INTRODUCTION Silicon dioxide, also known as silica, is a good electrical insulator, has high thermal stability and is resistant to abrasion. For these reasons, silica finds use in the production of glass for materials such as beverage bottles, drinking glasses and windows. It is also used as the primary component in optical fibers used for telecommunication and in ceramic materials such as porcelain and stoneware. Prodigy直流電弧光譜儀/ICP直流電弧光譜儀