矿泉水中可溶性二氧化硅是评价鉴定矿泉水品质、类型的重要指标,而硅又是一切动植物所必需的微量元素。因此,测定矿泉水中硅具有重要意义。石墨炉原子吸收法测定硅,LO等人的石墨炉测硅机理认为是随灰化温度的提高,而硅易形成挥发性的SiO或高温难解离的SiC,致使灵敏度下降。因此,基体改进技术和石墨管改进技术,是提高测硅灵敏的有效途径。本文采用光控温度塞曼石墨炉原子吸收光谱法,研究了以钙作基体改进剂,钨涂层石墨管,对硅的灰化温度,原子化温度及干扰因素进行测定试验。结果表明,采用本法直接测定矿泉水中痕量硅,既降低了硅原子化温度,又提高了硅的测定灵敏,而且硅的测量精度也较好,方法的相对标准偏差小于5.0%,对 Mineral water soluble silica is to evaluate the quality of mineral water, an important indicator of the type, and silicon is all the necessary trace elements of plants and animals. Therefore, the determination of silicon in mineral water is of great significance. Graphite Furnace Atomic Absorption Spectrometry for the determination of silicon in silicon furnaces, LO furnaces, etc. The mechanism of silicon measurement in silicon furnaces is believed to be accompanied by an increase in ashing temperature while silicon tends to form volatile SiO or high-temperature refractory SiC, resulting in decreased sensitivity. Therefore, the matrix improvement technology and graphite tube improvement technology, is to improve the sensitivity of silicon measurement is an effective way. In this paper, light-controlled temperature Zeeman graphite furnace atomic absorption spectrometry, with calcium as a matrix modifier, tungsten-coated graphite tube, ashing temperature of silicon, atomization temperature and interference factors were measured. The results show that the direct determination of trace silicon in mineral water by this method not only reduces the silicon atomization temperature, but also improves the sensitivity of the determination of silicon, and the measurement accuracy of silicon is also better. The relative standard deviation of the method is less than 5.0%