Potassium
Potassium
Page 4 of 6
Potassium_PP_Other_TPB_Eng_Ody.fm
User Programming
1. Touch
User Programs on the main menu.
2. If you have not performed a potassium calibration before, touch
Program
Options
and New Program.
3. Assign a program number to the potassium user program. Touch
OK.
4. Select
Wavelength. Touch Edit. Enter 650. Touch OK.
5. An editable list of parameters will appear on the screen. Touch
Calibration: C = a + bA. Touch Edit. Touch Curve Fit.
6. Perform steps 3 through 6 of the procedure, substituting the potassium
standards for the sample.
7. Fill a 25-mL cell with deionized water and place it in the cell holder. Touch
+.
Input a concentration of 0.0 mg/L. Touch
OK. Touch Zero.
8. Touch the down arrow and then touch
+ to add the next standard. Key in the
concentration of the standard. Touch
OK. Touch Read for the standard
absorbance. Repeat this step until all the standards have been read.
9. When all the absorbances have been read, touch
Graph to view the calibration
graph. Touch
Force 0 to force the curve through zero. Touch Next Formula
until the formula displayed above the graph gives the best curve fit. Touch
Done to return to the calibration screen. Touch OK to return to the
parameter list.
10. Edit the following parameters:
11. When the parameters have been edited, touch
Done. Touch Yes to save the
program. The information is now stored as a User Calibration, and the
program is ready for use.
Method Performance
Precision
Standard: 5.0 mg/L K
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Name: Potassium
Units: mg/L
Chemical Form1: K
Wavelength: 650 nm
Resolution 0.1
Upper Limit: 7.0
Lower Limit: 0.0
Timer 1: 3:00
Program 95% Confidence Limits of Distribution
905 4.6–5.4 mg/L K
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.1 mg/L K
To Next Page
Loading...
