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本文提出了用火焰原子吸收光谱法测定维纶纺丝凝固浴中高含量硫酸钠(40%左右)。谱线选用锌的非吸收330.259/330.294nm双重线,其测定灵敏度比钠的次灵敏330.232/330.299nm谱线大为降低,能满足高含量、低稀释比的要求。对分析谱线的线性范围进行了观察,确定了最佳稀释比。从精度上对仪器的可选条件进行了选择,其仪器测量精度相对标准偏差±0.13%。样品模拟相对误差小于±0.31%,试样中标液加入回收率大于99.5%。试样10次吸样测定,相对标准偏差小于±0.52%,达到了高精度分析的要求。
In this paper, flame atomic absorption spectrometry was used to determine the content of sodium sulfate (about 40%) in polyvinyl alcohol spinning coagulation bath. The non-absorption of 330.259 / 330.294nm double line of zinc is selected for the line, its sensitivity is much lower than that of sodium sub-sensitive 330.232 / 330.299nm, which can meet the requirement of high content and low dilution ratio. The linear range of the analytical line was observed to determine the optimum dilution ratio. From the accuracy of the optional equipment conditions have been selected, the relative standard deviation of the instrument measurement accuracy of ± 0.13%. The relative error of the sample simulation is less than ± 0.31%, and the recovery rate of the standard solution in the sample is greater than 99.5%. The sample was sampled 10 times and the relative standard deviation was less than ± 0.52%, which met the requirements of high-precision analysis.