Aspects of Protonation and Deprotonation of Humic Acid Surface on Molecular Conformation

Alexandre G. S. Prado; Jonas Pertusatti; Alecio R. Nunes

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Aspects of Protonation and Deprotonation of Humic Acid Surface on Molecular Conformation

机译：腐植酸表面质子化和去质子化的分子构象

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As densidades superficiais de carga de acidos humicos foram determinadas por titulacao potenciometrica e condutimetrica simultaneas. Tambem foi observada a influência do pH na conformacao molecular atraves de espectroscopia de UV-Vis e microscopia eletronica de varredura (MEV). A densidade de carga superficial para todas as amostras de acido humico e aproximadamente zero na faixa de pH 3,5-6,0. A influencia do pH na condensacao molecular foi observada pela determinacao do indice b na equacao de Doty e Steiner. Os altos valores de b foram obtidos na regiao acida, indicando uma conformacao condensada, devido a fraca interacao atrativa. Alem disso, na regiao alcalina, a densidade de carga na superficie da molecula e mais negativa, o que favorece o aumento da repulsao e dispersao das particulas, levando a formacao de estruturas micelares como consequência da caracteristica anfifilica dos acidos humicos.

机译：通过同时电位滴定法和电导滴定法测定腐殖酸负载量的表面密度。还通过UV-Vis光谱和扫描电子显微镜（SEM）观察到pH对分子构象的影响。在pH值3.5-6.0范围内，所有腐殖酸样品的表面电荷密度约为零。通过确定Doty和Steiner方程中的指数b可以观察到pH对分子缩合的影响。由于弱的吸引力相互作用，在酸性区域获得了较高的b值，表明其构象缩合。另外，在碱性区域中，分子表面上的电荷密度更负，这有利于增加颗粒的排斥和分散，由于腐殖酸的两亲特性导致形成胶束结构。

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《Journal of the Brazilian Chemical Society》 |2011年第8期|共6页
作者
Alexandre G. S. Prado; Jonas Pertusatti; Alecio R. Nunes;
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正文语种 eng
中图分类化学;
关键词
Protonation; Deprotonation; Conformation;

机译：质子化;去质子化;构象;

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1. Aspects of Protonation and Deprotonation of Humic Acid Surface on Molecular Conformation [J] . Alexandre G. S. Prado, Jonas Pertusatti, Alecio R. Nunes Journal of the Brazilian Chemical Society . 2011,第8期

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Aspects of Protonation and Deprotonation of Humic Acid Surface on Molecular Conformation

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