Hach DR2400 - Page 80

Aluminum
Aluminum
Page 2 of 6
Aluminum_PP_Other_ECR_Eng_Ody.fm
5. Touch the timer icon.
Touch
OK.
A 30-second reaction
period will begin.
6. After 30 seconds add
the contents of one
Hexamethylene-
tetramine Buffer Reagent
powder pillow for 20-mL
sample size.
7. Stopper and invert to
mix until the powder is
dissolved.
A red-orange color will
develop if aluminum is
present.
8. Put one drop of ECR
Masking Reagent
Solution into a clean,
round sample cell. (This
is the blank.)
9. Pour 10 mL from the
mixing cylinder into the
sample cell with the ECR
Masking Reagent (the
blank). Cap and invert to
mix.
The solution will begin to
turn yellow.
10. Fill a second round
sample cell to the 10-mL
mark with the remaining
solution in the cylinder.
(This is the prepared
sample.)
11. Touch the timer icon.
Touch
OK.
A 5-minute reaction
period will begin.
12. Within five minutes
after the timer beeps,
wipe the blank and place
it into the cell holder.
10 mL