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正铬(Cr)元素常以三价铬(Cr~(3+))和六价铬(Cr~(6+))的形态存在,在自然界中分布广泛。Cr~(3+)在人体正常糖脂代谢中是必不可少的微量元素,缺少Cr~(3+)可能会引发多种疾病;Cr~(6+)由于其氧化性和对皮肤的高渗透性,毒害性较大,被确认具有致癌作用[1]。烟用接装纸是香烟吸食过程中与口腔密切接触的部分,其安全性影响卷烟产品的整体质量安全,因此,针对卷烟产品中Cr~(6+)的含量进行质量监控很有必要。 相似文献
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高效液相色谱-蒸发光散射检测法测定烟草中的水溶性糖 总被引:20,自引:0,他引:20
采用Waters高效糖分析柱,梯度洗脱分离,建立了高效液相色谱-蒸发光散射检测法(HPLC—ELSD)同时测定烟草中水溶性糖的新方法。乙腈-水为流动相,流速1.0mL/min,柱温30℃,蒸发光散射检测器漂移管温度80℃,氮气作载气,流速2.00L/min。水溶性糖的线性范围:鼠李糖、果糖、葡萄糖、蔗糖0.5—30μg,检出限低于12.5ng;木糖、阿拉伯糖、甘露糖、麦芽糖0.5—20μg,检出限低于25.0ng。8种水溶性糖的加标回收率范围为86.0%~102.4%;相对标准偏差(n=5)皆小于4.1%。 相似文献
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建立了纸张中的20种芳香胺的分散固相萃取/气相色谱-三重四极杆串联质谱分析方法。纸张中的偶氮染料于(70±2)℃经预处理后还原为芳香胺,向反应后的悬浮液中先加入4 mL 10 mol/L氢氧化钠溶液,将pH值由弱酸性调至碱性,再加入0.5 mL的3内标(氘代萘、2,4,5-三氯苯胺和氘代蒽)工作溶液、10 mL的叔丁基甲醚,最后加入15 g无水硫酸钠除水,振摇40 min萃取芳香胺。萃取液经分散固相萃取试剂盒(d-SPE)进一步净化、离心后,取上层清液以气相色谱-三重四极杆串联质谱法(GC-MS/MS),在多反应离子监测(MRM)模式下检测,内标法定量。目标物在各自浓度范围内线性关系良好(r~20.99),在10、20、50 ng/mL 3个加标水平下的回收率为80.7%~128%,相对标准偏差(RSDs)为0.79%~6.5%,检出限(LOD)为0.05~2.1 ng/mL,定量下限(LOQ)为0.18~5.5 ng/mL。该方法简便快捷,灵敏度高,可用于纸张中芳香胺的快速检测。 相似文献
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The natural plant fiber has a large molecular weight and complex structure and composition,and its thermal cracking products and the composition distribution are also more complex. The fast pyrolysiscomprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry(Py-GC×GC-TOF/MS),thermogravimetry-Fourier transform infrared spectroscopy(TG-FT-IR),and in situ Fourier transform infrared spectroscopy(in situ FT-IR)methods were used to study the thermal pyrolysis process of six different natural fibers. The distribution of thermal pyrolysis products of different fibers under different pyrolysis temperatures was investigated and the product form was fully discussed. The research results show that the products of fiber pyrolysis mainly include alcohols,aldehydes,ketones,acids,esters,hydrocarbons, dehydrated sugars and CO2,etc. The types of pyrolysis products of different natural plant fibers are obviously different,and the main product types obtained are all different. At the same time,the results of in situ infrared spectroscopy and mass spectrometry show that pyrolysis products are closely related to the pyrolysis temperature. The results of in situ infrared experiments show that when the pyrolysis temperature is lower than 100 °C,the adsorbed water on the surface of the fiber structure is desorbed,but the fiber structure does not change significantly. When the pyrolysis temperature range is 100~200 °C,the temperature has little effect toward the pyrolysis process. When the temperature exceeds 300 °C,the fiber pyrolysis reaction intensifies and the surface structure changes significantly,and the main products are aldehydes and ketones. © 2022, Science Press (China). All rights reserved. 相似文献
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称取电子烟烟液样品0.100 0g于25mL具盖离心管中,加入15%(体积分数)异丙醇溶液10mL,溶解混合,静置后作为样品溶液。如果在静置过程中出现不完全混溶现象,可将离心管置于涡旋振荡器内,以5 000转·min~(-1)的转速振荡1min,离心后,取澄清液体作为样品溶液。用连续流动分析仪测定样品溶液在波长460nm处的吸光度。烟碱的质量浓度在10.0~500mg·L~(-1)内与其对应的吸光度呈线性关系,测定下限(10s)为1.5mg·L~(-1)。方法用于测定市售电子烟烟液中的烟碱,测定值与标记值基本相符,加标回收率在99.5%~101%之间,测定值的相对标准偏差(n=6)为0.66%。 相似文献
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