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.

Direct determination of surface active substances in natural waters

1987 ◽  
Vol 22 (2-4) ◽  
pp. 363-373 ◽  
Author(s):  
Bo<zena Ćosović ◽  
Vjero<cka Vojvodic
Keyword(s):  
Natural Waters ◽  
Direct Determination ◽  
Surface Active ◽  
Active Substances

Electrochemical determination of arsenic in natural waters using carbon fiber ultra-microelectrodes modified with gold nanoparticles

Talanta ◽  
2017 ◽  
Vol 166 ◽  
pp. 198-206 ◽  
Author(s):  
Patricio Carrera ◽  
Patricio J. Espinoza-Montero ◽  
Lenys Fernández ◽  
Hugo Romero ◽  
José Alvarado
Keyword(s):  
Gold Nanoparticles ◽  
Carbon Fiber ◽  
Natural Waters ◽  
Electrochemical Determination

scholarly journals Electrochemical Determination of Furosemide Drug at Tranexamic Acid Gold Nanoparticles Modified Glassy Carbon Electrode

2021 ◽  
Vol 22 (1) ◽  
pp. 172-179
Author(s):  
Tasawar Ali Chandio
Keyword(s):  
Gold Nanoparticles ◽  
Tranexamic Acid ◽  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Supporting Electrolyte ◽  
Electrochemical Determination ◽  
Calibration Plot ◽  
Carbon Electrode ◽  
Modified Glassy Carbon Electrode

The reported work discussed the simpler and sensitive strategy for the electrochemical determination of furosemide by employed tranexamic acid derived gold nanoparticles modified glassy carbon electrode (GCE). The synthesis of tranexamic acid derived gold nanoparticles (Tr- AuNps) was carried out using single step approach. The synthesized Tr-AuNps were characterized by using atomic force microscopy (AFM), illustrated that the particles are spherical in shape with an average size of 35 nm. The synthesized AuNps have modified the sensing surface of GCE. The modified GCE demonstrated highly catalytic behavior for the oxidation of loop diuretic drug furosemide. The influence of pH and supporting electrolyte was examined and the working conditions were optimized. The amperometric determination of furosemide was also carried out at the Tr-AuNps modified GCE under stirred conditions using Britton Robinson buffer (BR buffer) as supporting electrolyte at pH 5. The linear calibration plot showed the dependence of the peak current on increasing concentrations of furosemide in the range of 50 μM to 500 μM furosemide with the detection limit of 5 μM. The proposed sensing plan has been successfully employed for the quantification of furosemide in human urine samples with satisfactory recoveries.

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