稻草及其燃烧烟尘中正构烷烃的研究

利用气质联用仪测定了中国6种稻草及其明火和闷火燃烧烟尘中正构烷烃的含量.结果表明,稻草中正构烷烃的平均含量为73.0μg/g.碳数分布范围为C12~C37,呈以C29为主峰的单峰型分布.高碳数正构烷烃(>C23)具有明显的奇碳数优势,其平均碳优势指数是2.9.在明火焚烧和闷烧烟尘中正构烷烃的含量均值分别是 1633.1,5458.5μg/g.碳数分布范围为C14~C35,呈以C29或C31为主峰的单峰型分布.碳数在C27以上的正构烷烃具有明显的奇碳数优势,其平均碳优势指数分别是1.5和1.9.稻草烟尘中正构烷烃的组成与原秸秆存在显著的差别.

n-Alkanes in rice straw and the burning smoke

n-Alkanes were measured by GC-MS in six types of rice straw grown in China and the smoke generated in flaming and smoldering conditions. The mean content of n-Alkanes in the straw was 73.0μg/g, and the carbon number ranged from C12 to C37, exhibiting the distribution with only one peak at C29. Besides, it had an obvious odd to even carbon number predominance for C23 to C37, and the mean CPI value was 2.9. However, the average n-alkane contents were 1633.1 and 5458.5μg/g in flaming and smoldering smoke, respectively. The carbon number varied from C14 to C35, and showed a single peak distribution at C29 or C31. In addition, the odd to even carbon number predominance was shown for C27 to C35, and the average CPI values were 1.5 and 1.9, respectively. Prominent distinction exists between the composition of n-Alkanes in the rice straw and the smoke.