Society For Risk Analysis Annual Meeting 2017

Session Schedule & Abstracts

* Disclaimer: All presentations represent the views of the authors, and not the organizations that support their research. Please apply the standard disclaimer that any opinions, findings, and conclusions or recommendations in abstracts, posters, and presentations at the meeting are those of the authors and do not necessarily reflect the views of any other organization or agency. Meeting attendees and authors should be aware that this disclaimer is intended to apply to all abstracts contained in this document. Authors who wish to emphasize this disclaimer should do so in their presentation or poster. In an effort to make the abstracts as concise as possible and easy for meeting participants to read, the abstracts have been formatted such that they exclude references to papers, affiliations, and/or funding sources. Authors who wish to provide attendees with this information should do so in their presentation or poster.

Common abbreviations

Exposure to Chemical Contaminats in Food and Drinking Water

Room: Salon 2   3:30 pm–5:00 pm

Chair(s): Chris Greene

Sponsored by Exposure Assessment Specialty Group

T4-K.1  3:30 pm  Characterizing co-contamination in marine and freshwater fish and shellfish using generalized joint attribute modeling. Bourne K, Curtis A, Borsuk ME*, Chen CY; Duke University

Abstract: To protect human health from contaminant exposure, fish consumption advisories have been established throughout the US for freshwater and coastal ecosystems. Although advisories are contaminant-specific, the reality is that, through fish consumption, humans are exposed to multiple contaminants simultaneously. The co-occurrence of contaminants in fish tissue has not been systematically examined. This is largely due to the “silos” in which contaminant research is often conducted. Yet, to understand the totality of exposure from fish consumption and begin to evaluate the risk of exposure to multiple contaminants, it is critical to investigate the patterns of co-occurring contaminants in fish from a range of ecosystems. In this study, we utilize the wealth of available fish tissue data to quantitatively characterize the patterns of contaminant co-occurrence using a new approach called generalized joint attribute modeling (GJAM). GJAM allows for analysis of multivariate data that can include combinations of presence-absence, ordinal, continuous, discrete, zero-inflated, and censored values. Importantly, GJAM does this by representing the joint distribution of response variables. GJAM also provides estimates of the effect of covariates on the individual response variables and their correlations, thus allowing for inference on the processes that drive co-occurrence of contaminants in the fish and shellfish that humans consume.

T4-K.2  3:50 pm  Trends in Toxicity Adjusted Dietary Exposure to Organophosphorous and N-Methyl Carbamate Pesticides. Nako S*, Sarkar B; U.S. Environmental Protection Agency

Abstract: This presentation (poster) highlights two measures will be introduced in the U.S. Environmental Protection Agency’s Report on the Environment. These measures depict the effects of pesticide regulatory actions upon residues and resulting dietary exposures since the passage of the Food Quality and Protection Act of 1996. The trends indicate that high-end dietary exposures to OPs and NMCs have steadily declined over the time period, 1998-2015, mirroring declines in total agricultural usage (lbs ai) for these two class of pesticides. These measures are based on the same population-based statistic, toxicity adjusted exposures to OPs and NMCs at the Per capita 99.9th percentile, that the Agency use to assess acute dietary risks to pesticides. The downward trends reflect direct and indirect effects of regulatory actions, including both use restrictions on older chemicals and registration of new pesticides. Such measures may help provide a basis for depicting economic benefits and costs of alternative risk management options.

T4-K.4  4:10 pm  Racial Disparities in Access to Municipal Water Supplies in the American South: Impacts on Lead Exposure and Children’s Health. Stillo F*, MacDonald-Gibson J; University of North Carolina at Chapel Hill

Abstract: Throughout the American South, African American neighborhoods on the fringes of cities and towns were systematically excluded from municipal services, including water and sewer service, paved roads, and police and fire protection. More than five decades after the Civil Rights Act, many such neighborhoods still lack municipal services, even as those services have been extended to newer, majority white neighborhoods. Yet, little is known about the health impacts of these exclusionary zoning practices. This paper will assess risks of exposure to lead in drinking water in peri-urban African American neighborhoods of Wake County, NC, excluded from municipal water service and will assess associated health risks. We will report on results of water tests for lead in 60 households. We will quantify effects of lead exposure on children’s IQ in affected households using a combination of blood lead data and physiologically based pharmacokinetic modeling. While the recent Flint, Michigan, water crisis renewed attention to disparities in the quality of municipally supplied drinking water, this study is the first to assess lead exposure disparities arising from exclusion from municipal services—the reverse of the situation that occurred in Flint.

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