Shimadzu: Headspace-GC-MS / MS method for volatile organic compounds in water

Volatile organic compounds (VOCs) in environmental water and tap water are usually analyzed by headspace-GC / MS or purge and trap-GC / MS. Since most volatile organic compounds are difficult to dissolve in water and are volatile, samples should be analyzed as soon as possible after sampling. Sample preparation time should be as short as possible to ensure minimum loss of analyte. In addition, the analysis time of a single sample should be shortened as much as possible to ensure that a large number of samples can be analyzed within the storage period to prevent the measurement results from being low due to component volatilization.

The use of short, thin capillary columns can significantly reduce the analysis time while ensuring resolution. However, the use of short columns will increase the co-elution of certain substances and the background interference of the environmental matrix, which may affect the qualitative and quantitative determination of low-concentration targets. Using triple quadrupole mass spectrometry GC / MS / MS, its multiple reaction monitoring (MRM) mode can improve the overall sensitivity of the target, while increasing the selectivity of coeluting peaks, or in complex matrices.

This paper studies the analysis conditions of 25 kinds of volatile organic compounds, covering some volatile materials, using static headspace sampling technology, combined with GC / MS / MS MRM mode for qualitative and quantitative analysis. The use of short and thin capillary columns enables the analysis of 8 samples per hour or approximately one sample every 7 minutes. By optimizing the analysis conditions of Shimadzu HS-20 quantitative loop headspace autosampler and Shimadzu GCMS-TQ8030 triple quadrupole mass spectrometer, up to 8 samples per hour can be analyzed. The MRM mode of the triple quadrupole mass spectrometer can achieve high selectivity for co-elution and complex matrices, and can quantitatively determine VOCs in extremely small amounts of 0.1 μg / L.

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