scholarly journals Development of an Ultraviolet-Spectrophotometric Method for Analysis of Esterquat-Containing Flotation Collectors in Aqueous Solutions

2018 ◽  
Vol 21 (5) ◽  
pp. 757-763
Author(s):  
Olga Ibragimova ◽  
Rolf Arne Kleiv
Keyword(s):  
Aqueous Solutions ◽  
Spectrophotometric Method ◽  
Flotation Collectors

Alternative spectrophotometric method for standardization of chlorite aqueous solutions

2007 ◽  
Vol 585 (2) ◽  
pp. 361-365 ◽  
Author(s):  
Marilia Philippi ◽  
Heldiane S. dos Santos ◽  
Aline O. Martins ◽  
Carla M.N. Azevedo ◽  
Marçal Pires
Keyword(s):  
Aqueous Solutions ◽  
Spectrophotometric Method

scholarly journals A New Spectrophotometric Method for Analysis of Allopurinol in Aqueous Solutions and Pharmaceutical Preparations

2009 ◽  
Vol 6 (2) ◽  
pp. 309-314
Author(s):  
Baghdad Science Journal
Keyword(s):  
Absorption Spectrum ◽  
Aqueous Solutions ◽  
Spectrophotometric Method ◽  
Calibration Curve ◽  
Pharmaceutical Preparations ◽  
High Sensitivity ◽  
Good Stability ◽  
Optimum Conditions ◽  
Wide Range

A new method for determination of allopurinol in microgram level depending on its ability to reduce the yellow absorption spectrum of (I-3) at maximum wavelength ( ?max 350nm) . The optimum conditions such as "concentration of reactant materials , time of sitting and order of addition were studied to get a high sensitivity ( ? = 27229 l.mole-1.cm-1) sandal sensitivity : 0.0053 µg cm-2 ,with wide range of calibration curve ( 1 – 9 µg.ml-1 ) good stability (more then24 hr.) and repeatability ( RSD % : 2.1 -2.6 % ) , the Recovery % : ( 98.17 – 100.5 % ) , the Erel % ( 0.50 -1.83 % ) and the interference's of Xanthine , Cystein , Creatinine , Urea and the Glucose in 20 , 40 , 60 fold of analyate were also studied .

A Kinetics Study of the Chemical Stability of Ketoconazole in Aqueous Solutions by Spectrophotometric Method

2011 ◽  
Vol 1 (5-6) ◽  
pp. 370-374 ◽  
Author(s):  
Reza Enayatifard ◽  
Noman Khalili ◽  
Mohammad Rahimizadeh ◽  
Jafar Akbari
Keyword(s):  
Aqueous Solutions ◽  
Chemical Stability ◽  
Spectrophotometric Method ◽  
Kinetics Study

Spectrophotometric study of the complex equilibria of cadmium(II) ions with 4-(2-pyridylazo)resorcine (PAR) using the SQUAD-G program and the method of determining Cd(II) ions with PAR

1982 ◽  
Vol 47 (4) ◽  
pp. 1086-1099 ◽  
Author(s):  
Sylva Vlčková ◽  
Luděk Jančář ◽  
Vlastimil Kubáň ◽  
Josef Havel
Keyword(s):  
Aqueous Solutions ◽  
Spectrophotometric Method ◽  
Calibration Curve ◽  
Linear Part ◽  
Spectrophotometric Study ◽  
Statistical Parameters ◽  
Cadmium Ions ◽  
Graphical Interpretation ◽  
Basic Parameters ◽  
The Individual

The existence of the red-orange CdLH+ complex (λmax = 406 nm, εmax = 1.78.104 mmol-1.cm2, log *β111 = -1.66+0.04) and CdL complex (λmax = 495 nm, εmax = 3.2.104 mmol-1. cm2, log *β112 = -8.25+0.05) was demonstrated in aqueous solutions of PAR with a concentration excess of Cd(II) ions. It was shown that a 10% v/v acetone medium containing Cd(II) in a concentration excess of PAR contains the following complexes: CdL2H2 (λmax = 507 nm, εmax = 1.4 . 104 mmol-1 cm(2), log*β122 = -2.85+0.04), CdL2H- (λmax = 495 nm, εmax = 6.25 . 104 mmol-1 cm2, log *β123 = -9.58 + 0.04) and CdL2-2 (λmax = 495 nm, εmax = 9.16 . 104 mmol-1 cm2, log *β124 = -17.33 + 0.06). The basic parameters of the individual complexes were determined by graphical interpretation using slope-intercept transformations and by numerical interpretation using the generalized SQUAD-G program. The statistical parameters of the spectrophotometric method of determining cadmium ions were evaluated from the linear part of the calibration curve using the STAT program.

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