scholarly journals Sorption-spectrophotometric method for the determination of Pd(II) in aqueous solutions

2004 ◽  
Vol 69 (4) ◽  
pp. 309-317 ◽  
Author(s):  
Vesna Vasic ◽  
Jasmina Savic ◽  
Nikola Vukelic
Keyword(s):  
Detection Limit ◽  
Ion Exchange ◽  
Contact Time ◽  
Absorption Maximum ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Immobilized Reagent ◽  
Disulphonic Acid ◽  
Dowex 1

The reaction of Pd(II) with 1,8-dihydroxy-2-(pyrazol-5-ylazo)-naphthalene 3-6-disulphonic acid (PACA) sorbed onto Dowex 1-X8 ion-exchange resin was investigated with the aim of developing an absorption-spectrophotometric analytical method for the determination of low Pd(II) concentrations in water. The immobilized reagent formed a 1:1 complex with Pd(II) having an absorption maximum at 650 nm. Parameters, such as pH, wavelength and contact time were optimised for a given amount of the sorbed reagent. The linearity range of absorbance vs. Pd(II) concentration extended from 5x10-6 ? 5x10-5 M 5x10-7 ? 5x10-6 and 2.5x10-8 ? 2.5x10-7 M when using 10, 100 and 200 ml of sample solution, respectively. With a 200 ml sample, the detection limit was 2.5x10-7 M Pd(II). Most metals, except Cu(II), did not interfere when present in up to 100 times the concentration of Pd(II).

Fluorometric Determination of Chlortetracycline in Mixed Feeds

1964 ◽  
Vol 47 (2) ◽  
pp. 203-208
Author(s):  
Stanley E Katz ◽  
Joseph Spock
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ammonium Hydroxide ◽  
Solvent System ◽  
Ion Exchange Resin ◽  
Alkaline Degradation ◽  
Fluorometric Determination ◽  
Mixed Feeds ◽  
Microbiological Assays

Abstract The fluorometric procedure for chlortetracycline in mixed feeds is based upon the degradation of chlortetracycline in alkaline solution to isochlortetracycline. The fluorescence of the isochlortetracycline is directly proportional to the concentration of chlortetracycline present prior to alkaline degradation. Chlortetracycline is extracted from mixed feeds with an acidmethanol solvent system, separated from the feed extract by adsorption on a Dowex 50 ion exchange resin, and eluted from the resin by ammonium hydroxide after conversion to isochlortetracycline. The isochlortetracycline is measured fluorometrically. Recoveries from known feeds are generally greater than 90% and agreements with microbiological assays are very close.

Determination of cadmium(II) with a carbon paste electrode modified with an ion-exchange resin

The Analyst ◽  
1989 ◽  
Vol 114 (3) ◽  
pp. 397-399 ◽  
Author(s):  
Lucas Hernández ◽  
Jose M. Melguizo ◽  
Manuel H. Blanco ◽  
Pedro Hernández
Keyword(s):  
Ion Exchange ◽  
Carbon Paste Electrode ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Carbon Paste ◽  
Paste Electrode

Determination of radium in water by liquid scintillation counting after preconcentration with ion-exchange resin

1984 ◽  
Vol 56 (4) ◽  
pp. 761-763 ◽  
Author(s):  
Hideo. Higuchi ◽  
Masaki. Uesugi ◽  
Kaneaki. Satoh ◽  
Naoyuki. Ohashi ◽  
Masayasu. Noguchi
Keyword(s):  
Ion Exchange ◽  
Liquid Scintillation Counting ◽  
Liquid Scintillation ◽  
Exchange Resin ◽  
Ion Exchange Resin ◽  
Scintillation Counting

Determination of serotonin in tissues using an ion-exchange resin

1964 ◽  
Vol 9 (5) ◽  
pp. 427-433 ◽  
Author(s):  
Virginia E. Davis ◽  
J.A. Huff ◽  
H. Brown
Keyword(s):  
Ion Exchange ◽  
Exchange Resin ◽  
Ion Exchange Resin
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