Abstract
A new chromogenic reagent, meloxicam was used for highly sensitive, selective and rapid method for the determination of silver based on the rapid reaction of silver(I) with meloxicam. In the presence acetate buffer solution of pH 4.6 and Triton X-100 as an optimum medium, meloxicam reacts with silver to form a yellow complex of molar ratio 1: 1 (silver to meloxicam). The molar absorptivity of the formed complex was calculated to be 1.124 x 10(4) L mol(-1) cm(-1) at 412 nm. Beer's law is obeyed in the range of 1.0-15.0 mu g mL(-1). The relative standard deviation for six replicate samples of 7.0 mu g mL-1 was 1.33%. The limits of detection and quantification were also calculated. Finally the repeatability, accuracy and the effect of interfering ions on the determination of silver ion were evaluated. The method was applied successfully for determination silver in some water samples.