ชุดวัดค่าไฮโดรเจน เปอร์ออกไซด์ ( Hydrogen Peroxide Test Kit)
Model : Visual Kits K-5510
Hydrogen peroxide
References:
Colorimetric Methods --
Thiocyanate D.F. Boltz and J.A. Howell, eds., Colorimetric Determination
of Nonmetals, 2nd ed., Vol. 8, p. 304 (1978).
DDPD method - - Developed by CHEMetrics, Inc.
The Titrimetric and Go-No-Go Method - - Developed by CHEMetrics, Inc.
Hydrogen peroxide is a
strong oxidizing agent with a variety of uses. It is commercially
available as a liquid in various concentrations. Applications include
the treating of industrial effluents and domestic waste, and as a
disinfectant in aseptic packaging.
The Colorimetric Methods.
CHEMetrics offers products based on the thiocyanate reagent and the DDPD
reagent.
The Thiocyanate method consists of ammonium thiocyanate and
ferrous iron in acid solution. Hydrogen peroxide oxidizes ferrous iron
to the ferric state, resulting in the formation of a red thiocyanate
complex. Chlorine will not interfere with this method. Ferric iron will
interfere.Results are expressed as ppm (mg/L) H2O2.
The DDPD method is
derived from the DPD method. It offers greater sensitivity and fewer
interferences than the thiocyanate method. Hydrogen peroxide reacts with
DDPD in the presence of potassium iodide to form a blue reaction
product. Results are expressed as ppm (mg/L) H2O2.
The Titrimetric Method
employs ceric sulfate as the titrant and ferroin as the end point
indicator. A color change from green to orange signals the end of the
titration. Results are expressed as percent (%) H2O2.
The Ceric Sulfate Go-No-Go Method.
This pass/fail hydrogen peroxide test was developed as an efficacy test
for hydrogen peroxide based disinfecting solutions with an MEC (Minimum
Effective Concentration) of 6.0+/-1.0%. The kit includes a precision
pipetting device that is used to dispense sample into a reagent solution(ceric
sulfate and ferroin) contained in a vial. An orange color in the vial
indicates that the hydrogen peroxide concentration is greater than 6.0%.
A blue or green color in the vial indicates that the hydrogen peroxide
concentration is less than 6.0%.