碘-碱性艳蓝BO体系分光光度法测定痕量银的研究

研究了萘基二苯甲烷染料和染料与AgI₂]-缔合物光谱和分析性能。提出了一种基于在H₃PO₄～NaH₂PO₄缓冲溶液中碱性艳蓝BO与AgI₂]-反应生成蓝色缔合物，采用分光光度法测定痕量银。其最大吸收波长为574 nm，表观摩尔吸光系数7.25×104 L·mol-1·cm-1 ，线性范围4～250 μg·L-1，回收率97.0%～98.3%，相对标准偏差2.7%。此方法可应用于水体中痕量银的测定。

Study and Spectrophotometric Determination of Trace Silver with Iodide-Victoria Pure Blue BO System

Analytical properties and spectra of naphthyl diphenymethane basic dyes and associated complexes of dye with AgI2]- was studied. A new method for the spectrophotometric determination of trace amount of silver was developed. The method was based on the Victoria Pure Blue BO reacted with AgI2]- to form blue associated complex in the buffer medium of H3PO4 -NaH2PO4. The spectrophotometric measurements were directly carried out at 574 nm, the apparent molar absorptivity of associated complex was 7.25 x 10(4) L x mol(-1) x cm(-1). The Beer's law was obeyed in the range of 4-250 microg x L(-1). The recoveries were in the range of 97.0%-98.3%. RSD was 2.7%. The method has been used to determination of trace silver in river water with satisfactory results.