PAH calibration standards, including five types of isotopically labeled internal standards and 16 types of PAHs, were used for quantification. The PAH mix (2000 µg/mL) was purchased from Supelco and included acenaphthene, dibenz[a,h]anthracene, anthracene, chrysene, benz[a]anthracene, benzo[b]fluoranthene, fluorene, benzo[k]fluoranthene, naphthalene, benzo[a]pyrene, phenanthrene, benzo[ghi]perylene, pyrene, fluoranthene, acenaphthylene, and indeno [1,2,3-cd]pyrene. The internal standards (2000 µg/mL) were also purchased from Supelco and included benz[a]anthracene-d12 solution, chrysene-d12 solution, naphthalene-d8 solution, perylene-d12 solution, and phenanthrene-d10 solution.
Five-point standard calibration solutions were prepared to ensure the accuracy and precision of the PAHs for quantitative and qualitative analysis. The standard calibration solutions were measured at levels ranging from 1.25 to 25 µg/mL and internal standards of 10 µg/mL. Each analytical series included one blank test. The 16 PAHs and five internal standards in the samples were defined by the precursor ions and retention time, as shown inTable 1 .
Five-point standard calibration solutions were prepared to ensure the accuracy and precision of the PAHs for quantitative and qualitative analysis. The standard calibration solutions were measured at levels ranging from 1.25 to 25 µg/mL and internal standards of 10 µg/mL. Each analytical series included one blank test. The 16 PAHs and five internal standards in the samples were defined by the precursor ions and retention time, as shown in