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采用悬浮液进样进行原子光谱测定,可以减少样品前处理和不用酸碱化学试剂,是一种绿色化学的发展方向。本文采用表面张力仪对聚丙烯酸钠、聚氧化乙烯、六偏磷酸钠、柠檬酸三钠等表面活性剂与铅锌矿粉末组成悬浮液的表面张力进行测定,利用火焰原子吸收光谱法的雾化装置进行了雾化效率的考察和优化选择。随着表面活性剂浓度的增加,水溶液和悬浮液的雾化效率均增大,当达到一定浓度时,雾化效率增幅趋缓并达到最大值,不同表面活性剂具有不同变化趋势。对于聚氧化乙烯制备的悬浮液,在2 g/L浓度时具有最高的雾化效率;而聚丙烯酸钠在5 g/L浓度时具有更高的雾化效率,可达20%。表明表面活性剂能改善悬浮液的稳定性并提高雾化效率,可以应用于原子光谱的测定。
The use of suspension injection atomic spectrometry, sample preparation can be reduced and without acid-base chemical reagents, is a green chemical development. In this paper, the surface tensiometer was used to measure the surface tension of the suspension consisting of sodium polyacrylate, polyethylene oxide, sodium hexametaphosphate, trisodium citrate and other surfactants and lead-zinc ore powder. The flame of atomic absorption spectrometry The device has been atomization efficiency of inspection and optimization options. With the increase of surfactant concentration, the atomization efficiency of aqueous solution and suspension increased. When a certain concentration was reached, the increase of atomization efficiency slowed down and reached the maximum. Different surfactants had different trend. For polyoxyethylene-made suspensions, the highest atomization efficiency was achieved at a concentration of 2 g / L; whereas sodium polyacrylate had a higher atomization efficiency of up to 20% at a concentration of 5 g / L. It shows that the surfactant can improve the stability of the suspension and improve the atomization efficiency, which can be applied to the determination of atomic spectroscopy.