火焰原子吸收法测定含银敷料中银含量

本方法研究了用微波消解仪消解含银敷料以及用火焰原子吸收法测定敷料中银含量的最佳条件。结果表明,1g含银敷料,采用12m L硝酸和2m L双氧水混合液,在600W微波条件下,200℃,10min可完全消解。采用空气—乙炔贫燃火焰原子吸收法测定银含量,线性范围0—5mg/L,检出限0.0021mg/L,加标回收率在98.36%—102.1%之间,相对标准偏差1.41%,该方法适用于含银敷料的批量检测。

Optimum conditions of digesting silver-ion dressing by microwave digestion instrument and optimum conditions of measuring silver-ion content in dressing by lfame atomic absorption spectrometry were studied in this method. Result shows that: under condition of 600W microwave heating , 1 gram silver-ion dressing can be completely digested in 10 minutes by using mixture of 12ML nitric acid and 2ML hydrogen peroxide. By using Air-acetylene Lean-burn Flame Atomic Absorption Spectrometry to measure silver-ion content, the result is that linear range 0-5mg/L, detection limit 0.0021mg/L, recovery of standard addition 98.36%--102.1%, relative standard deviation 1.41%, showing this method is suitable for batch inspection on silver-ion dressing.