Methods; Suspended Solids; Sample Preparation - Lovibond MD100 Mode D'emploi

Methods

GB
SuS
Zero
Test
SuS
0.0.0
Zero
Test
SuS
RESULT
Note:
1. The photometric determination of Suspended Solids is based on a gravimetric method.
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.
2. When higher accuracy is required perform a gravimetric determination of a water sam-
ple. The result can be used to calibrate the photometer with the same water sample.
3. The estimated detection limit is 20 mg/L TSS.
4. Collect water samples in clean plastic or glass bottles and analyse the water sample as
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.
5. Interferences:
• Air bubbles interfere and can be removed by swirling the vial gently.
• Colour interferes if light is absorbed at 660 nm.
18

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
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
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)
marks
marks
MD100_4 10/2014