Application of Carbon-loaded Polyurethane Foam Produced by Ethanol Media in Determination of Gold in Geological Samples
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摘要: 载炭泡塑相较于无负载泡塑，可有效提高泡塑对金的吸附能力，但现有制备载炭泡塑的方法制备效率不高。为了缩短制备载炭泡塑的时间，提高制备效率，本文采用活性炭-乙醇溶液制备载炭泡塑，通过优化制备条件，包括负载介质的种类、试剂浓度、浸泡时间，使得制备100个载炭泡塑的时间可以控制在30 min之内，并结合ICP-OES建立了测定地质样品中金的方法。实验结果表明：该方法的振荡时间可以缩短至20 min。金的质量浓度在0~100.00 μg/mL范围内与光谱强度呈良好的线性关系，相关系数为0.9997，方法检出限（3σ）为0.0066 μg/g，测定结果相对标准偏差为0.81%~2.11%（n=10）。该方法经4个国家标准物质验证，准确度与精密度良好，能够满足地质样品中金的分析测试要求。
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关键词:
- 地质样品 /
- 金 /
- 载炭泡塑 /
- 制备效率 /
- 电感耦合等离子体发射光谱法
Abstract:BACKGROUND Compared with unloaded polyurethane foam, carbon-loaded polyurethane foam can effectively increase the adsorption capacity of gold, but the existing preparation method of carbon-loaded polyurethane foam is not efficient. OBJECTIVES To shorten the preparation time of carbon-loaded polyurethane foam, improve the preparation efficiency, and optimize experimental conditions. METHODS Activated carbon-ethanol solution was used to prepare carbon-loaded polyurethane foam. By optimizing conditions such as the load medium type, reagent concentration, and soaking time, the time for preparing 100 carbon-loaded polyurethane foams can be reduced to under 30 min. A method for the determination of gold in geological samples by Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) combined with carbon-loaded polyurethane foam is described. RESULTS The experimental results show that the oscillation time can be shortened to 20 min. The mass concentration of gold has a good linear relationship with the spectral intensity in the range of 0-100 μg/mL with the correlation coefficient of 0.9997. The detection limit (3σ) is 0.0066 μg/g, and the relative standard deviations of the results are 0.81%-2.11% (n=10). CONCLUSIONS Four certified reference materials of gold ore are used to evaluate the method. The results show good accuracy and precision, and the method meets the requirements of geological sample analysis. -
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表 1 不同方式制备的载炭泡塑对活性炭的吸附容量q和稳定吸附容量qs
Table 1. The activated carbon adsorption capacity and stable adsorption capacity by different methods
负载方法 q(mg/g) qs(mg/g) 需清洗的次数 方法① 389 15.2 19 方法② 402 14.8 21 方法③ 415 15.2 23 
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表 2 泡塑在活性炭-水溶液和活性炭-乙醇溶液中的q和qs
Table 2. The adsorption capacity of polyurethane foam in activated carbon-water and activated carbon-ethanol solutions
活性炭浓度(g/L) 活性炭-水溶液 活性炭-乙醇溶液 q(mg/g) qs(mg/g) q(mg/g) qs(mg/g) 搅拌
2 min搅拌
5 min搅拌
10 min搅拌
20 min搅拌
30 min搅拌
60 min搅拌
2 min搅拌
5 min搅拌
10 min搅拌
20 min搅拌
30 min搅拌
60 min0.5 38.7 40.4 41.5 43.0 43.2 42.8 15.0 14.6 6.8 0.4 0.5 0.4 0.4 15.1 1.0 49.1 64.4 80.3 87.6 85.3 87.2 15.2 33.1 18.1 6.7 6.3 6.6 6.3 14.9 2.5 89.7 99.7 113.5 119.2 119.2 118.5 15.1 57.4 26.9 8.3 8.1 8.2 8.3 15.2 5.0 131.2 149.9 166.7 172.3 171.3 172.5 14.9 86.8 40.5 10.3 10.8 11.1 10.7 14.8 10 145.4 160.1 208.9 215.7 213.8 214.4 15.0 143.5 67.4 18.6 18.1 18.3 18.4 15.0 25 195.0 220.0 234.6 238.2 236.0 237.4 15.1 301.7 111.1 34.1 32.8 33.6 33.2 15.1 50 241.0 270.2 271.5 272.3 273.9 272.6 15.1 402.4 143.6 40.2 39.6 40.1 39.1 14.9
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表 3 方法准确度和精密度
Table 3. Accuracy and precision tests of the method
标准物质编号 Au含量(μg/g) RSD(%) 测定值 平均值 认定值 GBW07808 3.28 3.11 3.12 3.22 3.17
3.29 3.23 3.29 3.27 3.193.22 3.2 2.11 GBW07809 10.42 10.58 10.41 10.26 10.37
10.55 10.34 10.63 10.62 10.4810.47 10.6 1.21 GBW07297 17.94 18.26 18.05 18.31 18.26
18.34 18.21 17.86 17.92 18.1618.13 18.3 0.97 GBW07298 32.15 31.88 32.46 32.24 32.47
31.93 32.58 32.11 31.84 32.0832.17 32.3 0.81
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