METHOD FOR ASSAYING NITRATES AND/OR NITRITES IN A NEUTRAL MEDIUM

摘要

The invention relates to a method for assaying nitrate and/or nitrite ions in a solution, using a copper electrode, said method being characterised in that it is carried out in a constant-potential mode, and in that it includes the assaying steps involving: a. applying a potential PA to a copper electrode submerged in a solution to be analysed having a substantially neutral pH, in order to measure the reduction current 10 of the dioxygen likely to be contained in said solution to be analysed; then b. applying a potential PB to the copper electrode, such as to reduce the nitrate ions in order to obtain the measurement of the reduction current 11 corresponding to the reduction of nitrate ions into nitrite ions and to the reduction of the dioxygen; and c. optionally, applying a potential PC to the copper electrode, such as to reduce the nitrate ions and the nitrite ions in order to obtain the measurement of the reduction current 12 corresponding to the reduction of nitrate and nitrite ions into ammonia and to the reduction of the dioxygen.