SUPELCOSIL LC-PAH columns were designed specifically for analyses of the priority pollutant PAHs listed in US EPA Method 610. 2.1 mm and 3.0 mm columns save solvent and improve sensitivity when sample mass is limited. 3 µm columns provide extremely rapid, highly efficient analyses, while retaining the durability of porous silicas. They are excellent and economical substitutes for 1.5 µm nonporous silicas.. Particle Size: 5 µm. Pore Size: 120 Å. Sold in each. . . Sigma-Aldrich 58318 SUPELCOSIL LC-PAH HPLC Column, 5 µm Particle Size, 4.6mm ID, 15cm Length. Country of Origin : United States. Part Number : 1186U67EA. Pack of : 1.