烟气中有机酸的分析

 应用甲酯衍生化试剂对卷烟烟气粒相物中有机酸进行甲酯衍生化 ,经固相微萃取 (SPME)后通过气 质联用仪分离鉴定。分析了 4个品牌的卷烟烟气 ,共鉴定了 60多种挥发及半挥发性有机酸。对丁酸、己酸、糠酸、辛酸、壬酸、苯甲酸、苯乙酸、十四酸、十六酸进行了定量分析。该方法用于烟气中有机酸的定性、定量分析 ,灵敏度较高 ,快速简便。     

高效液相色谱法测定卷烟烟气总粒相物中的烟碱

采用反相高效液相色谱内标法测定卷烟烟气总粒相物中的烟碱含量,内标物为对氨基苯碘酸,方法的平行回收率为９９．７％～１００．１％,精密度好,操作简便、快速,可作为检测烟碱的一种可靠方法。     

2-异丙基-3-羟基-3-甲基-3-吡嗪丙酸乙酯的合成及其对卷烟烟气增香的研究

以乙酰基吡嗪和异戊酸乙酯为原料,合成了2．异丙基-3-羟基-3-甲基-3-吡嗪丙酸乙酯(1)。其结构经^1H NMR和MS表征。加香评吸实验表明其对烤烟型卷烟的香气有很好的提升作用,可以掩盖杂气,余味更舒适。烟气分析结果证明,1是一种前体香料,在燃烧状况下能发生裂解反应,释放出乙酰基吡嗪。     

N-B级数的Fejer和的渐近公式(英文)

设ｆ（ｚ）是单位圆周Г上的有界变差函数,且它的两个单侧导数在点ｚ0∈Г存在,本文给出它的Ｎ－Ｂ级数的Ｆｅｊｅｒ和在ｚ０处的渐近公式．     

流动注射-氢化物发生原子吸收光谱法测定香烟接装纸中的痕量砷

将流动注射-氢化物发生和原子吸收光谱法有机的结合起来,探讨了流动注射-氢化物发生-原子吸收光谱法测定香烟接装纸中砷的最佳条件。样品经消解后,加入还原剂,使五价砷还原为三价,在盐酸介质中和硼氢化钾反应生成砷化氢,进入电热石英管原子化测定。检测结果相对标准偏差小于5%,加标回收率为96.7%~104%,方法检出限为0.18μg/L。     

流动注射-氢化物发生-原子吸收光谱法测定香烟接装纸中的痕量铅

研究了流动注射-氢化物发生-原子吸收光谱法测定香烟接装纸中铅含量的分析方法.讨论了氢化物发生的最佳条件,方法的回收率为95%～104.5%,检出限可达0.22 ng/mL,线性范围在0～50 ng/mL,线性回归方程为y=0.012x 0.0106,相关系数γ=0.9997,相对标准偏差在1.2%～3.3%.     

近红外光谱法测定卷烟中多酚类物质含量的研究

利用烟草样品的近红外漫反射光谱,通过化学计量学的方法,建立了卷烟中多酚类物质的近红外数学模型.结果表明,绿原酸、新绿原酸和芸香苷近红外数学模型外部验证的平均相对误差和变异系数(RSD)均在5%以内,说明该模型准确性和稳定性均很好,可以用来快速、准确,无污染地测定卷烟中多酚类物质含量.     

Stratonovich Anticipative Stochastic Differential Equations In The Plane

We apply the techniques of the quasi-sure analysis to prove that the stochastic differential equation in the plane with smooth and nondegenerate initial condition can be solved     

烟草中自由基的研究进展

自由基是卷烟烟气中主要的一类有害物质，能导致人体组织和细胞的氧化，损害细胞膜上的脂类和蛋白质。引发癌症等疾病。对烟草中自由基的研究情况、自由基的检测方法、降低卷烟中自由基含量的研究等方面进行了综述。     

Evaluation of solid sorbents for the determination of di-butylphthalate and di-2-ethylhexylpthalate in drinking water

The aim of this paper is to test the feasibility of multiwalled carbon nanotubes (MWCNTs) and cigarette filters (CGFRs) as solid adsorbents for pre-concentration of DBP and DEHP in water; and to compare with C₁₈ to investigate which has the best enrichment factor. It was found that cigarette filters exhibited the better recoveries and were therefore the best solid sorbent of the three materials tested, while multiwalled carbon nanotubes were unsuitable for enriching DBP and DEHP on account of its low recoveries. Parameters that may influence the extraction efficiency such as the eluent volume, sample flow rate, sample pH, and the sample volume were optimized. The results showed that the precisions (relative standard deviation, RSD) were 1.40% and 1.72% for DBP and DEHP under the optimal conditions. The detection limits of the developed method could reach 3.1 ng L^?1 and 4.3 ng L^?1 for DBP and DEHP, respectively, based on the ratio of the chromatographic signal to base line noise (S/N?=?3). Satisfactory results were achieved when the proposed method was applied to determine the two target compounds in drinking water with spiked recoveries in the range of 93.6–98.7%. The results indicated that CGFR was a significantly better sorbent to enrich DBP and DEHP in drinking water than the other solid sorbents.