42-5
BENZOTRIAZOLE AND TOLYLTRIAZOLE, continued
b) Analyze according to the above procedure. If the result is
significantly below 5.0 mg/L, replace the lamp.
STATISTICAL EVALUATION
A single operator repetitively tested samples of two laboratory prepared
solutions, using one DR/700, matched sample cells and two
representative lots of reagent. Testing 10.0 mg/L tolyltriazole
concentration solutions, the standard deviation was ±0.22 mg/L
tolyltriazole. Testing zero concentration samples, the limit of detection
was 0.17 mg/L tolyltriazole.
Testing 10.0 mg/L benzotriazole concentration solutions, the standard
deviation was ±0.11 mg/L benzotriazole. Testing zero concentration
samples, the limit of detection was 0.16 mg/L benzotriazole.
The limit of detection was calculated as three times the standard
deviation when testing zero concentration samples (adapted from
Analytical Chemistry, 1980, 52, 2242-2249).
INTERFERENCES
The following may interfere when present in concentrations exceeding
those listed below:
Acrylates (as methyl acrylate) 50 mg/L
Alum 400 mg/L
Borate (as sodium tetraborate) 4000 mg/L
Chlorine (as Cl
2
)20 mg/L
Chromium (as chromate) 12 mg/L
Copper 10 mg/L
Hardness 500 mg/L as CaCO
3
Iron 20 mg/L
Lignosulfonates 40 mg/L
Magnesium 300 mg/L as CaCO
3
Molybdenum (as molybdate) 200 mg/L
Nitrite 4000 mg/L
Phosphonates (AMP or HEDP) 100 mg/L
Sulfate 200 mg/L
Zinc 80 mg/L
Strong oxidizing or reducing agents present in the sample will interfere
directly.
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