Despite the tardy arrival of springlike weather in much of the country, thoughts invariably turn towards such summer pleasures as backyard barbecues and afternoons in the pool.
Pool safety is important, and so is etiquette. Your mother probably told you not to pee in the pool. And you know what? She was right.
Even though everyday swimmers and Olympians alike admit to the practice, researchers now say that there's scientific evidence that argues against pool peeing.
They report that when mixed, urine and chlorine can form substances that can cause potential health problems. Their study appears in the American Chemical Society journal Environmental Science & Technology.
Jing Li, Ernest Blatchley, III, and colleagues note that adding chlorine to pool water is the most common way to kill disease-causing microbes and prevent swimmers from getting sick.
But as people swim, splash, play — and pee — in the pool, chlorine mixes with sweat and urine and makes other substances. Two of these compounds, including trichloramine (NCl3) and cyanogen chloride (CNCl), are ubiquitous in swimming pools.
The first one is associated with lung problems, and the second one can also affect the lungs, as well as the heart and central nervous system. But scientists have not yet identified all of the specific ingredients in sweat and urine that could cause these potentially harmful compounds to form.
So Li's team looked at how chlorine interacts with uric acid, a component of sweat and urine.
They mixed uric acid and chlorine, and within an hour, both NCl3 and CNCl formed. Though some uric acid comes from sweat, the scientists calculated that more than 90 percent of the compound in pools comes from urine.
They conclude that swimmers can improve pool conditions by simply urinating where they're supposed to — in the bathrooms.
The study was funded by the Chinese Universities Scientific Fund, the National Natural Science Foundation of China and the National Swimming Pool Foundation.
Despite the tardy arrival of springlike weather in much of the country, thoughts invariably turn towards such summer pleasures as backyard barbecues and af...