Molecular Size Distribution and Shape of Humic Substance and Ferrihydrite Coprecipitated Complexes
To compare the interaction between humic substances (HS) and ferrihydrite during coprecipitation,we prepared five ferrihydrite-HS complexes through coprecipitation using a leonardite.The reaction products were studied by Transmission Electron Microscopy (TEM) and Dynamic Light Scattering (DLS) analysis.DLS data of unfiltered samples showed a bimodal size distribution,with a prevalent presence (62%) of very large particles (average size of 255 nm with a standard deviation of 272 nm) and 38% of smaller particles with 85 nm of size (standard deviation of 14 nm).The TEM images showed an irregular subangular macroparticles with colloidal structure,with rough or irregular surfaces rounded by very small particles.Indeed,most of the rounded and angular particles could be small ferrihydrite aggregates that are also observed as discrete particle association.The smooth surfaces of the ound and angular particles suggested that they were poorly crystalline Fe phases.The TEM results coincided with DLS analysis that the complexes were a woven network ofmicelles structure.
Ferrihydrite Humic substances Molecular structure Dynamic light scattering (DLS)
Claudio Colombo Giuseppe Palumbo Ruggero R.Angelico Andrea Ceglie Jizheng He
Dipartimento di Scienze Animali Vegetali e dellAmbiente,Università del Molise,V.De Sanctis,Campobas Consorzio per lo sviluppo dei Sistemi a Grande Interfase(CSGI)c/o Università del Molise(DISTAAM),v.D Research Centre for Eco-environmental Sciences,Chinese Academy of Sciences,18 Shuangqing Road,Beijin
国际会议
the 16th Meeting of the International Humic Substances Society (第十六届国际腐殖物质学会大会(IHSS 16))
杭州
英文
108-110
2012-09-09（万方平台首次上网日期，不代表论文的发表时间）