Photometric Accuracy
Potassium Nitrate solution
Prepare 1.065 % w/v. 0.710 % w/v, 0.355 % w/v solution of Potassium Nitrate (Previously dried at 130 o C) .
Go to Photo metric mode
- Press Ctr + M
- Add wavelength 302 nm { Select RAW DATA }
- Auto zero
- Then keep the Potassium Nitrate Solution in the sample cell holder & using water as a blank.
- Close the cell compartment.
- Click Start
- And record the observed Abs.
Acceptance criteria:-
| Concentration % w/v | Absorbance limit |
|---|---|
| 1.065 % | 0.741 to 0.761 |
| 0.710 % | 0.490 to 0.510 |
| 0.355 % | 0.240 to 0.260 |
 |
| Screenshot of UV Photometric Accuracy |
If calibration is satisfactory then affix the status label on it with the next due calibration date.
Frequency
Once in a 3 month