MIT shuts chemistry lab after student claims unauthorized synthesis of dimethyl mercury

Key points

• A graduate student arrived at a local emergency room on Wednesday, August 26, claiming to have synthesized dimethyl mercury in MIT’s Building 18, also known as the Dreyfus Building.
• MIT closed Building 18 and called in Cambridge Fire Department hazmat teams to assess and decontaminate the area, which remained closed at least through Sunday, August 30.
• The student was not authorized to work with dimethyl mercury, and the compound was not part of any MIT research program, according to school officials.
• Initial blood test results for the student, received on Saturday, showed no sign of mercury exposure, though the student remained under medical supervision.
• MIT officials contacted individuals who had been in the Wendlandt lab or common areas on the second and fifth floors of Building 18 for surveillance testing and contact tracing.
• Emerging information calls into question whether dimethyl mercury was actually synthesized, according to an MIT spokesperson.

Background

Dimethyl mercury is known for its extreme toxicity; in 1997, Dartmouth College chemistry professor Karen Wetterhahn died after exposure to just one to two drops of the compound. The substance is primarily used for calibrating nuclear magnetic resonance equipment. This incident follows other recent hazardous material events, such as the deadly fire at Russia’s Amur Gas Chemical Complex in late August 2026, which killed 15 workers.

How outlets are covering it

NBC Boston and WHDH reported the incident as a hazmat response triggered by a student’s claim of synthesizing dimethyl mercury, emphasizing the closure of Building 18 and the lack of mercury in the student’s initial blood test. The New York Post highlighted the extreme lethality of dimethyl mercury, noting its role in the 1997 death of a Dartmouth professor and a 2012 assassination, framing the event as a 'massive hazmat response.' Cambridge Day provided additional details, identifying the lab as the Wendlandt lab, led by associate professor Alison Wendlandt, and noting that Triumvirate Environmental, a Somerville-based company, was hired to decontaminate the building. Cambridge Day also reported that the surrounding area was surveyed by Cambridge Fire meters and appeared clear, with only a small amount of the substance spilled inside a hood. All sources agreed that the student was not authorized to work with the compound and that the risk of secondary exposure was considered low.

Why it matters

The incident underscores the severe risks associated with handling highly toxic chemicals like dimethyl mercury, even in controlled academic settings. It highlights the importance of strict laboratory safety protocols and the rapid response mechanisms in place at institutions like MIT to mitigate potential hazards. The case also raises questions about the verification of such claims, as emerging information suggests the compound may not have been synthesized at all.

What to watch

MIT will continue to monitor the student’s medical status and conduct further testing to ensure the safety of the campus community. The investigation into whether dimethyl mercury was actually synthesized is ongoing, and MIT will likely review its laboratory safety protocols to prevent similar incidents in the future.