摘要：本文通过考察消解体系、优化灰化温度、基体改进剂硝酸钯和抗坏血酸的浓度、原子化温度，建立了一种利用赛默飞ICE 3400 石墨炉原子吸收光谱仪测铊的分析方法，显著降低了土壤基体干扰。结果表明，在灰化温度 700℃、原子化温度 2000℃、硝酸钯浓度 200 mg/L、抗坏血酸浓度30 g/L的条件下，该方法的检出限为0.1 mg/kg，测定下线为0.4 mg/kg；采用标准物质和红棕黏土、黄棕色砂壤土、浅棕色砂壤土类型的实际样品进行准确度和精密度的验证，标准物质的测定值均在标准值范围内，相对误差在-1.9 % - 2.0% 之间，实际样品的精密度在 7.0 % - 9.2 % 之间。

Abstract: An analytical method for thallium determination by Thermo Fisher ICE 3400 graphite furnace atomic absorption spectrometer was established by investigating the digestion system, optimizing the ash temperature, the concentration of palladium nitrate and ascorbic acid, and the atomization temperature. The results showed that the detection limit of this method was 0.1 mg/kg and the detection line was 0.4 mg/kg under the conditions of ash temperature 700 ℃, atomization temperature 2000 ℃, palladium nitrate concentration 200 mg/L, ascorbic acid concentration 30 g/L; The accuracy and precision of the reference material and the actual samples of red brown clay, yellow brown sandy loam and light brown sandy loam were verified. The measured values of the reference material were all within the range of the standard value, the relative error was between-1.9% and 2.0%, and the precision of the actual samples was between 7.0% and 9.2%。