Dissolved oxygen in boiler system water causes corrosion and pitting of metal surfaces, which can lead to boiler inefficiency, equipment failure, and system downtime. It is essential to keep the dissolved oxygen level as low as possible in most steam generating systems. CHEMetrics’ DEHA test kits allow direct measurement of DEHA (N,N-diethylhydroxylamine).

The Colorimetric Method. DEHA present in the sample reacts with and reduces iron III (ferric state) to iron II (ferrous state), which readily reacts with ferrozine to form a purple colored chelate. The resulting color intensity is directly proportional to the amount of DEHA present in the sample. Results are expressed as ppb (ug/L) or ppm (mg/L) DEHA.

The Ceric Sulfate Titrimetric Method.  The method employs a ceric sulfate titrant and ferroin end point indicator.  DEHA reduces ferric iron to the ferrous state and the resulting ferrous iron is titrated with ceric sulfate titrant using a Titret reverse titration ampoule.  Results are expressed as ppm (mg/L) DEHA.