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عنوان فارسی مقاله:
مطالعه کمومتری: روش تجزیه و تحلیل تزریق جریان خودکار برای تعیین مقدار اسید هیومیک در زغال سنگ قهوه ای ایلگین
عنوان انگلیسی مقاله:
A chemometric study: Automated flow injection analysis method for the quantitative determination of humic acid in Ilgın lignite
سال انتشار : 2014
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مقدمه انگلیسی مقاله:
1. Introduction
Turkey has substantial reserves of lignite; because of this, the Turkish energy system is based on lignite exploitation. However, high ash and high sulfur content limit the use of these coals for economical practice and in power generation cause serious environmental problems (Akgun et al., 1989; Karaca et al., 1997; Lin et al., 1997). For these reasons, great interest has grown in the possible alternative use of lignites as a source of soil amendments in order to maintain and increase the content of natural organic matter (NOM) of the soil (Schobert, 1995; Peuravuori et al., 2006). Humic substances (HSs) are the most dominant fraction of NOM in the soil. HSs are a series of different molecular weight, light-brown to black-colored complexes and heterogeneous organic polymers formed by secondary synthesis reactions (Stevenson, 1982). These substances can be classified into three main fractions based on their solubilities in alkaline and acidic extraction solutions. Humic acid (HA) fraction is soluble in alkaline solutions but insoluble in acidic solutions; fulvic acid (FA) fraction is soluble in both alkaline and acidic solutions; while humin is insoluble in both solutions (Stevenson, 1982; Schnitzer, 1982). Among these, the predominant fraction is HA, which is very active in interacting with organic and inorganic chemicals as compared to other fractions (Kishi, 1988; Senesi, 1993). This substance plays an important role in soil conservation, for water-holding capacity, and for the complexation of metals in terrestrial and aquatic systems (Swift, 1996; Hayes and Malcolm, 2001; Hayes and Graham, 2000).
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