45-50
SODIUM CHROMATE, continued
7. Place the blank in
the cell holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10-mL of the
blank solution to a
10-mL cell. If the 10-mL
cell is used for the blank,
another 10-mL cell must
be used for the sample.
8. Press: ZERO
The display will
count down to 0.
Then the display will
show 0.00 mg/L and
the zero prompt will
turn off.
9. Place the prepared
sample in the cell
holder.
Note: Typical indoor
lighting permits the
DR/700 to operate with
the cell compartment
cover open. In bright
sunlight, it may be
necessary to close the
cell compartment cover.
Transfer 10-mL of the
blank solution to a
10-mL cell. If the 10-mL
cell is used for the blank,
another 10-mL cell must
be used for the sample.
10. Press: READ
The display will
count down to 0.
Then the display will
show the results in
mg/L sodium
chromate (Na
2
CrO
4
).
Note: See table below to
convert sodium
chromate to other units.
Table 1. Conversion Factors
To convert reading from To Multiply by
mg/L Na
2
CrO
4
CrO
4
2-
0.72
mg/L Na
2
CrO
4
Cr
6+
0.321
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