Hach DR/700 - Page 737

81-63
Method 8186
SILICA, LR (0 to 2.00 mg/L)
For water and seawater
Heteropoly Blue Method*
1. Install module
81.01
in a DR/700.
Note: If samples cannot
be analyzed
immediately, see
Sampling and Storage
following these steps.
2. Press: l/O
The display will show
810 nm
and module number
81.01
3. After 2 seconds,
the display will show
a program number,
concentration units,
decimal position and
the zero prompt. If
necessary, press the
UP ARROW key until
the lower display
shows program
number
81.05.1
*Adapted from Standard Methods for the Examination of Water and Wastewater.