Voltammetric Determination of Aclonifen at a Silver Amalgam Electrode in Drinking and River Water

Abstract

Abstract: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.

Investigation of Biosensor Potential Component Stability Caused by Influence of External Condition

“…Therefore, the recent years show increased interest in development of such devices, both with respect to research and construction. Biosensors are extensively used in:  environment protection [11][12][13][14] where they are a tool to detect water contaminants, harmful gases and various odorants  food industry [15][16][17][18][19][20][21][22] where they are used to detect pesticides examination of product freshness, harmful toxins contained in food, assessment of fungal contamination in grain and detection of specific odorant molecules in nourishment  defense industry, where they are used to detect warfare agents [22]  in medicine, where they are extensively used for diagnostics [23][24][25][26][27][28] to detect markers in cancerous processes, concentration of sugar in blood, detect bacteria and viruses or early identification of diseases, infections and metabolic disorders [29]. Despite the extensive applications of biosensors, there are continuous attempts to improve the existing devices and develop a new generation of sensors.…”