کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9694053 | 1459638 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Influence of alkaline extraction on the characteristics of humic substances in Brazilian soils
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
جریان سیال و فرایندهای انتقال
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
An investigation was made of the influence of alkaline extraction on the characteristics of humic substances extracted from Brazilian soil samples. Humic substances (HS) from seven different soils samples collected in Brazil were extracted using the procedure recommended by the International Humic Substances Society (IHSS). Soils, HS and humins were characterized by thermogravimetry and differential thermal analysis. About 8 mg of each material (soil, HS and humin) were placed in a platinum crucible and heated continuously from 20 to 750 °C at a heating rate of 10 °C minâ1 in an atmosphere of synthetic air (100 ml minâ1). A thermal analysis revealed a difference between the content and structural characteristics of organic matter present in HS and humin fractions in relation to their soils. The results indicated that alkaline extraction alters the characteristics of humic substances during the extraction process, underlining the importance of developing methodologies and analytical procedures that allow organic matter in soils to be studied without extracting it.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 77-82
Journal: Thermochimica Acta - Volume 433, Issues 1â2, 1 August 2005, Pages 77-82
نویسندگان
André Henrique Rosa, Luciana Camargo de Oliveira, Iramaia Corrêa Bellin, Julio Cesar Rocha, Luciane Pimenta Cruz Romão, Newton Luiz Dias Filho,