Method Performance; Standard Calibration Adjust Method - Hach POCKET COLORIMETER II Instruction Manual

Ammonia, Nitrogen,
continued
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Standard Solution Method
Prepare a 0.60 mg/L NH –N standard by pipetting 6.0 mL of a 10 mg/L Ammonia
3
Nitrogen Standard into a 100-mL volumetric flask. Dilute to 100 mL with
ammonia-free water. Use 10 mL of this 0.60 mg/L ammonia nitrogen standard
directly in step 3 of the procedure. Perform the procedure as described.

Method Performance

Precision
Typical Precision (95% Confidence Interval) = 0.60 ± 0.05 mg/L NH –N
3
Estimated Detection Limit
EDL = 0.01 mg/L NH –N
3

Standard Calibration Adjust Method

To perform a standard calibration adjustment using the 0.60 mg/L ammonia–
nitrogen standard or using an alternative concentration, see Standard Calibration
Adjust on page 2—13.
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