Chapter 8
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Absorbance, % Transmittance and Concentration Measurements
148
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Orion AquaMate Spectrophotometer User Manual
Thermo Scientific
Using the Conc/Std Mode to Measure Concentration
In this mode, a standard sample of well known concentration is used to determine the
concentration of samples. When the standard concentration is precisely known, the Abs / %T of
the standard and the Abs / %T of the unknown sample are measured and the sample
concentration is calculated. The measurement can be expressed mathematically as:
Standard Concentration = Sample Concentration
Abs / %T of Standard
Abs / %T of Unknown Sample
1.
If necessary, press the Change Mode function key until Conc/Std is set as the mode.
2.
If necessary, press the Set nm function key to set the wavelength value. Use the numeric
keypad to enter the wavelength value for taking measurements. Press the Set nm function
key again to save the entered wavelength value
3.
Prepare the blank and standard that will be used to calculate sample concentration.
4.
Place the blank in the B position and press the Measure Blank function key. Once the
blank has been measured, remove it from the carousel.
5.
Press the Units/Standard function key to set the units and measure the standard.
a.
Press the Enter Conc function key, use the numeric keypad to enter the
concentration of the standard and press the enter key.
b.
Press the Select Units function key, press the ▲or ▼ key to highlight the desired
units and press the enter key.
c.
Place the sample in the appropriate position on the vial holder carousel. If needed,
use the Sample Positioner keypad to set the vial location. Press the Measure
Standard function key. The instrument will measure the absorbance of the standard
and display the absorbance and calculated factor.
6.
Press the esc key to return to the main measurement mode.
7.
Place the sample in the appropriate position on the vial holder carousel. If needed, use the
Sample Positioner keypad to set the vial location. The concentration measurement will be
shown on the instrument display.
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