Method : 8006
For water and wastewater
Photometric Method* (Also called Nonfilterable Residue)
1. Enter the stored program number for suspended solids.
Press: PRGM
The display will show:
PRGM ?
2. Press: 94 ENTER
The display will show mg/L, SuSld and the ZERO icon.
3. Blend 500 mL of sample in a blender at high speed for exactly 2 minutes.
4. Pour the blended sample into a 600-mL beaker.
5. Fill a sample cell with 25 mL of tap water or deionized water (the blank).
Note: Remove gas bubbles in the water by swirling or tapping the bottom of the cell on a table.
6. Place the blank in the cell holder. Tightly cover the sample cell with the instrument cap.
7. Press: ZERO
The cursor will move to the right, then the display will show:
0 mg/L SuSld
8. Stir the sample thoroughly and immediately pour 25 mL of the blended sample into a sample cell (the prepared sample).
9. Swirl the prepared sample cell to remove any gas bubbles and uniformly suspend any residue.
10. Place the prepared sample into the cell holder.
Tightly cover the sample cell with the instrument cap.
11. Press: READ
The cursor will move to the right, then the result in mg/L suspended solids will be displayed.
Only available for 0-750 mg/L concentration of suspended solid.
Sample Dilution Techniques
10 mL and 25 mL are the volumes used for most colorimetric tests.
However, in some tests, the color developed in the sample may be too intense to be measured.
Unexpected colors may develop in other tests.
In both cases, dilute the sample to determine if interfering substances are present.
To dilute the sample easily, pipet the chosen sample portion into a clean graduated cylinder (or volumetric flask for more accurate work).
Fill the cylinder (or flask) to the desired volume with deionized water.
Mix well.
Use the diluted sample when running the test.
The concentration of the sample is equal to the diluted sample reading multiplied by the multiplication factor.
More accurate dilutions can be done with a pipet and a 100-mL volumetric flask.
Pipet the sample and dilute to volume with deionized water.
Swirl to mix.
Sampling and Storage
> Collect samples in clean plastic or glass bottles.
> Analyze samples as soon as possible after collection.
> The sample may be stored seven days by cooling to 4 °C (39 °F).
Method Performance
Precision
In a single laboratory, using a standard solution of 847.4 mg/L Suspended Solids with the instrument, a single operator obtained a standard deviation of ±18.2 mg/L Suspended Solids.
For more information on Hach’s precision statement, see Section 1.
Estimated Detection Limit
The estimated detection limit for program 94 is 22.1 mg/L Suspended Solids.
For more information on
For water and wastewater
Photometric Method* (Also called Nonfilterable Residue)
1. Enter the stored program number for suspended solids.
Press: PRGM
The display will show:
PRGM ?
2. Press: 94 ENTER
The display will show mg/L, SuSld and the ZERO icon.
3. Blend 500 mL of sample in a blender at high speed for exactly 2 minutes.
4. Pour the blended sample into a 600-mL beaker.
5. Fill a sample cell with 25 mL of tap water or deionized water (the blank).
Note: Remove gas bubbles in the water by swirling or tapping the bottom of the cell on a table.
6. Place the blank in the cell holder. Tightly cover the sample cell with the instrument cap.
7. Press: ZERO
The cursor will move to the right, then the display will show:
0 mg/L SuSld
8. Stir the sample thoroughly and immediately pour 25 mL of the blended sample into a sample cell (the prepared sample).
9. Swirl the prepared sample cell to remove any gas bubbles and uniformly suspend any residue.
10. Place the prepared sample into the cell holder.
Tightly cover the sample cell with the instrument cap.
11. Press: READ
The cursor will move to the right, then the result in mg/L suspended solids will be displayed.
Only available for 0-750 mg/L concentration of suspended solid.
Sample Dilution Techniques
10 mL and 25 mL are the volumes used for most colorimetric tests.
However, in some tests, the color developed in the sample may be too intense to be measured.
Unexpected colors may develop in other tests.
In both cases, dilute the sample to determine if interfering substances are present.
To dilute the sample easily, pipet the chosen sample portion into a clean graduated cylinder (or volumetric flask for more accurate work).
Fill the cylinder (or flask) to the desired volume with deionized water.
Mix well.
Use the diluted sample when running the test.
The concentration of the sample is equal to the diluted sample reading multiplied by the multiplication factor.
More accurate dilutions can be done with a pipet and a 100-mL volumetric flask.
Pipet the sample and dilute to volume with deionized water.
Swirl to mix.
Sampling and Storage
> Collect samples in clean plastic or glass bottles.
> Analyze samples as soon as possible after collection.
> The sample may be stored seven days by cooling to 4 °C (39 °F).
Method Performance
Precision
In a single laboratory, using a standard solution of 847.4 mg/L Suspended Solids with the instrument, a single operator obtained a standard deviation of ±18.2 mg/L Suspended Solids.
For more information on Hach’s precision statement, see Section 1.
Estimated Detection Limit
The estimated detection limit for program 94 is 22.1 mg/L Suspended Solids.
For more information on
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