用纯化合物确定热重质谱联用质谱CO_2响应因子

Calibration of Carbon Dioxide Signal from Mass Spectra in Thermal Gravimetry/Mass Spectrometric System by Pure Compounds

利用纯化合物KHCO3 的热分解 ,测定了热重质谱联用系统用于质谱定量CO2 的响应因子 ,考察了载气流速、升温速率和试样量等热重操作条件对响应因子定量的影响 ;在限定的线性条件下 ,用该响应因子进行的定量结果与理论计算之间的误差在 3%～ 5

The response factor of CO 2 for mass spectral (MS) signal in a thermal gravimetry/mass spectrometric (TG/MS) system was determined by decomposition of KHCO 3. The influence of TG operation parameters included flow rate of carrier gas, heating rate and sample weight on the shape and intensity of MS signal has been investigated.The accuracy of this method was tested for pure compounds of NaHCO 3, CaC 2O 4·H 2O and CaCO 3. Comparing with the theoretical values, the relative error of this method is about 3%～5%.