| 摘要 |
The present invention provides dense silica particles with reduced metal impurities. Specifically, the present invention provides a colloidal silica produced by using an alkyl silicate as a starting material, wherein, with respect to a sample prepared by adding, as an internal standard, 1 wt. % of polydimethylsilane to a dried product of the colloidal silica, a peak area value calculated using a formula of a colloidal silica peak area/a polydimethylsilane peak area is 15 or less, the peak areas being determined by an obtained solid-state 29Si-CP/MAS-NMR spectrum. The present invention further provides a method for producing the colloidal silica.
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