Abstract
AbstractA new method for the determination of ultratrace silver(I) by near field laser thermal lens spectrometry has been developed. This method is based on the silver(I) catalyzed discoloring reaction of bromcresol green oxidized by sodium persulfate in the presence of α,α'‐bipyridine as an activator and TritonX‐100 as a sensitizer. The reaction mechanism was discussed. The linear range of the method is 0–1.6 ng·mL−1 and the detection limit is 2×10−2 ng·mL−1 for silver. The method has been applied to the determination of silver in lead powder and photographic paper with satisfactory results.
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