Section 5 Bench Comparison Testing; Comparable Bench Methods; Bench Method Procedure - Hach APA 6000 Operation Manual

Section 5

5.1 Comparable Bench Methods

5.2 Bench Method Procedure

Copper Calibration Procedure
Prepare standards.
1.
Prepare the Zero
Standard and Standard 1.
6202918bench.fm
Bench Comparison Testing
The procedure presented here uses the APA 6000™ Copper Reagents to
create a correlation between the analyzer and a method performed in the
laboratory.
Other copper procedures may be used to create that correlation. Other
methods presented in Standard Methods for the Examination of Water and
Wastewater should provide comparable results.
Calibration is necessary before testing samples for copper. Calibrating with
Standard 1 (0.0 mg/L) and Standard 2 (low range) (1.0 mg/L) determines the
blank and slope value.
Use the following hints to make calibration more efficient:
• Take all measurements at 25 °C for best accuracy.
• Use polyethylene bottles to store standards.
• If measuring high concentration samples (>5 mg/L Cu
calibration line using the Standard 2 (high range) 10.0 mg/L.
2.
Using a volumetric
pipet, transfer 5 mL of
APA Copper Reagent 2
(indicator) into a 100-mL
volumetric flask. Add about
75 mL of Zero Standard
and mix.
3.
Add 5 mL of APA
Copper Reagent 1 (buffer)
to the same flask. Fill the
volumetric flask to the
mark with the Zero
Standard. Label as
"0 ppm standard".
2+
), verify the
4.
Invert the flask at least
7 times to mix.
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Bench Comparison Testing