Method for cleaning and/or regenerating a glass microfluidic sensor for the analysis of metals

A microfluidic method for cleaning and/or regenerating at least one microfluidic sensor comprising at least one glass microchannel forming a microfluidic circuit and at least two electrodes, comprising at least the following steps:

• a step N) to clean the microfluidic circuit, comprising at least two following sub-steps and including at least sub-step N1:
• N1:
• a sub-step to clean the microfluidic circuit, comprising the injection and circulation of a fluid sample in the microchannel;
• N2:
• a sub-step to clean at least one electrode, sub-step N2 comprising the use of sulfuric acid in the microchannel to clean at least one electrode by cyclic voltammetry, and comprising measurement of the active surface of the electrode to verify that it still remains equal to a target value in particular +/−10%;
• N3:
• a deposition sub-step on at least one electrode;
• and
• N4:
• a control sub-step;
• and
• a step to clean the microfluidic circuit, comprising at least the circulation of a nitric acid solution in the microchannel.