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在本研究第二篇中,我们通过实验室模拟研究,发现海水中Fe~(+++)或Al~(+++)离子在适当pH条件下生成Fe(OH)_3或Al(OH)_3胶体沉淀后,对活性硅有相当大的吸附能力;同时还通过吸附热计算、淋洗脱附实验和重溶解实验,判断上述吸附并不是一般可逆的离子交换吸附,而比较可能是化学吸附,吸附后基本上不转化为高聚硅酸结构,而比较可能进行结构重排转入内部结构中去。根据这些结果,我们提出一个关于河口活性硅地球化学转移的理论图象:即活性硅主要通过由于pH和盐度提高而生成的铁、铝等元素氢氧化物胶体沉淀的吸附而转移,再进一步转化为比较稳定的铁、铝的硅酸盐化合物形式,沉积到海底。为了进一步验证这个理论图象的现实性,我们再度在九龙江口进行了一些现场取样分析研究,试图通过河口各处海水悬浮物中各化合形式硅、铁、铝的分布变化资料,加以初步归纳总结,并和理论图象相对照。
In the second part of this research, we found that Fe ~ (+++) or Al ~ (+++) ions in seawater produced Fe (OH) 3 or Al (OH) _3 colloid precipitation, the active silicon has a considerable adsorption capacity; also calculated by the adsorption heat, leaching and desorption experiments and re-dissolution experiments to determine the adsorption is not generally reversible ion exchange adsorption, and more likely to be chemical adsorption , After adsorption basically does not convert to high polysilicic acid structure, and more likely to rearrange the structure into the internal structure to go. Based on these results, we propose a theoretical image of the geochemical transition of active silicon in estuaries: that is, active silicon is mainly transferred by the adsorption of hydroxide precipitates such as iron and aluminum formed due to the increase of pH and salinity, Into a more stable form of iron, aluminum silicate compounds, deposited on the sea floor. In order to further verify the reality of this theoretical image, we conducted some on-site sampling and analysis studies again in the Jiulong River estuary. We attempted to summarize the distribution of silicon, iron and aluminum in various forms of sea water suspended solids through estuaries , And contrast with the theoretical image.