BTEX Standard Back Catalog number: 92975 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended DF-IS-I Mass-Labelled PCDF Internal Standard Solution, 1.2ml, nonane Price on request 71238 n-Octylcyclohexane Price on request L-PFHPS Sodium perfluoro-1-heptanesulfonate, 1.2ml x 50ug/ml, methanol Price on request