Suspended matter, SPM

Last changed: 24 September 2020

Closely related analytical methods that also estimate the amount of particles in the water are turbidity and the difference between absorbance on unfiltered and filtered water.

Known issues in the databases

During 2019 it was discovered that an erroneous reporting limit had been entered to the laboratory data system when the Soil and Environment method was introduced. The limit had been set to 1 mg/l instead of 10 mg/l. The error was corrected and all results from 2019 were reported with the correct reporting limit. Old data have been recalculated in the database but in result files sent out before 2019 values below 10 mg/l should be changed to < 10 mg/l. 

Current method of measurement

The Aquatic Sciences and Assessment Method

Valid since January 2007
Method: SS-EN 872:2005 (modified). The amount of suspended material is determined gravimetrically after extraction by suction filtering through a 1.2 µm glass fibre filter.

The Soil and Environment Method

Valid since July 2020
Method: Internal method. The samples are filtered through a membrane filter with 0,22 µm pore width.

Previous methods

The Aquatic Sciences and Assessment Method

2004-01  – 2006-12
Method: SS-EN 872 1st ed. The amount of suspended material is determined gravimetrically after extraction by suction filtering through a 1.2 µm glass fibre filter.

1967-01 – 2003-12
Method: Zachrisson, G. SMHI, 1966. Slamhalts- och glödgningsrestbestämning vid HBF (Suspended material content and ignition loss determination at HBF, in Swedish). Swedish Standard SS 02 81 13 (modified).

The Soil and Environment Method

2014-01  – 2020-06
Method: Internal method. The samples are filtered through a membrane filter with 0,20 µm pore width.


Contact
Page editor: Lars.Sonesten@slu.se