Sampling And Storage; Accuracy Check - Hach POCKET COLORIMETER II Instruction Manual

Chloramine (Mono),
continued
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Sampling and Storage

Analyze samples for monochloramine immediately after collection. If sampling
with the sample cell, rinse the cell several times with the sample, then carefully fill
to the 10-mL mark. If sampling from a tap, let the water flow for at least 5 minutes.
Let the container overflow with the sample several times, then cap the container so
there is no headspace (air) above the sample.

Accuracy Check

Standard Solutions Method
Standard solutions for monochloramine are difficult and time-consuming to
prepare. Errors can occur if attention to detail is not addressed during preparation
of the standards. Hach Company prepares the calibration curve under rigorous
analytical laboratory conditions. Hach recommends using the factory calibration.
A user calibration or a user-prepared monochloramine standard may be required
by a regulatory official or agency. Two options are available on the
Pocket Colorimeter™ II to meet this requirement.
A monochloramine standard may be prepared and used to validate the calibration
curve using the Standard Calibration Adjust feature (see page 2—13 for more
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