Potentiometric sensors to detect copper ions

摘要

The proposed technical solution relates to the field of analytical chemistry and can be used for determining the copper ion (II) in aqueous solutions. An object of the creation of this utility model is to simplify the design of the sensor, reducing the cost of the sensor, to extend the range of detectable concentrations of copper ions and lowering the limit of detection, reducing the volume of the analyzed sample solutions and sizes. The claimed technical solution eliminates the disadvantages inherent to prior art, and ensures the implementation of the task. The technical result consists in simplifying the construction of the sensor (no polymer ion-selective membrane) due elektropolimerizovannogo polyaniline and pillar [5] arene in a free state, to provide a wide range of detectable concentrations of copper ions (II) - to 5.5 orders of magnitude concentration (5 × 10 ^-7 -1 × 10 ^-1 M) and in lowering the detection limit of the sensor (1 × 10 ^-7 M) by using the electroconductive layer and pillararena elektropolimerizovannogo polyaniline in the composition sensor to reduce the cost of the sensor due to lack of I as part of the sensor expensive ionophores in reducing sample volumes to levels of less than 1 ml by the use of printing of electrodes of small sizes (diameter of 2-3 mm the working surface of the printed electrode). The technical problem is solved by the presence on the surface of the printed electrode conductive layer elektropolimerizovannogo polyaniline facilitates electron exchange at the interface, and by finding ionophore - Pillar [5] arene (Figure 1). - on the sensor surface (. FIG 2) in the free at present, in the absence of PVC plastic film and additional components. The resulting ion-selective membrane consisting of only one ionophore on the surface of the electrically conductive polyaniline, has a simple structure, low cost, low manufacturing time due to lack of (spent few minutes to drip pillararena applying from solution in an organic solvent followed by drying) in its composition film former. Potentiometric sensor for determining the concentration of copper ions in an aqueous solution based on printed electrodes formed by screen printing a graphite paste, characterized in that the working area of ​​the electrode is covered with a layer elektropolimerizovannogo polyaniline on the surface of which the pillar [5] arene in a free state. Such embodiment potentiometric sensor provides a technical result - the simplicity of the sensor structure and low cost sensor (due to lack of multicomponent polymeric PVC membrane), small sensor size and the possibility to carry out a determination of small volumes of sample to 1 ml (diameter of the working surface of the sensor 2-3 mm) , a wide range of detectable concentrations of copper ions (5.5 orders of magnitude) and low detection limit (0.1 uM) - due to the electrically conductive layer of polyaniline and ionophore - pillar [5] arene - on its surface minute in a free state, forming self-assembling nano-scale architecture in which no steric hindrance to access of copper ions to the functional groups of the receptor and to the sensor surface, resulting in reduced detection limit and range of determined concentrations, N.C. Fct, 3 FIG.