Arsenic
Arsenic
Arsenic_None_Other_SDC_Eng_Ody.fm Page 5 of 6
Calibration
Standard Preparation
Perform a new calibration for each lot of arsenic absorber solution.
1. Prepare a 10.0-mg/L arsenic working standard by pipetting 10.0 mL of
Arsenic Standard Solution, 1000 mg/L As (Cat. No. 14571-42) into a 1000-mL
volumetric flask.
2. Dilute to volume with deionized water.
3. Into three different 500-mL volumetric flasks, pipet 1.0, 2.0, and 10.0 mL of the
10.0 mg/L As stock solution using Class A glassware.
4. Dilute to the mark with deionized water and mix thoroughly. These standards
have concentrations of 0.02, 0.04 and 0.20 mg/L As.
User Programming
1. Touch
User Programs on the main menu.
2. If you have not performed an arsenic calibration before, touch
Program
Options
and New Program. Key any available program number (950–999) to
use for arsenic testing. Touch
OK. You are now in the Edit Program mode. Fill
in the appropriate fields using the touch screen by touching
Edit when the
field is highlighted. Use the alphanumeric keys to name your User Program
Arsenic. Set up the rest of the parameters as follows:
If you already have a working arsenic program, highlight
Program Options,
then touch Edit Program.
3. Touch
Calibration: C = a + bA.
4. Touch
Edit. Touch Curve Fit. Touch +.
5. Enter the mg/L value of the sample to be read and touch
OK.
6. Place the 25-mL sample cell containing only unreacted arsenic absorber
solution into the cell holder. Touch
Zero.
7. Place the prepared sample in the cell holder. Touch
Read to accept the
absorbance value. Repeat steps 4 through 6 for each standard.
8. Touch
Graph. Make sure Force Zero is off.
9. If the graph is acceptable touch
Done.
10. Touch
OK. Touch Save Program. Touch Done.
The program is ready for use.
Some variations of the calibration procedure are possible. See the Instrument
Manual for details.
Units
mg/L
Upper Limit
0.220 mg/L
Resolution
0.001
Lower Limit
-0.020 mg/L
Wavelength
520 nm
Timer1
15 minutes
Timer2
15 minutes
Timer3
15 minutes
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