Evaluation of behavioral differences between native polycyclic aromatic hydrocarbons and (13)C-labeled internal standards during clean-up steps of analysis.
We confirmed that concentrations of polycyclic aromatic hydrocarbons (PAHs) obtained by isotope dilution mass spectrometry (IDMS) using the corresponding (13)C-labeled internal standards are reliable even after clean-up steps. Change in the ratio of phenanthrene to (13)C(6)-phenanthrene was less than 0.2%, although the recovery yield of (13)C(6)-phenanthrene decreased to 60%. Since changes in the ratios were commonly within the relative standard deviations of the concentrations (1.5 - 5.4%) obtained using gas chromatography-mass spectrometry in combination with pressurized-liquid extraction, concentrations obtained by IDMS with (13)C-PAHs should be reliable.
Itoh
Nobuyasu
N
National Metrology Institute of Japan (NMIJ), Japan. nobuyasu-itoh@aist.go.jp
Numata
Masahiko
M
Yarita
Takashi
T