Determination of SVOCs in KH Samples

Gas chromatography-mass spectrometry (GC/MS) was used for SVOC determination on the KH sample based on modifications to the U.S. E.P.A. 8270 protocol [32 (link)]. The KH samples were extracted with 99.8% dichloromethane (GC grade, Merck, Darmstadt, Germany) before concentrating on the minimum injection volume. The sample was injected into the splitless inlet of an Agilent 7890B, 5977B MSD GC-MS system (Agilent Technologies, Santa Clara, CA, USA). The carrier gas, helium, flowed at a 1.0 mL/min rate. The peaks collected were compared with those in the NIST collection to identify the SVOCs (Gaithersburg, MD, USA). Table 2 lists the GC and MS running circumstances.