ChemInform Abstract: Electrochemical Determination of Organic Surface Active Substances in Model and Natural Sea Water with Au(111) Monocrystal Electrode.

ChemInform ◽  
2010 ◽  
Vol 31 (22) ◽  
pp. no-no
Author(s):  
Damir Krznaric ◽  
Tihana Goricnik ◽  
Bozena Cosovic
Keyword(s):  
Sea Water ◽  
Electrochemical Determination ◽  
Surface Active ◽  
Active Substances

scholarly journals Simple Electrochemical Determination of Surface-Active Substances in Natural Waters

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Željka Cvrković-Karloci ◽  
Damir Krznarić ◽  
Marijan Šeruga ◽  
Božena Ćosović
Keyword(s):  
Humic Acid ◽  
Natural Waters ◽  
Electrochemical Determination ◽  
Danube River ◽  
Calibration Plot ◽  
Linear Calibration ◽  
Capacitive Current ◽  
Surface Active ◽  
Active Substances

A simple electrochemical determination of surface-active substances by using time-dependent variation of the capacitive current in a.c. voltammetry at the HMDE is described. Surface-active substances were accumulated by stirring solution at the deposition potential of −0.6 V versus Ag/AgCl (sat. NaCl). The capacitive current was recorded for different deposition times in the range 0–120 s, wherefrom the linear calibration plot is constructed. The proposed method was verified for model surfactant TritonX-100 in the concentration range 0.02–0.25 mg/L and for humic acid in the concentration range 1.65–20 mg/L. The application of the method was demonstrated for freshwater samples of the Drava river, Danube river, and the wetland Kopački Rit, Croatia. The shape of theiac-Ecurves as well as the obtained concentrations of surface-active substances by using humic acid as the calibration substance are quite well describing the type and the nature of organic matter in the freshwater samples.

Comparison of the reactions of ferric ions with Chromazurol S, Eriochromazurol B and Eriochromcyanine R in the presence of surface active substances and spectrophotometric determination of Fe(III)-ions with Chromazurol S-cetylpyridinium bromide system

1980 ◽  
Vol 45 (10) ◽  
pp. 2656-2669 ◽  
Author(s):  
Vlastimil Kubáň ◽  
Dagmar Gotzmannová
Keyword(s):  
Ferric Ions ◽  
Cetylpyridinium Bromide ◽  
Absorption Coefficients ◽  
Statistical Parameters ◽  
Spectrophotometric Methods ◽  
Chromazurol S ◽  
Surface Active ◽  
Active Substances ◽  
Serum Components

The spectrophotometric methods of determining Fe(III) ions with Chromazurol S, Eriochromazurol B and Eriochromcyanine R in the presence of cationic, anionic and nonionic tensides were compared using the basic optical and statistical parameters. A method was proposed and developed for the determination of Fe(III) ions using Chromazurol S in blood serum and plasma at pH 4.7-5.0 in a medium of 2 . 10-4M cetylpyridinium bromide and 0.1M pyridine buffer and at pH 6.0-6.5 in a medium of 2 . 10-3M cetylpyridinium bromide and 0.1M hexamethylenetetramine buffer with molar absorption coefficients of 1.31 . 105 and 1.40 . 105, respectively. The determination is sufficiently specific even at pathological concentrations of the other serum components.

Ion Pairs of 5,5-dimethyl-2-(2-hydroxy-3,5-disulfophenylhydrazo)cyclohexane-1,3-dione with Cationic Surface-Active Substances as Analytical Reagent for Determination of Copper(II)

2010 ◽  
Vol 43 (18) ◽  
pp. 2923-2938 ◽  
Author(s):  
Kamran T. Mahmudov ◽  
Abel M. Maharramov ◽  
Rafiga A. Aliyeva ◽  
Ismayil A. Aliyev ◽  
Maximilian N. Kopylovich ◽  
...  
Keyword(s):  
Ion Pairs ◽  
Surface Active ◽  
Analytical Reagent ◽  
Determination Of Copper ◽  
Active Substances
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