Project 1 - Developing In Situ, Real-Time Sensors for Toxicants at Superfund Sites

 

Development of sensors for carcinogenic alkylating agents and predicting their spatiotemporal dynamics in water near Superfund Sites.

 

Project Leaders: Harry Hemond, Tim Swager

 

Public health personnel and environmental engineers need timely and complete information to protect people from environmental toxicants and to design optimal remedies for contaminated sites. However, they face a near-universal problem: conventional field sampling, transport, and in-lab chemical analyses are slow, costly, and often unable to provide enough data on varying concentrations, patchy distributions, or inconsistent release rates of toxicants from contaminated sediments. Without adequate environmental data, biological research is severely hampered in contributing to public health protection. Project 1 aims to meet this problem with new concepts, methods and technologies intended to overcome the critical barrier to progress created by the shortcomings of slow and costly conventional analyses.

This project focuses on two important toxicants, N-nitrosodimethylamine (NDMA) and polycyclic aromatic hydrocarbons (PAHs), but also provides insights and methodologies relevant to the general problem of detection, mapping, and movement of harmful species. 

As part of this project, MIT SRP researchers develop and test in situ sensors to measure the concentrations of toxicants in water. The sensors are portable for use by field personnel, and can be moored at fixed locations long-term sentinels for toxicant mapping. Further reflecting the critical role of contaminated sediments, the research team is developing in situ technology to expeditiously determine location-specific rates at which sediment-borne toxicants are released to their surface waters (i.e., benthic fluxes). This information will help improve estimates of human exposure and optimize remediation strategies.

This project creates training opportunities for students to design and test novel sensors, deploy sensors in real-world settings and on novel platforms, and take part in community environmental affairs.