Hach Pocket Colorimeter II Instruction Manuals page 32

Bromine, Total, HR,
continued
Standard Solution Method
Standard solutions for bromine or chlorine 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 strongly recommends using the factory calibration.
A user calibration or a user-prepared bromine standard may be required by a regulatory
official or agency. Two options are available on the Pocket Colorimeter II to meet this
requirement.
A bromine standard may be prepared and used to validate the calibration curve using
the Standard Calibration Adjust feature (see page 2—13 for more information.). The
concentration of the prepared standard must be determined with an alternate
instrument such as a spectrophotometer, colorimeter, amperometric titration, or by
using another alternate method. The concentration of the bromine standard for the low
range procedure must be between 2.00 and 4.00 mg/L bromine and between 2.0 and 8.0
mg/L bromine for the high range procedure.
In addition, a user-generated calibration curve can be made and programmed into the
Pocket Colorimeter™ II. See User-Entered Calibration on page 2—15.
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