Researchers have found that hair, toenails and fingernails can provide an easy way to measure how much one is exposed to potentially harmful chemicals called flame retardants, which are frequently added to plastic, foam, wood and textiles.
Exposure to flame retardants in various forms has been linked to obesity, learning disabilities, neuro and reproductive toxicity, and endocrine disruption.
“Little is known about the human exposure to flame retardants, especially new classes of the retardants,” said one of the researcher Amina Salamova from Indiana University Bloomington in the US.
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“The first step is to establish a relatively easy and reliable way of measuring chemical levels in people, especially children, and we’ve determined that hair and nails can provide exactly that,” Salamova noted.
Until now, researchers depended on samples of human milk, blood and urine, and those samples are more difficult to obtain than hair and nails.
For the study, published in the journal Environmental Science and Technology, the researchers collected hair, fingernails and toenails from 50 students in Bloomington and compared the levels of chemicals found in those samples with what was found in blood from the same people.
Salamova and colleagues found that there was a strong relationship between the levels of a large group of flame retardants, the polybrominated diphenyl ethers or PBDEs, in hair and nails, on the one hand, and those in serum, on the other.