The analyst may be better equipped to choose between GC and HPLC Packed GC columns are described in the 610 method, but chromatographic conditions can be changed (e.g., capillary columns may be used) if the changes do not make the method less accurate or less precise than the standard method EPA 610-N PAH kit contains 16 individually packaged polynuclear aromatic hydrocarbon neats for customizing solutions to meet the unique needs of the laboratory Each PAH has been tested by GC for purity