Electronic Taster
Scientist at Cardiff University in Wales are developing an alarm system that will provide warning of potentially harmful contamination in water supplies.
An array of tiny silicon chips, called an "electronic tongue", can be dipped into rivers or streams to ensure they contain nothing toxic.
The scientists treat each silicon chip with acid until it becomes etched with millions of tiny pores and channels, each with diameters of nanometers. This enables the chip to "taste" water for contaminants using similar principles to the technique of chromatography, but on a smaller scale.
The chip can then be linked to electrochemical processor for analysis.
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