Accurate.
According to the Google Patent Network, we learned that the method of detecting silver ions by spectrophotometry first prepares the required silver ion solution, aptamer? silver ion solution, and negatively charged nanogold solution; Add the negatively charged nano-gold solution to the bulk silver ion solution and let it act for 5 minutes. Then add a sodium chloride solution with a concentration of 0.2 mol/L to induce the agglomeration of the nano-gold to obtain a standard solution. The standard solution is scanned by the UV-visible absorption spectrum. Measure and draw a standard curve; then prepare the solution to be tested, scan the UV-visible absorption spectrum of the obtained solution to be tested, and calculate the concentration of silver ions in the water sample to be tested based on the standard curve. The method of the present invention has good selectivity and good reliability, resulting in high detection sensitivity and low detection limit. Moreover, the detection operation can be completed only by using a cheap and universal spectrophotometer. The entire detection operation is simple and fast, and the operation technology is greatly improved. The technical requirements for personnel are low and it is easy to be widely implemented and applied. It is known from this that the spectrophotometric method is accurate in detecting silver ions.