1,2-萘醌-4-磺酸钠共振散射法测定痕量银  

Determination of trace silver by sodium 1,2-naphthoquinone-4-sulfonate resonance scattering method

作　　者：谭嵛心 刘符明 晏兴荣 陈方缘 邹金汕 翟好英[1] TAN Yu-xin;LIU Fu-ming;YAN Xing-rong;CHEN Fang-yuan;ZOU Jin-shan;ZHAI Hao-ying(College of Chemistry and Chemical Engineering,Neijiang Normal University,Neijiang 641112,China)

机构地区：[1]内江师范学院化学化工学院,四川内江641112

出　　处：《冶金分析》2018年第11期48-52,共5页Metallurgical Analysis

基　　金：四川省教育厅重点科研项目(15ZA0289)

摘　　要：以1,2-萘醌-4-磺酸钠为光谱探针,利用其与Ag(I)络合作用建立了一种共振散射法测定银含量的分析方法。在pH=5.0的Walpole(HCl-NaAc)缓冲溶液中,1,2-萘醌-4-磺酸钠溶液无明显的散射峰。当加入Ag+后,由于Ag+与1,2-萘醌-4-磺酸钠之间发生络合作用形成银络合物,使得体系在294nm处产生一个较强的共振射射峰。在最优的实验条件下,Ag+质量浓度在0.005 0～4.0μg/mL范围内与共振散射强度(ΔI)之间呈较好的线性关系;检出限为18.2ng/L。并且常见的金属离子和非金属离子不干扰Ag+的测定。该方法用于测定废胶片中痕量银,结果的相对标准偏差(RSD,n=5)为2.1%～4.8%,回收率为99%～101%,并与原子吸收光谱法(AAS)测定结果相吻合。An analysis method of silver content by resonance scattering was established using sodium 1,2-naphthoquinone-4-sulfonate as spectral probe based on its complexation action with silver.There was no obvious scattering peak for sodium 1,2-naphthoquinone-4-sulfonate solution in Walpole(HCl-NaAc)buffer solution at pH 5.0.After adding Ag+,a complex was formed due to the complexation between Ag+and 1,2-naphthoquinone-4-sulfonate,thus generating a strong resonance scattering peak at 294 nm.Under the optimal experimental conditions,there was a good linear relationship between the resonance scattering intensity(ΔI 294 nm)and the mass concentration of Ag+in range of 0.005 0-4.0μg/mL.The limit of detection was 18.2 ng/L.Moreover,the common metal ions and nonmetal ions had no interference with the determination of Ag+.The proposed method was applied for the determination of trace silver in waste film.The relative standard deviation(RSD,n=5)of results was 2.1%-4.8%.The recoveries were between 99%and 101%.The determination results of this method were consistent with those obtained by atomic absorption spectrometry(AAS).

关 键 词：银 共振散射 1 2-萘醌-4-磺酸钠 废胶片 

分 类 号：O657.31[理学—分析化学]