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Optical Sensor Developed In India Detects Arsenic In Real Time, Providing An Affordable And Effective Tool For Environmental Monitoring And Water Safety.
Indian researchers have developed an optical sensor that promises to transform water quality monitoring. The new technology allows for the detection of extremely low levels of arsenic in real time, directly at home.
This can help millions of people worldwide protect their health by simply and effectively monitoring the water they consume.
Global Issue
Arsenic contamination in drinking water is an environmental and public health challenge affecting millions of people.
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Arsenic is naturally released from rocks and soil into groundwater through geological processes. However, human activities such as mining, industrial waste disposal, and the use of arsenic-based pesticides exacerbate this problem.
Prolonged consumption of arsenic-contaminated water can have serious health consequences. Among the associated problems are poisoning and various types of cancer, including skin, lung, kidney, and bladder cancer. Therefore, effective and affordable monitoring methods are essential to ensure public safety.
Accessible And Efficient Technology
The developed optical sensor uses optical fiber and the phenomenon of localized surface plasmon resonance to detect arsenic.
Its sensitivity is impressive: it can identify arsenic levels as low as 0.09 parts per billion (ppb), which is 111 times more sensitive than the 10 ppb limit set by the World Health Organization (WHO).
Another highlight of the technology is the response time. The sensor conducts the analysis in just 0.5 seconds. Additionally, it has demonstrated high repeatability, stability, and reliability under different conditions, making it a practical and robust tool for home use.
Advantages Over Traditional Methods
Conventional arsenic detection methods, such as spectroscopic techniques, offer high precision. However, they require expensive, bulky equipment and operation by specialized personnel. This limits their use, especially in resource-limited communities.
In contrast, the new optical sensor stands out for its simplicity and low cost. It does not require specialized training and can be used directly at home.
The device features an internal coating of gold nanoparticles and a nanocomposite of aluminum oxide and graphene oxide, materials that demonstrate high affinity for arsenic ions.
When arsenic binds to this nanocomposite, a measurable change occurs in the plasmonic resonance wavelength, allowing for accurate detection.
Proven Performance In Real Conditions
The sensor has undergone rigorous testing to assess its effectiveness. Solutions with different concentrations of arsenic were used, and the results demonstrated consistent and reliable detection across all tested ranges.
The maximum resolution achieved was ± 0.058 ppb, and there were no significant variations in results during tests conducted on four different days over a period of 18 days.
Furthermore, the sensor was compared to the standard arsenic measurement method, inductively coupled plasma mass spectrometry (ICP-MS). The relative difference between the results was less than 5%, confirming the high precision of the new device.
Field Tests Confirm Efficacy
To validate its applicability in real conditions, the sensor was tested on drinking water samples collected from various locations in the city of Guwahati, India.
In all tests, the device showed reliable performance and consistent results. This demonstrates its feasibility for field use, offering a practical and accessible solution for home water monitoring.
Contribution To Public Health
According to lead researcher Sunil Khijwania from the Indian Institute of Technology, Guwahati, the project aims to provide a sensitive, selective, reusable, and economical sensor.
The idea is for it to become a reliable and easy-to-use tool for routine water monitoring, helping communities protect themselves from arsenic exposure.
The development of this technology represents a significant advancement toward accessible and effective water monitoring. Although the sensor is already ready for field application, researchers emphasize the need to develop a cheaper and easier-to-operate optical source and detector to facilitate its large-scale adoption.
With info from ecoinventos. Study available at Optica.
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