scholarly journals Speciation and spectrophotometric determination of uranium in seawater

2004 ◽  
Vol 5 (1) ◽  
pp. 55 ◽  
Author(s):  
M. KONSTANTINOU ◽  
I. PASHALIDIS
Keyword(s):  
Ion Exchange ◽  
Oxidation State ◽  
Spectrophotometric Determination ◽  
Uranium Concentration ◽  
Coastal Areas ◽  
Arsenazo Iii ◽  
Predominant Species ◽  
The Mean ◽  
Seawater Samples

A series of ion-exchange and extraction procedures for the separation of uranium from seawater samples and subsequent spectrophotometric determination of uranium in seawater by means of arsenazo(III) is described. According to the measurements performed by means of traced samples at every stage of separation, the yield of the pre-analytical procedures is generally over 90% and the separation of uranium very selective. The mean uranium concentration in seawater samples collected from five different coastal areas in Cyprus was found to be 3.2 ± 0.2 & micro; g L-1. Uranium in seawater is stable in its hexavalent oxidation state and UO2 (CO3)34- is the predominant species under normal coastal conditions (pH ≥ 8, EH ≥ 0.35 mV, 1 atm and 0.03% CO2).

Fluorometric and Spectrophotometric Determination of Pirbuterol Hydrochloride in Authentic and Dosage Forms

1985 ◽  
Vol 68 (6) ◽  
pp. 1222-1225
Author(s):  
Mohamed E Mohamed ◽  
Hassan Y Aboul-Enein
Keyword(s):  
Potentiometric Titration ◽  
Alkaline Medium ◽  
Spectrophotometric Determination ◽  
Fluorescence Intensity ◽  
Perchloric Acid ◽  
Authentic Sample ◽  
Dosage Forms ◽  
Fluorometric Method ◽  
The Mean

Abstract Pirbuterol hydrochloride has been assayed in alkaline medium by using a fluorometric method to measure fluorescence intensity at 372 nm with excitation at 310 nm and by the ▵A method at 242 nm.The linearity ranges are 0.5-4 μg/mL and 10-50 μg/mL, respectively. An authentic pirbuterol HC1 sample was analyzed by nonaqueous potentiometric titration using 0.1N perchloric acid, and the results were compared with those for fluorometric and AA methods. The mean percent recoveries for the authentic sample were 98.72 ± 1.13 and 99.24 ± 0.85, respectively. When applied to commercial capsules containing 10 mg and 15 mg each, the fluorometric method gave mean percent recoveries of 101.11 ± 1.05 and 98.12 ± 0.93; the ▵A method gave mean percent recoveries of 100.57 ± 0.83 and 97.80 ± 0.75, respectively.

scholarly journals 8-Quinolinol extraction and spectrophotometric determination of uranium with Arsenazo III.

1969 ◽  
Vol 18 (2) ◽  
pp. 208-213 ◽  
Author(s):  
Kenji MOTOJIMA ◽  
Tadashi YAMAMOTO ◽  
Yoshiharu KATO
Keyword(s):  
Spectrophotometric Determination ◽  
Arsenazo Iii

Ion Exchange Separations and Atomic Absorption Determination of Trace Metals in Ores after Basic Fusion

1972 ◽  
Vol 26 (2) ◽  
pp. 302-305 ◽  
Author(s):  
T. W. Freudiger ◽  
C. T. Kenner
Keyword(s):  
Standard Deviation ◽  
Ion Exchange ◽  
Metal Ions ◽  
Atomic Absorption ◽  
Strong Acid ◽  
Ion Exchange Resin ◽  
High Concentration ◽  
The Mean ◽  
Trace Constituents

The determination of trace constituents in ores by atomic absorption after basic fusion and solution in strong acid is erratic due to the light scattering and aspirator clogging of the high concentration of sodium salts. The sodium is separated from the trace constituents using a column procedure and an iminodiacetate chelating ion exchange resin which will retain di- and trivalent metal ions at pH values above 6.0 but will not retain alkali metal ions. The trace constituents are determined by atomic absorption after elution with HCl. The precision (standard deviation of the mean) of the atomic absorption method is increased at least fivefold by the resin separation and the method is applicable to concentrations in the low ppm range. The standard deviation of the mean for an NBS sample containing 0.007% Cu is 0.0004%.

Flow-injection spectrophotometric determination of yttrium with Arsenazo III

1999 ◽  
Vol 11 (5) ◽  
pp. 279-283 ◽  
Author(s):  
Kate Grudpan ◽  
Wiboon Praditweangkum ◽  
Ponlayuth Sooksamiti ◽  
Robert Edwards
Keyword(s):  
Spectrophotometric Determination ◽  
Flow Injection ◽  
Arsenazo Iii
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