keyword(s):  
Phosphoric Acid ◽  
Spectrophotometric Determination ◽  
Wet Process

EINE CHEMISCHE METHODE ZUR BESTIMMUNG VON 16-EPI-ÖSTRIOL IM URIN DES MENSCHEN

1963 ◽  
Vol 44 (1) ◽  
pp. 47-66 ◽  
Author(s):  
W. Nocke ◽  
H. Breuer
Keyword(s):  
Melting Point ◽  
Phosphoric Acid ◽  
Aqueous Alkali ◽  
Percentage Error ◽  
Organic Layer ◽  
Maximum Percentage ◽  
Chemical Determination ◽  
Routine Assay ◽  
Hydrolysis Of

ABSTRACT A method for the chemical determination of 16-epi-oestriol in the urine of nonpregnant women with a qualitative sensitivity of less than 0.5 μg/24 h is described. The separation of 16-epi-oestriol and oestriol is accomplished by converting 16-epi-oestriol into its acetonide, a reaction which is stereoselective for cis-glycols and therefore not undergone by oestriol as a trans-glycol. Following partition between chloroform and aqueous alkali, the acetonide of 16-epi-oestriol is completely separated with the organic layer whereas oestriol as a strong phenol remains in the alkaline phase. 16-epi-oestriol is chromatographed on alumina as the acetonide and determined as a Kober chromogen. This procedure can easily be incorporated into the method of Brown et al. (1957 b) thus making possible the simultaneous routine assay of oestradiol-17β, oestrone, oestriol and 16-epi-oestriol from one sample of urine. The specificity of the method was established by separation of 16-epi-oestriol from nonpregnancy urine as the acetonide, hydrolysis of the acetonide by phosphoric acid, isolation of the free compound by microsublimation and identification by micro melting point, colour reactions and chromatography. The accuracy of the method is given by a mean recovery of 64% for pure crystalline 16-epi-oestriol when added to hydrolysed urine in 5–10 μg amounts. The precision is given by s = 0.24 μg/24 h. For the duplicate determination of 16-epi-oestriol the qualitative sensitivity is 0.44 μg/24 h, the maximum percentage error being ± 100% The quantitative sensitivity (±25% error) is 1.7 μg/24 h.

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