石墨炉原子吸收光谱法测定铁/镍基高温合金中痕量砷

Determination of Trace Arsenic in Iron /Nickel Base Superalloy by Graphite Furnace Atomic Absorption Spectrometry

铁/镍基高温合金中的痕量砷的测定一般运用石墨炉原子吸收光谱法(GFAAS)。通过研究酸种类、干扰情况等方面对砷测定值的影响,同时对仪器测量条件进行优化改进,提高了砷测定的准确性和稳定性,得到了高温合金中痕量砷GFAAS测定的最佳分析条件为:波长193.7nm、狭缝宽度0.7nm、灯电流380mA、AA-BG、灰化温度900℃、原子化温度2000℃。改进后的分析方法对标准样品进行加标回收试验,回收率在95%～100%之间。进行准确度和精密度试验,分析结果与认定值相符,相对标准偏差<4%。结果表明,优化后的分析方法在测试分析中获得了比较满意的效果。

A method for determination of Arsenic in iron/nickel base superalloy by graphite furnace atomic absorption spectrometry was presented. Testing stability can improved and the veracity of analyzing results can be maintained by researching the effect of the type of acid and interference situation and ameliorating the measure conditions of instruments. The optimal conditions of determining arsenic with GFAAS have been obtained in iron/nickel base superaUoy： wavelength at 193.7 nm,slit width at 0.7 nm,lamp current of 380 mA,AA-BG,ashing temperature of 900℃,atomization temperature of 2000℃ o Recycling test for standard samples by the modified method indicated that recovery rate was between 95% and 100%. The analysis results were in line with found values and the relative standard deviation was less than 4% with the accuracy and precision tests. The results of tests indicated that the modified method has been used for practical analysis with satisfactory results.