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OALib Journal期刊
ISSN: 2333-9721
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水稻中硅元素的分布及存在状态
DOI: 10.3724/SP.J.1145.2012.00444, PP. 444-449
Keywords: 水稻,硅元素的分布,硅酸的存在状态,x线分析显微镜,sem
Abstract:
利用uv-vis分光光度计、x线分析显微镜及扫描电子显微镜（scanningelectronmicroscope，sem）对水稻不同器官中硅元素的含量、分布及存在状态进行观察和分析，研究水稻中硅酸的化学性质，为水稻硅元素的综合利用提供科学依据.结果表明：水稻以可溶性原硅酸的形式吸收土壤中的硅酸，同样以可溶性原硅酸的形式输送到各器官中.不同的生长期，水稻导管液内的可溶性原硅酸的含量不同，成熟期最高可达到912mg/l（以sio2表示）.通过比较导管汁液和土壤溶液的硅酸浓度可知，水稻选择性地吸收和浓缩硅酸，最高浓缩率可达85倍.x线分析显微镜观察发现，硅酸普遍存在于水稻各器官中，越是坚硬的部位硅酸分布得越多.sem图像表明，沉积在水稻各器官中的硅胶体具有一定的形状且不溶于强酸.对水稻干燥组分中硅酸含量的分析结果表明，稻壳中硅酸含量最高，达到13.3%，是生产硅单质及碳化硅材料的最有效的资源之一.
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