Hach DR/700 - Page 95

42-11
COPPER, continued
7. Add the contents
of one Porphyrin 2
Reagent Powder
Pillow to each sample
cell. Cap and invert
several times to mix.
Note: The yellow color
will turn blue
momentarily. If any
copper is present, the
sample will return to
yellow.
8. Wait 3 minutes. 9. Place the blank in
the cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
blank and 10 mL of the
sample to a
10-mL sample cell and
proceed.
3 minutes