A new portable test could make checking water safety faster and easier than ever before.
Scientists have developed a simple system that uses a smartphone to detect contamination in water in less than a minute.
The research, led by experts at the Federal Institute for Materials Research and Testing, was published in the journal ACS Sensors.
Around the world, billions of people rely on water sources that may not always be safe. Testing water for contamination is often slow and complicated.
Traditional methods can take up to 24 hours and usually require laboratory equipment and trained specialists. This delay can be a serious problem, especially during emergencies such as floods or in areas without access to proper testing facilities.
The new method focuses on detecting a molecule called urobilin. This substance forms naturally in the body when hemoglobin breaks down and is later excreted.
If urobilin is found in water, it is a strong sign that the water may be contaminated with human or animal waste.
To make detection faster and simpler, the researchers designed a special test strip that reacts when it comes into contact with contaminated water. When urobilin is present, the strip produces a faint glow. This glow can then be measured using a smartphone.
The system includes a small, 3D-printed attachment that fits onto a phone. It contains a tiny LED light powered by the phone itself. After placing a drop of water on the test strip, the phone’s camera captures the light signal and analyzes it. The entire process follows a “drop-and-detect” approach, meaning only a single drop of water is needed to get a result.
Tests show that the method is both sensitive and reliable. It can detect extremely small amounts of urobilin, often faster and more easily than traditional lab techniques. Importantly, the system also works well in real-world conditions. Researchers tested it using samples from rivers and from a wastewater treatment plant in Berlin. Even in complex environments with many other substances present, the test was able to identify contamination accurately.
Because it does not require additional chemicals or laboratory tools, the system is especially useful in the field. It could be used in remote areas, developing countries, or disaster zones where quick decisions about water safety are critical. It also has potential for routine monitoring, allowing authorities or communities to check water quality more frequently and conveniently.
Beyond its immediate use, the technology highlights how digital tools can transform environmental monitoring. By combining simple materials with smartphone technology, the researchers have created a solution that is both practical and scalable.
In the future, similar systems could be adapted to detect other types of pollutants, making water testing even more accessible. This innovation represents an important step toward safer water and better public health worldwide.
