Many different contaminants can render water unsafe to drink. Biosensors can simultaneously detect multiple contaminants, but require bulky and expensive equipment to implement. Profs. Yosi Shacham-Diamand and Shimshon Belkin have recently developed a portable biosensor called a “Dip Chip” capable of detecting toxic materials in water and determining if it’s safe to drink. They suggest that these sensors could one day be plugged into mobile devices to display a toxicity reading. This would make it a cheap and easy tool for campers or soldiers.
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Dip Chip Technology Tests Toxicity On the Go – Science Daily