21. Tracked Changes. Ambient air. Standard gravimetric measurement method for the determination of the PM10 or PM2, 5 mass concentration of suspended particulate matter. (5th September 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (154 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
22. Determination of particle size distribution. Electrical sensing zone method. Tunable resistive pulse sensing method Part 2, (22nd September 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (32 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
23. Fine bubble technology. Characterization of fine bubbles. Evaluation of size and concentration indices by laser diffraction method Part 1, (23rd February 2023) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (20 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗