Порівняльна характеристика якісного стану гумусових речовин цілинних грунтів і сільськогосподарських угідь методом десорбційної мас-спектрометрії

• Date: 2012
• Main Authors: Palyanytsya, B. B., Berejnia, M. F., Tonkha, O. L., Laszlo, K., Menihard, A., Toth, A., Dudik, O. O., Cherniavska, T. V., Kulik, T. V.
• Format: Article
• Language: Russian
• Published: Chuiko Institute of Surface Chemistry National Academy of Sciences of Ukraine 2012
• Online Access: https://surfacezbir.com.ua/index.php/surface/article/view/483
• Journal Title: Surface

Comparative investigation of thermal transformations of lignin and soil samples have been carried out using thermogravimetric and temperature programmed desorption mass spectrometry methods. It has been established that thermal decomposition of lignin proceeds via three main stages. Main stages and products of lignin thermolysis have been identified. The first stage (Tmax = 300 0C) is attributed to thermal transformations of lignin peripheral polysaccharide fragments. The second stage (Tmax = 335 0C) is associated with desorption of lignin structural elements in the molecular forms as a result of depolymerization processes of phenolpropanoid polymeric blocks of lignin. The third stage (Tmax = 370 0C) correspond to a deeper decomposition of lignin and characterized by desorption of smaller structural fragments in molecular forms (m/z = 110, pyrocatechol). Pressure – temperature curves of thermolysis of soil samples have been analyzed. Main products and stages of thermolysis of soil are identified. It’s interesting fact, that mass spectra of the investigated soils from virgin and agricultural lands, as well as soil samples with different horizon depth, are identical qualitatively.