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New insights into when beach sand may become unsafe for digging and other contact

Date:
April 11, 2012
Source:
American Chemical Society
Summary:
With summer days at the beach on the minds of millions of winter-weary people, a new study provides health departments with information needed to determine when levels of disease-causing bacteria in beach sand could pose a risk to children and others who dig or play in the sand.

How safe are our beaches?
Credit: ACS

With summer days at the beach on the minds of millions of winter-weary people, a new study provides health departments with information needed to determine when levels of disease-causing bacteria in beach sand could pose a risk to children and others who dig or play in the sand. The report appears in ACS' journal Environmental Science & Technology.

Tomoyuki Shibata and Helena M. Solo-Gabriele explain that disease-causing bacteria from sewage can cause skin infections and gastrointestinal (GI) disorders in people who come into contact with contaminated water. The U.S. Environmental Protection Agency (EPA) has guidelines to determine when microbe levels in water are high enough to pose an unacceptable risk of GI illness for contact with both ocean water and freshwater. Microbes, however, tend to concentrate in higher levels in beach sand -- to the point where one previous study found that the sand on one fingertip, placed in the mouth, had enough germs to cause GI illness. No guidelines exist to determine when contact with beach sand might be too risky for children and others who play in beach sand, digging in it or being buried in the sand. The scientists set out to fill that knowledge gap.

The scientists used millions of computer simulations and measurements of disease-causing microbes at beaches in California and Florida to determine how many bacteria would have to be present in beach sand to exceed the EPA's guideline for water. In doing so, they established "reference levels" for beach sand that correspond to the EPA risk guidelines for water. The focus of children at the beach environment is especially important, due to play behavior at beach sites that would increase a child's exposure, the scientists noted.

The authors acknowledge funding from the National Science Foundation and the National Institute of Environmental Health Sciences.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal Reference:

  1. Tomoyuki Shibata, Helena M. Solo-Gabriele. Quantitative Microbial Risk Assessment of Human Illness from Exposure to Marine Beach Sand. Environmental Science & Technology, 2012; 120222080033007 DOI: 10.1021/es203638x

Cite This Page:

American Chemical Society. "New insights into when beach sand may become unsafe for digging and other contact." ScienceDaily. ScienceDaily, 11 April 2012. <www.sciencedaily.com/releases/2012/04/120411120510.htm>.
American Chemical Society. (2012, April 11). New insights into when beach sand may become unsafe for digging and other contact. ScienceDaily. Retrieved September 2, 2014 from www.sciencedaily.com/releases/2012/04/120411120510.htm
American Chemical Society. "New insights into when beach sand may become unsafe for digging and other contact." ScienceDaily. www.sciencedaily.com/releases/2012/04/120411120510.htm (accessed September 2, 2014).

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