Benzotriazole or Tolyltriazole
Benzotriazole or Tolyltriazole
Benzotriazole_PP_Other_UVP_Eng_Ody.fm Page 3 of 4
Sample Collection, Storage, and Preservation
The most reliable results are obtained when samples are analyzed as soon as
possible after collection.
Accuracy Check
Standard Additions Method (Sample Spike)
1. After reading test results, leave the sample cell (unspiked sample) in the
instrument.
2. Touch
Options. Touch Standard Additions. A summary of the standard
additions procedure will appear.
3. Touch
OK to accept the default values for standard concentration, sample
volume, and spike volumes. Touch
Edit to change these values. After values
are accepted, the unspiked sample reading will appear in the top row. See
Standard Additions in the instrument manual for more information.
4. Open a 500-mg/L Benzotriazole Standard Solution.
5. Prepare three sample spikes. Fill three mixing cylinders with 25 mL of
sample. Use the TenSette Pipet to add 0.1 mL, 0.2 mL, and 0.3 mL of standard,
respectively, to each sample and mix thoroughly.
6. Analyze each sample spike as described in the procedure above, starting with
the 0.1 mL sample spike. Accept each standard additions reading by touching
Read. Each addition should reflect approximately 100% recovery.
7. After completing the sequence, touch
Graph to view the best-fit line through
the standard additions data points, accounting for matrix interferences. Touch
View: Fit, then select Ideal Line and touch OK to view the relationship between
the sample spikes and the “Ideal Line” of 100% recovery.
See Section 3.2.2 Standard Additions on page 32 for more information.
Chromium (as chromate) Greater than 12 mg/L
Copper Greater than 10 mg/L
Hardness
Greater than 500 mg/L as CaCO
3
. Add 10 drops of Rochelle Salt Solution (Cat. No. 1725-33)
before adding reagent.
Iron Greater than 20 mg/L
Lignosulfonates Greater than 40 mg/L
Magnesium Greater than 300 mg/L as CaCO
3
Molybdenum (as molybdate) Greater than 200 mg/L
Nitrite Greater than 4000 mg/L. Adjust the pH to 4–6 with 1 N sulfuric acid (Cat. No. 1270-32).
Phosphonates (AMP or
HEDP)
Greater than 100 mg/L
Sulfate Greater than 200 mg/L
Zinc Greater than 80 mg/L
Strong oxidizing or reducing
agents
Interfere at all levels
Interferences (continued)
Interfering Substance Interference Levels and Treatments
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