1—44
Chlorine, Free and Total, HR, continued
Accuracy Check
Standard Additions Method
a. Snap the neck off a high range Chlorine Standard Solution Voluette
®
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 separate
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 Voluette ampule standard. Check the certificate enclosed
with the Voluette 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.
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