SPE-Polypropylene column CHROMABOND®, NAN, 3ml vol.,abs. weight 400/1400/400mgSPE Polypropylene column CHROMABOND, NAN, 3ml vol.,abs. weight 400 1400 400mg, Density (D) 2,24 g cm, UN Nr. 3316 Material: PP columns with PE filter elements. Further attractive products to complete your chromatography laboratory can be found on our Chromatographypage! Enrichment of PCBs from sludge Special combination phase: N: sodium sulphate for removal of trace water A: SiOH AgNO3 phase for removal of sulphur, sulphur containing and polar