10
Water Analysis Application
Using a Reverse Color Method
Thermo Scientific
Orion AquaMate 7000 Vis and Orion AquaMate 8000 UV-Vis
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16. To save the adjustment correction factor to the test method, press the
Save Test
function
key and overwrite the existing test method or save as a new test method.
17. Press the
Run Test
function key.
When running a test with an adjustment correction factor in use, the display will show
(1pt Adj) next to the test name.
Using a Reverse Color Method
Reverse color methods are recognizable as those which have a negative factor (i.e., the slope of
the calibration curve is negative). For these methods, the chemistry used to make the
measurement causes a dark color (high absorbance) for very low concentrations of analyte,
and an increasingly lighter color (lower absorbance) as the concentration of the analyte
increases. Chemical Oxygen Demand (COD) is an example of a test that is often run using a
reverse color chemistry.
