Monitoring particulate fouling of North Sea water with SDI and new ASTM MFI0.45 test

Sergio G. Salinas Rodriguez*, Nizordinah Sithole, Nirajan Dhakal, Margot Olive, Jan C. Schippers, Maria D. Kennedy

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

5 Citations (Scopus)
118 Downloads (Pure)


For assessing the particulate fouling of water, the modified fouling index (MFI0.45) is a superior test to the silt density index (SDI). There is a need to compare both tests in terms of sensitivity, how they are affected by the filter material and the type of support plate and also illustrate their use for monitoring of seawater quality over time. In this work, we studied seven different filter holders with different filter support plates and three different 0.45 μm filter materials, and we applied the tests for monitoring of North Sea water quality. The results illustrated that the type of support plate of the filter holder greatly influences the measured MFI0.45 values and thus, a correction for the effective membrane area may be needed when carrying out an MFI0.45 test. An attempt to normalize differences in MFI0.45 due to filter material with a Formazin solution was tested but proven not successful. When monitoring the seawater, the MFI0.45 was much more sensitive than SDI to water quality variations in particular during algal growth. As the SDI and MFI0.45 tests can be measured with help of the same equipment, more alignment in the ASTM protocols for both methods is recommended.
Original languageEnglish
Pages (from-to)10-19
Number of pages10
Publication statusPublished - 2019


  • MFI
  • Particulate fouling
  • SDI
  • Seawater


Dive into the research topics of 'Monitoring particulate fouling of North Sea water with SDI and new ASTM MFI0.45 test'. Together they form a unique fingerprint.

Cite this