摘要
建立了静态顶空气相色谱峰面积A与顶空加热温度T、顶空加热时间t的二元函数方程。运用热力学原理推导出ln A=-k1/T+b1,并从动力学角度定性讨论了A与t的关系。对实验数据进行回归后发现:在气、液两相的挥发和冷凝速度相等前,各有机物A=k2ln t+b2;速度相等后A与t无关。据此建立了速度相等前A与t、T的二元函数方程A=[a1ln t-a2]/T+a3ln t+a4,并预测了水相中四氢呋喃、甲醇和非水体系中丙酮、四氢呋喃、乙酸乙酯、甲苯在不同T、t时的A。结果与实验测定数据吻合,建立的二元函数方程正确。
In this paper,by using the thermodynamic principles,the bidimensional function of the peak area of organic solvents with thermostatting temperature and thermostatting time was derived. According to the thermodynamic principles,the relationship between the peak area of chromatography with thermostatting temperature is ln A =- k1/ T ＋ b1. At the same time,the relationship between the peak area of chromatography with thermostatting time was qualitative discussed from the dynamics angle. By the experimental data regressing,the relationship between peak area of chromatography with thermostatting time is A = k2ln t ＋ b2before the speed of evaporation and condensation of organic compounds in the gas-phase and liquid-phase is equal; after the speed is invariant,the peak area is a constant and it is nothing to do with thermostatting time. Base on these results,the bidimensional function of the peak area with thermostatting time and temperature is A =[a1ln t- a2]/T ＋ a3ln t ＋ a4before the speed is invariant. The peak area of tetrahydrofuran,methanol in water and acetone,tetrahydrofuran,ethyl acetate,toluene in non-aqueous system can be forecasted with the different thermostatting temperature and time. The results were consistent with experimental data,it proved the bidimensional function equation is correct.
出处
《实验室研究与探索》
CAS
北大核心
2014年第3期45-50,54,共7页
Research and Exploration In Laboratory
基金
浙江省高校实验室工作研究项目(Y201250)
宁波市自然基金研究项目(2013A610093)
关键词
顶空加热时间
顶空加热温度
色谱峰面积
静态顶空气相色谱法
有机物
thermostatting time
thermostatting temperature
chromatography peak area
static headspace capillary gas chromatography
organic compounds
