卷烟纸中CaCO_3的定量方法比较及形貌表征研究

Quantitative Determination of CaCO_3 in Cigarette Paper and Its Morphological Characterization

分别采用煅烧法、电位滴定法及络合滴定法定量测定3种卷烟纸中CaCO3的含量,发现煅烧温度和时间对煅烧法的测定结果影响很大,当煅烧温度为900℃,煅烧2 h时卷烟纸中的纤维可完全氧化分解;电位滴定法和络合滴定法的结果具有较高的稳定性,但卷烟纸中的金属氧化物和碳酸盐易给电位滴定法带来误差,络合滴定法通过遮蔽剂可消除杂质离子的影响,具有较高的准确性。对3种卷烟纸灰分的XPS分析结果表明,灰分中除CaO外,还含有C、Na2CO3、Na2SiO3、Na3PO4、CaSiO3、Ca3(PO4)2等物质;SEM分析结果表明CaCO3呈纺锤状微晶和团簇状体分布在纤维中。该研究结果提供了一种比较准确的定量测定纸张中CaCO3含量的方法。

Calcination,potentionmetric titration and compleximetry titration methods are used to determine the contents of CaCO3 in three cigarette papers,the results indicate that the measuring results by calcination are evidently influenced by the calcining heat and calcining time,which has adverse effect for the accuracy.Fiber in the papers are oxidized totally when the cigarette papers are calcined in the condition of 900 ℃ for 2 h.The measuring results by potentionmetric titration and compleximetry titration are rather stable,while the metallic oxides and carbonates in the cigarette papers bring errors for the measuring results by potentionmetric titration method.The impurity ions in the cigarette papers are sheltered by covering reagent in compleximetry titration,so the accuracy of the measuring results is high.The XPS analyzing results show that the CaO is the main component in the ashes of three cigarette papers,and the other chemical compounds such as C,Na2CO3,Na2SiO3,Na3PO4,CaSiO3,Ca3（PO4）2 are also checke.The SEM analyzing results show that the CaCO3 distribute in the fibres exhibits spindle-shaped microcrystallite and spheric cluster.This study presents an accurate method to determine the content of CaCO3 in paper.