Determination of Tin by Spectral Lines with Different Sensitivity of Alternating Current Arc Emission Spectroscopy
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摘要: 根据交流电弧发射光谱法具有可同时测定多个元素和多条谱线的优势，探讨了利用Sn的灵敏线(317.502 nm)和次灵敏线(285.062 nm)同时测定Sn含量范围跨度较大的样品。对GBZ-Ⅱ型光谱相板测光仪的软件工作条件进行特殊设置，通过灵敏线317.502 nm测定样品中x~xxμg/g的Sn，次灵敏线285.062 nm测定样品中0.0x%~x%的Sn。本方法同时测定两条不同灵敏度的分析谱线，兼顾了交流电弧发射光谱法具有较高灵敏度的优点，拓展了样品的测试范围，避免了传统方法中对高含量样品需进行稀释后再次测定可能带来的污染以及人为引入的误差。Abstract: Based on the advantages of simultaneous determination of multiple elements by using different spectral lines of Alternating Current Arc Emission Spectroscopy, samples with a large range of Sn contents were simultaneously determined by the major spectral line of 317.502 nm and the minor spectral line of 285.062 nm. The working condition for the GBZ-Ⅱ spectral phase plate light meter was optimized by improving the software function. The 317.502 nm spectral line was selected to measure x~xx μg/g Sn in the sample, while the spectral line of 285.062 nm was selected for the determination of 0.0x%~x% Sn. The established method can simultaneously detect two spectral lines with different sensitivities. According to the advantage of high sensitivity by the alternating current arc emission spectroscopy, the high Sn content sample can be analyzed without any dilution, which avoids contamination and artificial errors.
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Key words:
- Sn /
- Alternating Current Arc Emission Spectroscopy /
- two meters of grating
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表 1 谱线强度
Table 1. Intensity of the lines with the different concentration
w(Sn)/
(μg·g-1)相对黑度 317.502 nm 285.062 nm 0.28 -0.31 0.62 0.58 -0.27 0.61 1.1 -0.24 0.6 2.1 -0.19 0.7 5.1 0.33 0.92 10 0.56 0.95 20 0.88 0.92 50 1.44 0.91 100 1.82 0.93 200 1.98 1.13 500 2.52 1.15 3000 2.95 2.06 10000 2.68 2.32 
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表 2 不同谱线测定结果
Table 2. Determination results with the different lines
标准物质编号 w(Sn)/(μg·g-1) 标准值 317.502 nm 285.062 nm GBW 07310 1.4 1.45 33.3 GBW 07312 54 49.7 33.3 GBW 07311 370 348 406 模拟样品1 1452 500 1574 甘肃省二级标准10-06 4700 500 4606
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表 3 错误的条件设定
Table 3. The settings of incorrect condition
w(Sn)/(μg·g-1) 317.502 nm 285.062 nm 0.28 0.28 0.58 0.58 1.1 1.1 2.1 2.1 5.1 5.1 10 10 20 20 50 50 317.502 nm 285.062 nm 100 100 200 200 500 500 300 300 1000 1000 3000 3000 10000 10000
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表 4 正确的条件设定
Table 4. The settings of correct condition
w(Sn)/(μg·g-1) 317.502 nm 285.062 nm 0.28 - 0.58 - 1.1 - 2.1 - 5.1 - 10 - 20 - 50 - 317.502 nm 285.062 nm 100 - 200 200 300 300 500 500 - 1000 - 3000 - 10000
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表 5 方法准确度与精密度
Table 5. Accuracy and precision tests of the method
标准物质编号(分析线) w(Sn)/(μg·g-1) RE/% RSD/% 标准值 测定均值 GBW 07311(317.502 nm) 370 348 5.94 8.87 GBW 07311(285.062 nm) 370 406 -9.73 9.92 模拟样品1(285.062 nm) 1452 1584 -9.09 9.86 二级标准物质10-06
(285.062 nm)4700 4566 2.85 9.54
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