408
User- Entered Calibration
There are various programs to determine sulfate, each with a
different level of accuracy. Best results are obtained by
performing a user-entered calibration with each new lot of
reagent. Programs 91 and 92 can be run when a high degree of
accuracy is not needed. Use of the Standard Adjust feature will
improve performance when using programs 91 and 92. It should
NOT be used with a user calibration, as it will hinder
performance.
Using Class A glassware, prepare standards of 10, 20, 30, 40, 50,
60, and 70 mg/L sulfate by pipetting 1, 2, 3, 4, 5, 6, and 7 mL of a
1000-mg/L sulfate standard into 100-mL volumetric flasks.
Dilute to the mark with deionized water and mix well.
Zero the instrument with water. The user-entered settings for
sulfate are:
Program number: #101 to 105
Wavelength: 520 nm
Resolution: 0 mg/L
See Creating User-Entered Program in the instrument manual for
specific instructions on entering a user-entered program.
9.
Press: ZERO
The cursor will move to
the right, then the
display will show:
0 mg/L SO4
10. Within five minutes
after the timer beeps,
place the AccuVac
ampul into the cell
holder. Tightly cover the
sample cell with the
instrument cap.
11. Press: READ
The cursor will move to
the right, then the result
in mg/L sulfate will
be displayed.
Note: If Program 92 is
used, use of the Standard
Adjust is highly
recommended. See
Accuracy Check.
SULFATE, continued
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