Gold nanoparticles-based chemical sensor for on-site colorimetric detection of arsenic in water samples

摘要

We report the Lauryl Sulphate (LS) modified gold nanoparticles (AuNPs) as a Localized Surface Plasmon Resonance (LSPR) based chemical sensor for the colorimetric detection of arsenic in water samples. This colorimetric LSPR based detection of arsenic found to be a simple, selective, sensitive, and can be applied at the sample source. The method was based on the color change of AuNPs from pink to blue with the addition of arsenic to NPs that caused the shift in LSPR band due to the inter-particle coupling effect. The calibration curve was linear over 5-500 μgL~(-1) arsenic with Limit Of Detection (LOD) of 2 μg/L and correlation estimation (r~2) of 0.994. The concentration of arsenic found in water samples of central India was in the range 15 to 350 μgL~(-1) which was found higher than WHO Tolerance Limit Value of 10 μgL~(-1) (TLV).