کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4411107 1307578 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Organic components of Algerian desert dusts
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Organic components of Algerian desert dusts
چکیده انگلیسی

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 (≈15 000 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 81, Issue 7, November 2010, Pages 925–931
نویسندگان
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