On-line wet chemistry analyzer

A wet chemistry analyzer comprising:

• a reaction chamber configured to receive a reactant solution from a sample inlet and facilitate a process reaction;
• a detection chamber, fluidically connected, through a first three-way valve to the reaction chamber, wherein the detection chamber is configured to receives a portion of a reaction mixture from the reaction chamber while the process reaction is ongoing and before the process reaction is completed;
• and
• wherein the reaction chamber and the detection chamber are fluidically connected, through the first three-way valve, wherein the portion of the partially reacted reaction mixture is provided to the detection chamber and is configured to pre-condition a surface inside the detection chamber while the process reaction is occurring in parallel and proceeds to completion.