Hach DR/700 - Page 215

45-43
POTASSIUM, continued
10. Pour the
solutions from each
cylinder into separate
25-mL sample cells.
Cap each cell.
11. Place the treated
standard in the cell
holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
light, it may be
necessary to close the
cell compartment cover.
Transfer 10 mL of the
treated standard
solution to a 10-mL cell.
If the 10-mL cell is used
for the treated standard,
another
10-mL cell must be used
for the prepared sample.
12. Press: ZERO
The display will
count down to 0.
Then the display will
show the
concentration of the
standard and the zero
prompt will turn off.