朱砂含有重金属砷和汞。

Vermilion contains heavy metal arsenic and mercury.

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目的建立测定中药材中重金属砷铅汞的控制含量方法。

Objective To establish the method for determining controlled contents of As, Pb and Hg in Chinese medicinal materials.

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就像今天的煤灰一样，这些颗粒中可能也含有一些有毒金属，如铬和砷。

And like coal ash produced today, the particles would have been loaded with toxic metals such as chromium and arsenic.

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