Al-Ferron逐时络合比色法研究PACS中铝的水解聚合形态

制备了碱化度(B)及不同Al~(3+)/SO_4~(2-)摩尔比的系列PACS,用Al-Ferron逐时络合比色法研究了铝的形态分布,考察了碱化度(B)、Al~(3+)/SO_4~(2-)摩尔比、稀释作用及pH值对铝的形态分布的影响.实验结果表明,Al~(3+)/SO_4~(2-)摩尔比及溶液的pH值对铝的形态分布有较大的影响,稀释作用对铝的形态分布影响较小.Al~(3+)/SO_4~(2-)摩尔比愈小,pH值愈高,铝的水解聚合大分子及胶体粒子所占的比例就愈大.

STUDY ON THE ALUMINUM SPECIES OF PACS BY USING Al-FERRON TIMED COMPLEX COLORIMETRIC METHOD

A series of polyaluminum chlorides containing sulfate ion (PACS),which have different basicities and A13+/SO42- molar ratio, were prepared. The aluminum species of PACS resulted from hydrolysis-polymerization processes were studied by using Al-Fer-ron timed complex colorimetric method. The effects of basicities,A13+/SO42- molar ratio, dilution and pH value on the aluminum species were also investigated. The experimental results show that Al3+/SO42-molar ratio and pH value have a great effect on the aluminum species ;dilution has a small effect on the aluminum species. The lower the molar ratio of A13+/SO42- and the higher the pH value,the more the proportions of aluminum large polymers and the colloidal particles of aluminum.