1—45
Chlorine, Free and Total, HR, continued
Accuracy Check
Standard Additions Method
a. Use the ampule breaker to snap the neck off a high range Chlorine
Standard Solution Ampule, 50–70 mg/L Cl
2
.
b. Use a TenSette
®
pipet to add 0.1, 0.2, and 0.3 mL of standard to three
5-mL samples. Swirl gently to mix.
c. Analyze each sample as described in the procedure. Each 0.1 mL of
standard will cause an incremental increase in chlorine. The exact
value depends on the concentration of the ampule standard. Check the
certificate enclosed with the ampules for calculation of the expected
increase in the chlorine concentration.
Standard Solution Method
Standard solutions for chlorine are difficult and time-consuming to prepare.
Errors can occur if attention to detail is not addressed during preparation of the
standards. The calibration curve is prepared under rigorous analytical
laboratory conditions. Use the factory calibration for most normal testing.
5957088.book Page 45 Friday, March 22, 2013 3:54 PM
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