| 古水稻土中多环芳烃的分布特征及其来源判定 |
| 摘要点击 2157 全文点击 1861 投稿时间：2005-07-13 修订日期：2005-09-09 |
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| 中文关键词 古水稻土 多环芳烃 来源 稻草焚烧 生物合成 |
| 英文关键词 ancient paddy soil PAHs sources rice straw burning biogenesis |
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| 中文摘要 |
| 测定了马家浜文化(距今约6 000a)遗址2个剖面表层土壤、古代水稻土和古代旱地土壤、以及底层土壤中15种多环芳烃的含量,并对其可能来源进行了判定.结果表明,表层土壤中PAHs的含量分别为202.9μg·kg-1和207.7μg·kg-1,主要来源于大气沉降;古水稻土中PAHs含量明显降低,仅为56.0μg·kg-1,但高于古旱地土壤及底层土壤。古旱地土壤及底层土壤PAHs含量在32.0～36.9μg·kg-1.古水稻土中,2环和3环所占比例较大,达63%,萘和菲含量最高,而4环以上的多环芳烃含量较低.Phe/Ant和BaA/Chr比值和有机质13C-NMR图谱显示,古水稻土中的多环芳烃主要来源于水稻秸秆的焚烧,同时还原条件下的生物合成可能是其另一个重要来源. |
| 英文摘要 |
| Soil samples of current paddy soils,ancient paddy soil/ancient dry land soil,and bottom soils were collected from two sites in Chuodunshan Site of Majiabang Culture(about 6 000a).15 polycyclic aromatic hydrocarbons(PAHs) were analyzed with HPLC,and their possible sources were identified.The sum of 15 PAHs was 202.9μg·kg-1 and 207.7μg·kg-1 in the surface soils from Site A and Site B respectively,which were mainly deposited from atmosphere.In ancient paddy soil from Site A,the total PAHs concentration sharply decreased to 56.0μg·kg-1,but was still higher than those in ancient dry land soil and bottom soils with the sum of 32.0～36.9μg·kg-1.In ancient paddy soil,the concentrations of 2-ring and 3-ring PAHs took a larger portion of 63 percents to the total PAHs,and naphthalene and phenanthrene were the most abundant compounds,while PAHs of more than 4 rings took a small part.The ratios of phenanthrene anthracene and benzo(a)anthracene chrysene and(13C-NMR) spectrum of soil organic matter showed that PAHs in ancient paddy soil mainly originated from rice straw burning,biogenesis under reducing conditions may be another source. |
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