Health standard for dust containing 50 % ~80 % free silica in the air of workplace.

车间空气中含50%～80%游离二氧化硅粉尘卫生标准.

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A method for chemical phase analysis of free silica in limestone was discussed in this paper.

介绍了石灰岩中游离二氧化硅的化学物相分析方法.

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Health standard for dust containing more than 80 % free silica in the air of workplace.

车间空气中含80%以上游离二氧化硅粉尘卫生标准.

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