分光光度法测定卷烟主流烟气中氰化物的研究

Research on Spectrophotometric Determination of Cyanide in Mainstream Smoke

[目的]研究卷烟主流烟气中氰化物含量的测定方法，同时对烟气补集装置进行改进。[方法]以0.2mol／LNaOH为吸收液，采用改进的烟气捕集装置捕集卷烟主流烟气中氰化物，然后在酸性介质中蒸馏分离，将捕集液中氰化物以HCN形态蒸出，再用1％（m／V）NaOH溶液吸收馏出液。馏出液中氰化物含量采用间接分光光度法测定。[结果]CN^-质量浓度在0-0．8mg／L范围内符合比耳定律，检出限为0．02mg/L，工作曲线相关系数0．999。用于实际样品分析，方法相对标准偏差为0.6％-1.7％，加标回收率为84．46％-108％。[结论]分光光度法满足卷烟主流烟气中HCN的研究，改进后的装置吸收效果令人满意。

[Objective] The research aimed to study the determination method of cyanide in mainstream smoke and improvement of mainstream stroke absorption device, [ Method] Cyanides in mainstream smoke were trapped by the adoption of improved gas trap with 0.2 mol/L NaOH as absorption solution. HCN was steamed out from the cyanide in the trapping solution after distillation separation in acid medium and then absorbed by 1% （m/V） of NaOH solution. Cyanides in the distillate were determined by indirect spectrophotometry. [ Result] Beer＇s law held in the quality concentration range of 0 - 0.8 mg/L of ion CN^- with 0.02 mg/L of the detection limit and the correlation coefficient 0.999 of calibration crave. The relative standard deviation of the actual samples determination results were 0.6% - 1.7% and the recoveries of standard addition were 84.46% to 108%. [ Conclusion] The spectrophotometry could be used to determine the content of cyanide in mainstream smoke. And the effect of the improved device was satisfactory.