{"document_url": "https://en.wikipedia.org/wiki/Johann_Schr%C3%B6der_(physician)"}
Johann Schröder (1600, Bad Salzuflen – 1664) was a German physician and pharmacologist who was the first person to recognise that arsenic was an element. In 1649, he produced the elemental form of arsenic by heating its oxide, and published two methods for its preparation.

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