People in all facets of life are exposed to volatile toxins that may cause them to unexplainably sicken. The NIEHS Exposure Biology and Exposome Program has the ambitious and worthy goal to track a persons exposures from conception to death and correlate these with biological responses and health outcomes. Achieving this goal will require numerous inexpensive sensors that can measure chemical exposure of a mobile population under wildly varying conditions. Continuous assessment of an individuals exposure over long periods of time will require an extensive network of inexpensive fixed site and wearable monitors. To advance this goal, this project aims to develop passive area and personal dosimeters that measure a person's exposure to chemicals by testing the air that the person breathes regardless of location. Moreover, since many volatile toxin may not have been identified and their potential threat to health is unknown, it is necessary that these monitors can gather, store, and stabilize vapors from a broad array of chemical compounds with widely varying chemical properties. XploSafe plans to develop and commercialize the next generation of passive dosimeters and area samplers for NIEHS and industrial hygiene applications. The research will focus on potential chemical contaminants that people could encounter through work-related exposures or interactions with their ambient environments. The dosimeters will be based on a novel sorbent material that is capable of adsorbing and stabilizing even highly reactive compounds through a nanoconfinement effect. Thus, these dosimeters provide the chemical stability required for complete analysis before sample degradation takes place. Flexible control of surface chemistry and the ability to mix sorbents with varying functionalization can allow creation of sorbent blends that address all classes of organic contaminants. Specific research objectives will include (1) Preparation of target sorbents with surfaces tailored for sorption of various types of organic chemicals (2) Determination of the uptake capacities and rates of adsorption of target compounds belonging to 10 different classes of airborne organic compounds (3) Demonstrate the desorption and subsequent analysis of adsorbed compounds (4) Determine the effects of long-term storage of monitors with adsorbed contaminants and (5) Design of dosimeter and area monitors to include a clip-on badge and a fabric strip. If successful, this project will result in the development of markedly improved wearable dosimeters and fixed site monitors for determining personal exposure to hazardous vapors. Commercialization of the new technology will address NIEHSs needs and the civilian market for passive dosimeters and area monitors. The solution will be commercialized as a full-service offering that will include dosimeter badges and analysis for specific and broad categories of toxic vapors. These could be used for continuous monitoring of both personal exposure and the sites where exposure takes place The XploSafe solution will also allow industrial hygiene sampling such as 8- hour TWA (time-weighted average); or 15-minute STEL (short-term exposure limit) for workplace monitoring.
Public Health Relevance Statement: Project Narrative People in all facets of life are exposed to volatile toxins that may cause them to unexplainably sicken leading to a need for continuous measurement of an individuals exposure over long periods of time that in turn requires an extensive network of area and personal dosimeters that measure a person's exposure to chemicals by testing the air that the person breathes regardless of where the person goes. Moreover, the individual exposure to volatile toxin can be unpredictable due the persons mobility, and knowledge of all potentially volatile toxins in a given location may not be complete, it is necessary that these monitors can gather, store, and stabilize vapors from a broad array of chemical compounds with widely varying chemical properties. This project will target the development of the next generation of lightweight, inexpensive, passive (non-powered) area and personal dosimeters that are capable of meeting these goals and safeguarding the health of people from airborne pollutants.
Project Terms: abstracting; Address; Adsorption; Air; Area; base; Biological; Biology; Breathing; Calibration; Categories; Cessation of life; Chemical Exposure; chemical property; chemical stability; Chemicals; Chemistry; Clip; cold temperature; commercialization; Conceptions; design; Development; Devices; Dose; dosimetry; Environment; Experimental Models; experimental study; Exposure to; flexibility; functional group; Generations; Goals; Health; Heating; High temperature of physical object; Hour; improved; Individual; Industrial Health; Injection of therapeutic agent; Knowledge; Life; light weight; Literature; Location; Long-Term Effects; Marketing; Mass Fragmentography; Mass Spectrum Analysis; Measurement; Measures; Medical; meetings; Modeling; Monitor; National Institute of Environmental Health Sciences; new technology; next generation; novel; Organic Chemicals; organic contaminant; Outcome; Persons; Phase; pollutant; Population; Powder dose form; Preparation; programs; Refrigeration; Research; response; Sampling; sensor; Services; silanol; Silicon Dioxide; Site; solvent extraction; Spectrum Analysis; success; Surface; Technology; Temperature; Testing; Textiles; Time; TLV-STEL; Toxin; uptake; vanillin; vapor; Weight; Work; Workplace
