Cuprous oxide/ionic liquid/composite carbon paste electrode and application thereof

Abstract

The invention discloses a cuprous oxide / ionic liquid / composite carbon paste electrode and application thereof, relating to the trivalent arsenic electrochemical detection field. The cuprous oxide / ionic liquid / composite carbon paste electrode is prepared from cuprous oxide, graphite powder, ionic liquid and adhesive by a grinding method; the composite carbon paste electrode serving as a working electrode, a saturated calomel electrode serving as a reference electrode, and a platinum sheet serving as a counter electrode are combined to form a three-electrode system; trivalent arsenic is detected in a 0.01-0.5mol / L phosphate buffered solution with pH value of 3-10; and the scanning rate is 0.05-0.2V / s and the electric potential range is -0.8V to 0.8V. The cuprous oxide / ionic liquid / composite carbon paste electrode has the characteristics of simplicity in preparation method, large specific surface area, easiness in electrode surface updating, wide electric potential range, low price, good reproducibility and the like, and can be used for detecting trivalent arsenic in a water sample conveniently, sensitively and rapidly in an online manner.

Description

technical field [0001] The invention relates to the field of electrochemical analysis, in particular to the preparation of a composite carbon paste electrode and its use in electrochemically detecting trivalent arsenic. Background technique [0002] Electroanalytical chemistry is a kind of analytical method established on the basis of measuring the electrical response signal of a certain chemical system or sample. It has the advantages of high accuracy, good selectivity, simple operation, and online detection of target objects. In the past, electroanalytical chemistry used the mercury drop electrode as the working electrode, which has the characteristics of high sensitivity, easy access to new interfaces, and wide potential range, but there are also some problems, such as toxicity and volatility. In recent years, glassy carbon electrodes, gold electrodes, platinum electrodes, etc. have been gradually used as working electrodes. The surface of these electrodes is easily poll...

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Problems solved by technology

In addition, during the mining of arsenic-containing minerals, arsenic enters the surface and groundwater sources due to leaching, which in turn causes arsenic pollution in drinking water sources

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