Hach POCKET COLORIMETER II, Instruction Manuals

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1—22
Bromine, Total, LR,
continued
Sampling and Storage
Analyze samples immediately. Do not collect samples in plastic containers.
Accuracy Check
Standard Additions Method
1. Snap the neck off a low range Chlorine Standard Solution PourRite
®
Ampule,
20–30 mg/L Cl
2
.
2. Use a TenSette
®
pipet to add 0.1, 0.2, and 0.3 mL of standard to three 10-mL
samples. Swirl gently to mix. (For AccuVac Ampuls, use 0.3, 0.6, and 0.9 mL
of standard and a 30-mL sample in a 50-mL beaker.)
3. Analyze each sample as described in the procedure. Each 0.1 mL of standard
will cause an incremental increase in the apparent bromine concentration. The
exact value depends on the concentration of the ampule standard. Check the
certificate enclosed with the standard ampules for the chlorine concentration.
Multiply the expected chlorine concentration by 2.25 to determine the
expected increase in bromine concentration.