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环境化学  2015 

祁连山“七一”冰川及其周边地区粉尘中脂肪酸的组成及其来源

Keywords: 七一冰川,脂肪酸,粉尘

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Abstract:

研究了祁连山"七一"冰川冰雪不溶微粒、冰尘以及"七一"冰川附近表层土壤样品中脂肪酸的类型和分布特征,并探讨了这些介质中脂肪酸的来源.结果表明脂肪酸碳数分布为C14—C28,以一元低碳数脂肪酸占优势,高碳数脂肪酸的相对含量不高.脂肪酸偶碳优势指数(CPIA)范围介于2.75—31.86,nC20-/nC20+比值介于2.07—18.48,具有明显的偶碳优势.除冰尘样品dust-9和dust-11主峰碳为C183外,其它样品的主峰碳均为C160,说明本区脂肪酸可能主要以细菌微生物和藻类为主要来源,光化学反应和机动车尾气排放的贡献很少.冰尘中C16和C18不饱和脂肪酸以及C140含量都很高,反映了冰尘与冰雪不溶微粒和冰川附近表层土壤化学环境的不同.

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