Voltammetric Determination of 8-Nitroquinoline Using a Silver Solid Electrode and Its Application to Model Samples of Drinking and River Water
Abstract
This work is focused on the application of a silver solid electrode (AgE) for the development of modern voltammetric methods for the determination of submicromolar concentrations of biologically active compounds present in the environment. 8-Nitroquinoline (8-NQ), a well-known chemical carcinogen, was chosen as a model substance. Differential pulse voltammetry (DPV) was used to study electrochemical behavior of 8-NQ in different aqueous matrices.
The following optimal conditions for determination of 8-NQ in the concentration ranges from 2 to 100 mu molL(-1) were used: Britton-Robinson (BR) buffer of pH 3.0, the regeneration potentials cycles (E-in=-1000 mV, E-fin=-100 mV) and constant cleaning potential -2000 mV. Practical applicability of AgE for the determination of micromolar concentrations of 8-NQ was verified on model samples of drinking and river water.