Hach POCKET COLORIMETER II Instruction Manual page 35

Analysis systems, sulfate (so4), silica (sio2)
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7.
Cover the blank with
the instrument cap.
8.
Press
ZERO/SCROLL
The display will show
"- - -" then "0".
Remove the blank from
the cell holder.
1—35
Sulfate,
9.
.
Within 5 minutes after
the reaction period ends,
place the prepared sample
in the cell holder.
continued

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