Rapid Determination of Chloride Using Silver Triangular Nanoplates

A sensitive and accurate method for the determination of chloride using citrate-stabilized silver triangular nanoplates was developed. Chloride caused a color change of silver triangular nanoplate solution from blue to yellow by fusion and etching, as confirmed by transmission electron microscopy and ultraviolet-visible absorption spectroscopy. The spectrophotometric determination involved measurement of the spectra involving localized surface plasmon resonance. The change in the ratio of absorption at 642 and 430 nanometers was proportional to the concentration of chloride from 0.10 to 0.30 millimolar with a correlation coefficient of 0.9977. To determine the feasibility of the method, cooling water was analyzed. Good recoveries were obtained with relative standard deviations of 3.09 to 5.42 percent. These results demonstrated that the method was accurate, reliable, and rapid for the determination of chlroide.