Ultraviolet Spectrophotometric Determination of Niobium in Hydrochloric Acid

1953 ◽  
Vol 25 (12) ◽  
pp. 1807-1809 ◽  
Author(s):  
J. H. Kanzelmeyer ◽  
Harry Freund
Keyword(s):  
Hydrochloric Acid ◽  
Spectrophotometric Determination

Spectrophotometric Determination of Lanthanum in Raffinate with Tribromoarsenazo

2014 ◽  
Vol 675-677 ◽  
pp. 1429-1432
Author(s):  
Xing Xin Chen ◽  
Kui Liu ◽  
Li Fang Kuang ◽  
Hua Long
Keyword(s):  
Ascorbic Acid ◽  
Hydrochloric Acid ◽  
Correlation Coefficient ◽  
Wavelength Range ◽  
Spectrophotometric Determination ◽  
Linear Relation ◽  
Acidic Environment ◽  
Beer's Law ◽  
Beer’S Law

Determination of lanthanum in the raffinate by spectrophotometry was studied, using tribromoarsenazo as chromogenic reagent. The addition of ascorbic acid can mask the interference of other metal cations in the solution. Under the conditions of ascorbic acid (10g·L-1) 5 mL, hydrochloric acid 0.04 mol·L-1 and tribromoarsenazo (0.5g·L-1) 2 mL, Beer’s law is obeyed in the range of 0-10 μg·(25mL)-1 for lanthanum, with correlation coefficient higher than 0.99. Beer’s law can be applicable for the wavelength range of 580-660 nm. There is no linear relation at too high or too low acidic environment.

Selective determination of tantalum in ores by extraction with N-phenylbenzohydroxamic acid in toluene

1990 ◽  
Vol 55 (7) ◽  
pp. 1686-1690 ◽  
Author(s):  
José Aznarez ◽  
Juan Carlos Vidal ◽  
Cecilia Vaquero
Keyword(s):  
Hydrochloric Acid ◽  
Acid Solution ◽  
Aqueous Phase ◽  
Spectrophotometric Determination ◽  
Absorption Maximum ◽  
Good Accuracy ◽  
Molar Absorptivity ◽  
Selective Determination ◽  
Accuracy And Precision

A method for tantalum(V) spectrophotometric determination in a non-aqueous phase is proposed. Tantalum(V) is extracted with N-phenylbenzohydroxamic acid into toluene from a 5M hydrochloric acid solution. The colour is then developed by addition of 4-(2-pyridylazo)-resorcinol (PAR) solution in N,N-dimethylformamide and pyridine to an aliquot of the extracted phase. The Ta(V)-PAR complex gives an absorption maximum at 547 nm with a molar absorptivity of 3.88 ± 0.04 . 104 l mol-1 cm-1. The method has been applied to the selective determination of tantalum in ores with good accuracy and precision.

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