Hach DR/700 - Page 87

42-3
BENZOTRIAZOLE AND TOLYLTRIAZOLE, continued
7. Turn the UV lamp
on.
Note: A yellow color
will develop if triazole is
present.
8. Wait 5 minutes. 9. Turn the lamp off.
Remove lamp from
the bottle Swirl to
mix thoroughly.
Note: Low results will
occur if photolysis
(lamp on) takes place
for more or less than
five minutes.
Note: Avoid fingerprints
on the quartz surface of
the lamp. Rinse the
lamp and wipe with a
soft, clean tissue
between tests.
10. Fill a 10-mL cell
to the 10-mL line
with the prepared
sample.
11. Fill another
10-mL cell to the
10-mL line with
sample (the blank).
12. Place the blank
in the cell holder.
5 minutes