Material: PP columns with PE filter elements. Further attractive products to complete your chromatography laboratory can be found on our Chromatography page! Please note for SiOH: Extremely polar! Adsorbs air humidity. Should be kept well closed and if necessary dried prior to use. Due to its high affinity for polar compounds it should not be conditioned with polar (e.g. methanol) or water containing solvents. SPE polypropylene column CHROMABOND ® Combi-Kit PCB Extraction of PCBs from oil with reference to DIN 51527, part 1 Components CHROMABOND ® SiOH-H 2 SO 4 /SA and CHROMABOND ® SiOH (25 pieces each) SiOH-H 2 SO 4 : H 2 SO 4 -impregnated silica phase for oxidation of accompanying compounds to ionic and/or polar compounds SA: strongly acidic cation exchanger based on silica with benzenesulphonic acid modification for removal of ionic and sulphur containing compounds SiOH: Unmodified, slightly acidic silica gel