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Deionized water (DI) as the blank calibration solution and the 100 ppb PTSA
calibration standard solution are needed.
1. Press the FCal icon to launch the calibration page.
2. Follow the message prompts, insert the DI blank into the sample vial compartment
and press the OK key.
3. Follow the message prompts, and insert the 100 ppb standard into the sample vial
compartment and press the OK key.
4. Press the OK key to return to the main page.
Figure 7 PTSA Calibration
If calibration fails, the followings should be checked:
The DI blank is being contaminated.
The 100 ppb PTSA standard solution is decayed or being contaminated.
The light shield door is not in the closing position.
The sample vial compartment is blocked with debris, water, or other materials.
The 100 ppb standard solution shall be stored in a brown or black opaque bottle.
Exposing the PTSA standard to light will cause the standard losing the PTSA
concentration. Many substances, such as quaternary amine cause a negative
interference. Many other substances such laundry detergents that contain optical
brightener will cause a significant positive interference.
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