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US 8,568,825 B2Granted
Ultra-sensitive simultaneous electrochemical determination of arsenic, mercury and copper
AssigneeIndian Institute of Technology
InventorsC. Retna Raj, Bikash Kumar Jena
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Abstract
A sensor for the simultaneous detection of inorganic contaminants, As (III), Hg (II) and Cu (II) in water and having a limit of detection of 0.02 ppb, comprising a conducting support having a layer comprised of a three dimensional silicate network comprised of thiol tail groups immobilized with citrate stabilized gold nanoparticles, wherein the gold nanoparticles have a size in the range of 70 to 100 nm.
Claims11
A process for manufacturing a sensor for the simultaneous detection of inorganic contaminants of water comprising:
- providing a conducting support;
- adding a (3-mercaptopropyl) trimethoxysilane (MPTS) sol thereto;
- forming a silicate network modified support from the MPTS;
- preparing a mixture containing citrate stabilized gold nanoparticulates;
- soaking the silicate network modified support in the mixture containing citrate stabilized gold nanoparticulates to immobilize the gold nanoparticulates on the silicate network modified support;
- preparing a solution of hydroxylamine and chloroauric acid;
- shaking the solution of hydroxylamine and chloroauric acid;
- and
- placing the conducting support inside the solution of hydroxylamine and chloroauric acid, to obtain the sensor,
- wherein shaking the solution of hydroxylamine and chloroauric acid occurs at 200 to 500 rpm.
7 more elements
Dependencies are inferred from the claim text.