Table of Contents
Advertisement
HARDNESS,
continued
9.
Place the blank into
the cell holder. Tightly
cover the sample cell with
the instrument cap.
13.
Without removing
the cell, press:
PRGM 29 ENTER
The display will show:
PRGM ?
Note: For alternate forms
(Ca) press the CONC key.
Sampling and Storage
10.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L CaCO3
Note: If Reagent Blank
Correction is on, the
display may flash "limit".
See Section 1.
14.
Press:
ZERO
The cursor will move to
the right, then the
display will show:
0.00 mg/L CaCO3
Collect samples in acid-washed plastic bottles. Adjust the sample
pH to 2 or less with nitric acid (about 5 mL per liter). Preserved
samples can be stored up to six months. Adjust the sample pH to
11.
Place the prepared
sample into the cell
holder. Tightly cover the
sample cell with the
instrument cap.
15.
Place the third
sample cell into the
cell holder.
186
12.
Press:
READ
The cursor will move to
the right, then the result
in mg/L magnesium
hardness (as CaCO
)
3
will be displayed.
16.
Press:
READ
The cursor will move to
the right, then the result
in mg/L calcium
hardness (as CaCO
)
3
will be displayed.
Note: Standard Adjust may
be performed using a
prepared standard (see
Section 1).
Note: mg/L total hardness
= mg/L Ca as CaCO
+
3
mg/L Mg as CaCO
.
3
Hide quick links:
Advertisement
Table of Contents
