Hach DR/700 - Page 739

81-65
SILICA, LR, continued
10. Press: ZERO
The display will
count down to 0.
Then the display will
show 0.000 mg/L and
the zero prompt will
turn off.
11. Add the
contents of one
Amino Acid F
Reagent Powder
Pillow to the cell.
This is the prepared
sample. Cap and
invert several times to
mix.
Note: A blue color will
develop if silica is
present.
12. Wait 1 minute.
13. Place the
prepared sample in
the cell holder.
Note: In bright sunlight
it may be necessary to
close the cell
compartment cover.
14. Press: READ
The display will
count down 0. Then
the display will show
the results in mg/L
silica (SiO
2
).
1 minute