18
MD100_4 10/2014
GB
Methods
RESULT
Suspended Solids
0 – 750 mg/l TSS
Sample preparation:
Blend approx. 500 ml of the water sample in a blender at high speed
for 2 minutes.
Fill a clean vial (24 mm Ø) with
10 ml of deionised water
, close
tightly with the cap.
Place the vial in the sample chamber making sure that the marks
are aligned.
Press [Zero/Test] key.
The method symbol flashes for approx. 8 seconds.
The display shows:
Remove the vial from the sample chamber and empty the vial com-
pletely.
Stir the blended water sample. Immediately rinse the vial with the water
sample and fill with
10 ml water sample
.
Close the vial tightly with the cap.
Place the vial in the sample chamber making sure that the marks
are aligned.
Press the [ZERO/TEST] key.
The method symbol flashes for approx. 3 seconds.
The result is shown in the display in mg/l TSS (Total Suspended
Solids).
Tolerance:
± 10% (full scale)
0.0.0
SuS
Zero
Test
SuS
Note:
The photometric determination of Suspended Solids is based on a gravimetric method.
1.
In a lab this is usually done by evaporation of the filter residue of a filtrated water sample
in an oven at 103°C – 105°C and weighing of the dried residue.
When higher accuracy is required perform a gravimetric determination of a water sam-
2.
ple. The result can be used to calibrate the photometer with the same water sample.
The estimated detection limit is 20 mg/L TSS.
3.
Collect water samples in clean plastic or glass bottles and analyse the water sample as
4.
soon as possible. It is possible to store the sample at 4°C for 7 days. Before measure-
ment warm up the sample to the temperature at collection time.
Interferences:
5.
• Air bubbles interfere and can be removed by swirling the vial gently.
• Colour interferes if light is absorbed at 660 nm.
Zero
Test
SuS
