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对银的流动注射氨性样品溶液注入蒸气发生原子吸收光谱分析方法进行了初步研究。观察到银可在流动注射氨性样品溶液注入蒸气发生条件下生成挥发性气态物质。经过对银蒸气态物质发生的化学条件 ,如样品溶液中氨的浓度 ,载流溶液的酸度 ,硼氢化钠浓度等 ,以及流动注射参数 ,如反应管道长度 ,载流和试剂溶液流速 ,载气流速等的优化 ,初步建立了银的氨性样品溶液注入流动注射蒸气发生原子吸收光谱分析方法。在 50 0 μL试样体积和 1 2 0样品 /h的采样频率下得到银的检出限 ( 3σ)是 1 5μg/L ,RSD为 2 6% ( 1 0 0 μg/L ,n =1 1 )。初步研究了共存离子的干扰。自来水 ,水库水中加入银的回收率为 1 0 0 %～ 1 0 2 %。用标准加入法对定影废液中的银进行测定 ,并与火焰原子吸收测定进行对照 ,结果基本相符。
The method of atomic absorption spectrometry for the injection of ammonia into the silver by flow injection was studied. It is observed that silver can generate volatile gaseous species under the conditions of steam injection by flow injection of ammonia sample solution. After the chemical conditions of the silver vapor, such as the concentration of ammonia in the sample solution, the acidity of the carrier solution, the concentration of sodium borohydride and so on, as well as the flow injection parameters such as the length of the reaction tube, carrier and reagent solution flow, Speed optimization, the initial establishment of a silver ammonia sample solution injection flow injection vapor generation atomic absorption spectrometry method. The detection limit (3σ) of silver at 150 μL sample volume and sample rate of 120 samples / h was 15 μg / L with RSD of 26% (100 μg / L, n = 1 1 ). Preliminary study of the interference of coexisting ions. Tap water, reservoir water added silver recovery rate of 100% ~ 102%. The standard addition method was used to determine the silver in the fixing waste liquid and compared with the flame atomic absorption spectrometry. The results were basically consistent.