Detection of Pb and Fe ions in wastewater using a low cost portable optical sensor derived from green synthesized metal oxide nanoparticle on a paper substrate.

Background: Water contamination is a global challenge, primarily due to heavy metal ions like lead (Pb), iron (Fe), cadmium (Cd), andmercury (Hg) as well as dyes. These pollutants enter the ecosystem from industrial waste and runoff, accumulate in the environment and pose a high risk to humans, animals and plants. Various sensors, such as colorimetric sensors, and electrochemical sensors have been developed to detect these ions and dyes.

Synergistic effect of greenly synthesized nanoparticles embedded in molecular imprinted polymer for the detection of food preservative: Formalin.

We report a neoteric study that accentuates the effectiveness of substrate-less molecular imprinted polymer (MIP) block acting as probe in detecting a carcinogenic food preservative, formalin (FOL). FOL is generally mixed with consumable products to increase their shelf-life. However, its ingestion has exposed human health to severe illnesses, comparable to chronic cancer.

Colorimetric and absorbance based sensor for sulfide and bicarbonate ions by dye doped polymer composite.

We have developed a simple, rapid and cost-effective Dual-channel "colorimetric and absorbance" sensor using polyvinylpyrrolidone (PVP) capped Rhodamine6g (Rh6G) dye composite. Dye-doped polymer composite probe (PVPRH) exhibit intense, narrow absorption properties and long-term stability than the bare Rh6G. The probe's colorimetric relationship with pH was demonstrated by absorption titration.