437
Method 8237
TURBIDITY (0 to 1000 FAU) For water, wastewater, and seawater
Absorptometric Method
*
* Adapted from FWPCA Methods for Chemical Analysis of Water and Wastes, 275 (1969)
1. Enter the stored
program number for
turbidity.
Press:
PRGM
The display will show:
PRGM ?
Note:
1 FAU=1 NTU=1 FTU
when measuring formazin.
These are not equivalent
when measuring other
types of standards or
samples.
2. Press: 95 ENTER
The display will show
FAU and the ZERO
icon.
3. Fill a sample cell
with 10 mL of deionized
water (the blank).
Note: Wipe the surface of
the cell with a soft cloth.
Note: For highly colored
samples, use a filtered
portion of sample in place
of the deionized water.
4. Place the blank into
the cell holder. Tightly
cover the sample cell with
the instrument cap.
5. Press: ZERO
The cursor will move to
the right, then the
display will show:
0 FAU
6. Fill another sample
cell with 10 mL of
sample.
Note: Mix the sample well
before transferring it to the
sample cell.
Note: Wipe the surface of
the cell with a soft cloth.
7. Place the sample cell
into the cell holder.
Tightly cover the sample
cell with the
instrument cap.
8. Press: READ
The cursor will move to
the right, then the result
in Formazin Attenuation
Units (FAU) will be
displayed.
Note: Standard Adjust may
be performed using a
prepared standard (see
Section I).
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