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Voltammetric determination of Aclonifen at a silver amalgam electrode in drinking and river water

Novotný V., Barek J.

Ecological Chemistry and Engineering. S

2017

Vol. 24, nr 2

277--284

A method for the determination of pesticide Aclonifen (AC) in drinking and river water by differential pulse voltammetry (DPV) on a meniscus modified silver solid amalgam electrode (m-AgSAE) using solid phase extraction (SPE) as a cleanup and preconcentration procedure is described. The limit of detection (LOD) for direct DPV determination of AC in deionized water is 2.7·10-8 mol·dm-3. LOD for DPV determination of AC in tap water after SPE is 1.6·10-10 mol·dm-3, the recovery being 55%. LOD for the determination of AC in Vltava river water is 1.9·10-9 mol·dm-3, the recovery being 65%. Humic acids interfere with the determination in river water; this problem can be resolved by adjusting the pH of the extracted sample to 6. The advantages of this approach are high sensitivity, low LOD, quick and easy sample preparation and fast determination.

A voltammetric technique using a modified carbon paste electrode for the determination of aclonifen

Novotný V., Barek J.

Ecological Chemistry and Engineering. S

2015

Vol. 22, nr 3

451--458

A method for the determination of aclonifen at a carbon paste electrode modified with tricresyl phosphate has been developed. The optimum electrochemical regime proved to be differential pulse voltammetry (DPV) in the negative potential range from −200 to −1600 mV. The optimum pH for the determination proved to be pH = 8. The calibration dependence is linear and the limit of detection achieved for the method was 2·10−6 mol/dm3. The method is fast, reliable and it is suitable for the detection of aclonifen in the concentration range from 2·10−6 to 1·10−4 mol/dm3.

Opisano metodę oznaczania aklonifenu węglową elektrodą pastową, modyfikowaną za pomocą fosforanu trikrezylu. Optymalnym systemem elektrochemicznym w badanej metodzie jest woltamperometria pulsowo-różnicowa (DPV) w ujemnym zakresie napięć od −200 do −1600 mV. Optymalne pH badanej metody wynosi 8. Krzywa kalibracyjna ma charakter liniowy z granicą wykrywalności 2·10−6 mol/dm3. Opisana metoda jest szybka, niezawodna oraz przydatna do oznaczania aklonifenu w zakresie stężeń od 2·10−6 do 1·10−4 mol/dm3.