Redox with Relative Hydrogen Sensors and Method

A gas treatment system comprising:

• a reduction unit configured to contact an influent gas stream with a metal chelant stream and release a treated gas stream separate from the metal chelant stream;
• an oxidation unit downstream of the reduction unit, the oxidation unit configured to contact an oxidation stream and the metal chelant stream and release the metal chelant stream;
• the metal chelant stream circulated from the reduction unit to the oxidation unit and the metal chelant stream circulated from the oxidation unit to the reduction unit;
• a pH sensor and an ORP sensor operatively connected to the metal chelant stream, the pH sensor configured to provide a pH value of the metal chelant stream and the ORP sensor configured to provide an ORP value of the metal chelant stream;
• and
• a transmitter connected to the pH sensor and the ORP sensor, the transmitter configured to determine an rH value, based on the pH value and ORP value, of the metal chelant stream.