Abstract：In order to optimize measurement parameters when using constant energy synchronous luminescence spectrometry to determine benzo[k]fluoranthene in atmospheric aerosols, orthogonal experiments were conducted to study the impact of photomultiplier (PMT) voltage, excitation monochromator slit bandwidth (EX-slit) and emission monochromator slit bandwidth (EM-slit) on the precision, sensitivity, detection limit and half-height peak width. The results showed that all the three factors had significant influence on the precision, sensitivity and detection limit, but only EX-slit had significant impact on half-height peak width. Declining of precision and growing of sensitivity were observed when increasing PMT voltage. Detection limits, however, revealed a complex nonlinearity relationship with PMT voltage and reached their minimums with PMT voltage at 800V. With the enlargement of EX-slit, precisions were improved but half-height peak widths were also increased with lower detection limits and worse sensitivities. With the growing EM-slit, sensitivity was improved but detection limit and precision were declining. Based on the orthogonal tests the optimized measurement parameters included PMT voltage of 800V, EX-slit of 2.5nm and EM-slit of 5nm. The lowest detection limit under these optimized conditions was 0.086ng/mL, which is technically suitable for on-line monitoring of benzo[k]fluoranthene. For benzo[k]fluoranthene in environmental aerosol samples, results measured by constant energy synchronous luminescence spectrometry agreed quite well with those by high performance liquid chromatography equipped with fluorescence detector. The differences between them ranged from 1.73% to 10.70%.
蔡小琼, 王伯光, 刘慧璇. 气溶胶中苯并[k]荧蒽的恒能量同步荧光测量条件优化[J]. 中国环境科学, 2011, 31(8): 1256-1262.
CAI Xiao-Qiong, WANG Bo-Guang, LIU Hui-Xuan. Optimization of parameters for the determination of aerosol benzo[k]fluoranthene by constant energy synchronous luminescence spectrometry. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(8): 1256-1262.
