【摘要】 采用钨丝探针电解预富集 石墨炉原子吸收法测锡 ,兼有电解预富集和探针原子化的优点。对电解液组成、溶液pH值、电解电压、富集时间等实验条件进行了优化。方法检出限达到 0 .0 8μg L ;相对标准偏差为 5 .6 %。应用于罐头食品中痕量锡的测定 ,结果满意。初步探讨了锡在电沉积后的原子化机理。更多还原

【Abstract】 A new method for the determination of Sn by graphite furnace atomic absorption specrometry after electrodeposition on a tungsten probe has been developed. It is advantageous for both the preconcentration and the separation of Sn from the matrix. Conditions for the electrodeposition, such as the component of electrolyte, pH of solutions, the deposition potential, the time of electrolysis and the temperature of ashing and atomization, were optimized. The ashing temperature is increased observably. The detection limit for Sn is 0.08 μg/L for a 200s deposition and the relative standard deviation is 5.6%.This method has been applied for the determination of trace tin in canned food. The atomization mechanism of Sn after electrodeposition on tungsten probe has also been discussed.更多还原