Suspended Solids
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 2 of 2 SuspendedSolids_None_Other_PHO_Eng_Ody.fm
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Interferences
Samples that absorb strongly at 810 nm, such as blue dyes, may give false, high-
bias readings. A user-entered calibration is advised for these samples.
Calibration for this test is based on parallel samples using the gravimetric
technique on sewage samples from a municipal sewage plant. For most samples,
this calibration will provide satisfactory results. When higher accuracy is
required, run parallel spectrophotometric and gravimetric determinations with
portions of the same sample. The new calibration should be made on your
particular sample using a gravimetric technique as a basis.
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).
Summary of Method
This method of determining suspended solids is a simple, direct measurement
which does not require the filtration or ignition/weighing steps that gravimetric
procedures do. The USEPA specifies the gravimetric method for solids
determinations, while this method is often used for checking in-plant processes.
Test results are measured at 810 nm.
Required Apparatus
Quantity Required
Description Per Test Unit Cat. No.
Beaker, 600-mL, poly................................................................................1 ....................... each......................1080-52
Blender, 1.2-L, 120 VAC ...........................................................................1 ....................... each....................26161-00
Blender, 1.2-L, 240 VAC ...........................................................................1 ....................... each....................26161-02
Cylinder, graduated, 500-mL, poly ........................................................1 ....................... each......................1081-49
Pipet, serologic, 25-mL.............................................................................1 ....................... each......................2066-40
Pipet, Filler, safety bulb ...........................................................................1 ....................... each....................14651-00
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
9. Place the prepared sample into the cell holder.
10 mL
20 mL
25 mL
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