This document describes the analysis of BTEX in natural water using SPME technique. BTEX are monocyclic aromatic hydrocarbons with moderate solubility. They are constituents of mineral oil products and widely used as solvents in industrial processes. Additionally, they are major water-soluble constituents of petroleum derivatives (gasoline). The author used GC with FID for analysis and provided detailed information on the instrumentation and conditions.
The document describes a method for analyzing BTEX compounds in water samples. It specifies the use of an Agilent 1093 on-column injector equipped with a 75 um Carboxen/PDMS fiber and a CP-Sil5CB column. The procedure involves headspace extraction to improve sensitivity, followed by injection into a GC-FID system.
The minimum detection limit for benzene is 0.056 ng/L.
It is not necessary to preserve the samples by adding acid.