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地下热水中二氧化硅浓度可用作地热温标,可估算地下热储的温度,为地热能的开发和利用提供信息,因此正确测定很有必要。但是地下热水有它的特殊性,与一般天然水比较二氧化硅含量通常比较高,尤其是高温地热水中含量在100毫克·升~(-1)以上。实践已证明,二氧化硅浓度超过100毫克·升,在水中易形成高分子聚合物。浓度越大,发生聚合越严重。此时若用光度法直接进行测定,所得结果会大大低于真值(见表)。因为光度法只能检测水中成正硅酸(H_4SiO_4)的二氧化硅。据文献报道,地热水中高含量二氧化硅的测定,
The concentration of silica in underground hot water can be used as a geothermic temperature scale. The temperature of underground thermal storage can be estimated to provide information for the development and utilization of geothermal energy. Therefore, proper determination is necessary. However, underground hot water has its own particularity. Compared with natural water, the content of silica is usually relatively high, especially in high-temperature geothermal water above 100 mg · L -1. Practice has proved that silica concentration over 100 mg · L, easy to form high polymer in water. The greater the concentration, the more serious polymerization occurs. At this point if you use photometry directly measured, the results will be significantly lower than the true value (see table). Because the photometric method can only detect silicon dioxide (H_4SiO_4) in water. According to the literature, the determination of high content of silica in geothermal water,