Abstract
Unprecedented amount of heavy metal ions are being released into the aquatic environment due to exponentially increasing industrial sewage. Heavy metal ions pose a serious threat to various organisms including humans. Heavy metals are carcinogenic, non-biodegradable and tend to bioaccumulate. In brief, it possibly poses a lethal threat to the health of humans and the ecosystem. A simple, affordable, rapid and selective technique for the detection of heavy metal ions is of prime requisite. Quantum dots (QDs) based sensors offer several advantages over traditional methods for the sensing of heavy metal ions. Metal ions are detected through substantial modification in emission intensity of QDs, as a result of proximity of metal ions to the surface of QDs. In this study, I have synthesized a facile water-soluble CdS QDs, stabilized using biocompatible starch. The luminescence property of the CdS QDs is massively quenched, when it is in contact with heavy metal ions. A visual color-changing probe, based on a paper-strip, has been fabricated to detect the presence of specific heavy metals in the field samples.
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