
The Chicago Sun-Times published a slightly disturbing report in yesterday’s edition. Apparently, tests on Chicago tap water reveal small amounts of DEET. DEET is a compound originally developed by the U.S. military. It is still just about the best bug repellant out there. It is the major compound in OFF.
Most experts say that it is nothing to worry about. Excerpts and links:
The concentration detected in a sampling of Chicago tap water was low — 8.3 parts per trillion. Health experts said the level found in the Sun-Times testing shouldn’t pose a health hazard.
Still, said Mohamed Abou-Dania, a professor at Duke University who has done extensive research on the neurological effects of DEET, “This raises a red flag. [When] you have so many people using it, the risk is there.”
And the chemical was detected in Chicago drinking water sampled in March, when one would expect the use of mosquito repellent to be low.
The U.S. government doesn’t have standards for DEET in drinking water. Nor does it require the removal of other contaminants recently found in other water studies — including pharmaceuticals, flame retardants and plasticizers.
Used as directed, DEET is considered safe for people over 2 months of age. But at very high levels or when used long-term, DEET has been implicated in nervous-system damage. Medical literature on the chemical cites rare cases of children suffering poisoning or even death from overexposure or ingestion of DEET.
Abou-Donia’s studies of DEET exposure to laboratory rats found no effect when a standard dose was used for 30 days. After 60 days, though, brain-cell death occurred.
When DEET was approved a half century ago for consumer use, no one considered the potential environmental effects.
But after DEET is washed down the drain, flushed down a toilet or thrown in the garbage, it doesn’t degrade quickly. It has been detected in natural-water bodies throughout the United States, Europe, Australia and even in the North Sea.
Unlike some chemical compounds, DEET remains fairly intact as it passes through sewage or drinking-water treatment plants.
The U.S. Geological Survey’s Stackelberg tracked water at a New Jersey water-treatment facility, testing it for contaminants when it began as source water and then after each step of the cleaning process. He found DEET at every step, in every one of the samples.
The insect repellent’s resilience raises questions about whether it stays in the sediment of streams, and whether fish or birds — to which DEET can be toxic — could be harmed over the long term.
“A little bit seems to go a long way in the environment,” said Dana W. Kolpin, a research hydrologist with the Geological Survey in Iowa City, Ia., who has studied DEET.
http://tinyurl.com/3mydyo

* DEET has been fending off mosquitoes for more than six decades, having been developed by the U.S. Army in 1946 for soldiers in bug-infested areas.
* It was first marketed to consumers in 1965. Today, it’s found in about 140 insect-repelling products — including the widely known and used Off! repellents.
* DEET works by masking the sensory perception of lactic acid on the skin, causing bugs to look elsewhere for a host to bite.
http://tinyurl.com/3hxk44