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.

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.

Argon Plasma Emission Spectrometry of Uranium in Phosphatic Materials

1983 ◽  
Vol 66 (4) ◽  
pp. 949-951
Author(s):  
J D Norman ◽  
Louis A Stumpe ◽  
Joe R Trimm ◽  
Frank J Johnson
Keyword(s):  
Argon Plasma ◽  
Sample Pretreatment ◽  
Trioctylphosphine Oxide ◽  
Emission Spectrometry ◽  
Plasma Emission ◽  
Plasma Emission Spectrometry ◽  
Hydrochloric Acid Solutions ◽  
System 2 ◽  
Back Extract

Abstract A method is described for the determination of uranium by using a dc argon plasma emission spectrometer. Problems and interferences found in the method previously reported are overcome by using an improved sample pretreatment. A new synergistic system, 2% oxalic acid adjusted to pH 4.5 with triethanolamine, is used to quantitatively back-extract uranium from trioctylphosphine oxide in cyclohexane. This improved method yields excellent results for >1 ppm uranium in nitric and hydrochloric acid solutions of phosphate rocks, phosphoric acids, phosphate fertilizers, phosphogypsums, organic phosphates, and waste solutions. Recovery data are given for synthetic and certified standards.

Sign in / Sign up

Export Citation Format

Share Document