Tesis
Determinação de hidrocarbonetos policíclicos aromáticos e seus derivados utilizando cromatografia líquida acoplada à espectrometria de massas
Fecha
2013-08-06Registro en:
GOBO, Luciana Assis. Determination of polycyclic aromatic hydrocarbons and its derivatives using liquid chromatography coupled mass spectrometry. 2013. 101 f. Dissertação (Mestrado em Química) - Universidade Federal de Santa Maria, Santa Maria, 2013.
Autor
Gobo, Luciana Assis
Institución
Resumen
In this study analytical methods using liquid chromatography coupled to mass
spectrometry with atmospheric pressure chemical ionization (LC-APCI-MS) were
developed for the determination of polycyclic aromatic hydrocarbons in asphalt
fractions. Fourteen polycyclic aromatic hydrocarbons (PAHs) 7 nitrogenated
derivatives (NHPAs) and 5 oxygenated derivatives (OHPAs) were determined. These
compounds are characterized by having two or more condensed aromatic rings, they
have mutagenic and carcinogenic activity, and are widely distributed as constituents
of complex mixtures in many environments. APCI interface parameters were
optimized in order to obtain the highest sensitivity for all compounds. The detection
limits of the methods ranged from 0,5 to 346,5 μg L-1 -1 for PAHs, from 0.1 to 57.3
μgL-1 for NHPAs and 0.1 to 6.6 μgL-1 for OHPAs. The limits of quantification were in
the range from 1.7 to 1550 μg L-1 for PAHs, from 4.6 to 191 μg L-1 for NHPAs and
finally 0.3 to 8.9 μg L-1 for OHPAs. The analytical methods developed were applied to
brazilian asphalt samples after their fractionation according to ASTM D4124 and
Green method. The concentration of PAHs in this sample ranged from 0.86 to 647
mg kg-1, and NHPAs were 9.26 to 2146 mg kg-1, the OPAHs were not detected.