18
5 Colorimetric Measurement
5.1 Supported Methods
A wide range of colorimetric methods is supported by the SP-910 analyzer and the
number of them keeps increasing with continuous development of Pyxis. See
corresponding Hach® methods in Appendix A.
Table 2 List of Supported Colorimetric Methods
Free chlorine, DPD method
Total chlorine, DPD method
Bicinchoninate, EPA approved
for reporting wastewater
analysis
Method for N,N-
diethylhydroxylamine and other
oxygen scavengers
Calmagite method for calcium
Calmagite method for
magnesium
Total iron using 1,10-
phenanthroline, USEPA
approved for reporting
wasterwater analysis
Low range molybdate using
ternary complex method
High range nitrite, ferrous
sulfate method
Low range nitrite, diazotization
method, USEPA approved for
reporting wastewater and
drinking water analysis
Reactive phosphate using
molybdovanadate method
Reactive phosphate using
ascorbic acid molybdenum blue
method, USEPA accepted for
wastewater analysis