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Thursday, 22 July 2010

Diving In The Deep End

One of the serious difficulties for people with chemical issues or MCS is how or why they became sensitised in the first place. After many years enjoying regular swims for exercise and leisure I had to give up. My skin started reacting very badly and given my more serious chemical problems it became too great a risk. This was in a Health Club pool, rather less used and more controlled than the local public one.

I had talked to the pool manager about it and he told me that that the job had become more demanding and complex in recent years. It was clear that the levels of general contamination had increased greatly causing more chlorine to be pumped in to meet the safety levels demanded.

Not only did people have far more chemical products on their skin and costumes but many fewer seemed to be showering. They believed that using a deodorant spray was a better way of freshening up for the pool.

The article below is interesting in this context.


Science News, ScienceDaily, 21 July 2010

Recreational Pool Disinfectants Linked to Health Problems

Splashing around in a swimming pool on a hot summer day may not be as safe as you think. A recent University of Illinois study links the application of disinfectants in recreational pools to previously published adverse health outcomes such as asthma and bladder cancer.

Each year, 339 million visits take place at pools and water parks across the United States. Not only is swimming fun, but it's also the second most popular form of exercise in the country. Because of this, disinfection of recreational pools is critical to prevent outbreaks of infectious disease.

However, Michael Plewa, U of I professor of genetics, said negative outcomes can occur when disinfection byproducts form reactions with organic matter in pool water.
Pool water represents extreme cases of disinfection that differ from the disinfection of drinking water as pools are continuously exposed to disinfectants.

"All sources of water possess organic matter that comes from decaying leaves, microbes and other dead life forms," Plewa said. "In addition to organic matter and disinfectants, pool waters contain sweat, hair, skin, urine, and consumer products such as cosmetics and sunscreens from swimmers."

These consumer products are often nitrogen-rich, causing concern that they may contribute to the generation of nitrogenous disinfection byproducts, Plewa added. When mixed with disinfectants, these products may become chemically modified and converted into more toxic agents.

These disinfection byproducts can mutate genes, induce birth defects, accelerate the aging process, cause respiratory ailments, and even induce cancer after long-term exposures. In this study, collections from public pools and a control sample of tap water were evaluated to identify recreational water conditions that could be harmful to your health.

A systematic mammalian cell genotoxicity analysis was used to compare the water samples. Plewa said this sensitive DNA technology examined genomic damage in mammalian cells, allowing researchers to investigate damage at the level of each nucleus within each cell.

The study compared different disinfection methods and environmental conditions. Results proved that all disinfected pool samples exhibited more genomic DNA damage than the source tap water, Plewa said.

"Care should be taken in selecting disinfectants to treat recreational pool water," Plewa advised. "The data suggest that brominating agents should be avoided as disinfectants of recreational pool water. The best method to treat pool waters is a combination of UV treatment with chlorine as compared to chlorination alone."

Plewa recommends that organic carbon be removed prior to disinfection when the pool water is being recycled.

Also, swimmers can help reduce the genotoxicity of pool water by showering before entering the water. Pool owners should also remind patrons about the potential harm caused by urinating in a pool. These simple steps can greatly reduce the precursors of toxic disinfection byproducts, Plewa said.

This research was published in Environmental Science & Technology and supported by grants from the National Science Foundation. Researchers included Michael Plewa and Elizabeth Wagner of the U of I, Danae Liviac of The Universitat Autonoma de Barcelona, and William Mitch and Matthew Altonji of Yale University.


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