Simple water test could prevent crippling bone disease

The simple test changes color from purple to blue when fluoride levels are too high. Credit: University of Bath

A simple colour-changing test to detect fluoride in drinking water, devised by researchers at the University of Bath, could in the future prevent the crippling bone disease, skeletal fluorosis, in developing countries such as India and Tanzania.


Whilst low amounts of are beneficial for healthy teeth, high levels of fluoride can weaken bones, leading to skeletal fluorosis. This disease causes crippling deformities of the spine and joints, especially in children whose skeletons are still forming.

When water passes over certain minerals, it can dissolve fluoride, which results in elevated levels of fluoride in sources in parts of East Africa, India, China and North America.

Levels of fluoride in drinking water are routinely monitored and controlled at treatment works in developed countries. However in areas of the world where there is no piped water system or treatment works, people rely on drawing untreated water from wells, which can often be contaminated with higher than recommended levels of fluoride.

The amounts of fluoride in the groundwater can vary due to weather events, with levels fluctuating hugely when there is a lot of rain.

A research team at the University of Bath’s Centre for Sustainable Chemical Technologies, and the Water Innovation and Research Centre (WIRC), led by Simon Lewis, has developed a simple colour-changing that detects high levels of fluoride quickly and selectively.

Whilst the test is at the proof of concept stage, the team aims to develop it into a disposable test strip that is low cost and easy to use by anyone.

Dr Lewis said: “Whilst a small amount of fluoride is good for your teeth and prevents tooth decay, high levels are toxic and can cause crippling deformities that are irreversible.

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Credit: University of Bath

“Most water quality monitoring systems need a lab and power supply and a trained operator to work them. What we’ve developed is a molecule that simply changes colour in a few minutes which can tell you whether the level of fluoride is too high.

“This technology is in the very early stages, but we’d like to develop this technology into test strips,…

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