중급 분해능 질량분석장치를 적용한 환경시료의 다이옥신 측정

Abstract

An middle resolution mass spectrometer (MRMS) with resolving power of approximately 3,000 (10% valley) was applied to the measurement of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) in environmental samples such as sediment, soil and bottom ash. Similar range of relative response factors (RRFs) obtainable in the accredited method but higher relative standard deviations (RSD) were observed by MRMS with resolving power of 1,000. Some of recovery rates using the environmental reference material (RM) significantly exceeded the criteria of quality assurance/quality control (QA/QC), possibly due to the effect of ion suppression by interfering fragments originated from the sample matrices. MRMS was applied to the quantification of RM samples for sediment, soil and bottom ash. The results were compared to those obtained using a high resolution mass spectrometer (HRMS); the same sample preparation procedures were used. Elevated concentrations of each PCDD/F congeners and toxic equivalents were obtained by MRMS: 2 times higher for river sediment and 1.7 times higher for soil and bottom ash than those from the analysis using HRMS. From the result, it was concluded that a MRMS could be used as precautional screening methods for PCDD/Fs of the samples from highly contaminated areas.