Centre de Recherche Scientifiques et Techniques en Analyses Physico-Chimiques CRAPC, BP 248, Algiers RP, Algeria.
Chemosphere. 2010 Nov;81(7):925-31. doi: 10.1016/j.chemosphere.2010.07.059. Epub 2010 Aug 21.
The organic fraction associated to sands of five localities of Algerian Sahara Desert was characterized with regards to n-alkanes, polynuclear aromatic hydrocarbons (PAH) and mono/dicarboxylic acids. Huge differences were observed among total contents of the three groups in the sands and, within each group, with regard to percent distribution patterns of congeners. Mutagenic nitro-PAH were virtually absent. Organic acids were identified as the most abundant compounds in all samples (up to 4800 ng g(-1) vs. less than 700 of n-alkanes and 22 ng g(-1) of PAH); their presence was overall related to biogenic sources except for the Hassi Messaoud petroleum area, where an important contribution of anthropogenic emission was present. The sand composition at Hassi Messaoud (and, at lesser extent, Tougguort) seemed to indicate that environmental conditions promote there the oxidative decomposition of organics; by contrast, at Laghouat, Hassi Bahbah and Gardaïa oases the deposition involved fresh (non-reacted) air pollutants. The sand composition at the Hassi Messaoud was compared to that of airborne particulates of the industrial district and city. Airborne n-alkanes (≈500 ng m(-3)) and fatty acids (≈15000 ng m(-3)) were very high compared to Algiers city, whilst PAH contents (10-60 ng m(-3)) were typical of polluted areas in winter; similarly, the sands were reach of the two aliphatic groups and relatively poor of PAH.
对来自阿尔及利亚撒哈拉沙漠五个地点的沙子中的有机部分进行了特征描述，主要包括正构烷烃、多环芳烃（PAH）和单/二羧酸。在沙子中，这三组物质的总含量以及每个组内同系物的百分分布模式都存在巨大差异。实际上，致突变硝基多环芳烃不存在。在所有样品中，有机酸被鉴定为最丰富的化合物（高达 4800ng/g，而正构烷烃的含量不到 700ng/g，PAH 的含量为 22ng/g）；它们的存在总体上与生物源有关，除了哈西梅西奥德石油区，在那里存在重要的人为排放源。哈西梅西奥德（以及较小程度上的图古尔特）的沙子成分似乎表明，环境条件促进了有机物的氧化分解；相比之下，在拉格瓦特、哈西巴巴赫和加达伊亚绿洲，沉积涉及到新鲜（未反应）的空气污染物。哈西梅西奥德的沙子成分与工业区域和城市的空气颗粒物进行了比较。空气中的正构烷烃（约 500ng/m3）和脂肪酸（约 15000ng/m3）与阿尔及尔市相比非常高，而 PAH 含量（10-60ng/m3）则是冬季污染地区的典型特征；同样，沙子中这两组脂肪族物质含量丰富，而 PAH 含量相对较低。
