当前位置: X-MOL 学术Microchem. J. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Photoacoustic spectroscopy with mica and graphene micro-mechanical levers for multicomponent analysis of acetic acid, acetone and methanol mixture
Microchemical Journal ( IF 4.8 ) Pub Date : 2019-01-01 , DOI: 10.1016/j.microc.2018.08.034
Jan Suchánek , Pavel Janda , Michal Dostál , Antonín Knížek , Pavel Kubát , Petra Roupcová , Petr Bitala , Václav Nevrlý , Zdeněk Zelinger

Abstract Multilayer graphene and mica cantilevers as part of an optical microphone in combination with CO2 laser emitting in the range of 9–11 μm were employed in a multicomponent analysis of a mixture of acetone, acetic acid and methanol by photoacoustic spectroscopy. Using these elements, the detection limits of mica circle cantilever were 0.54, 0.80 and 24.8 ppm for acetic acid, methanol and acetone, respectively; these limits were approximately 5 times lower than the detection limit of the highest-class microphone used in this study. The multicomponent analysis was performed using five selected CO2 laser lines and a classical method of least squares. Despite the inaccuracies of our system, very good agreement between the concentration of acetic acid calculated from the photoacoustic signal and from weighing of concentration standards (~3%) was found when measuring the signal in a 10:1:1 mixture of acetone:acetic acid:methanol at five selected laser lines. The absorption coefficient of acetic acid at 10.24 μm was almost 500 times higher than that of acetone, which showed the good ability of this method to detect acetic acid in a high background of acetone, which can be beneficial in the medical analysis of breath.

中文翻译:

使用云母和石墨烯微机械杠杆进行乙酸、丙酮和甲醇混合物多组分分析的光声光谱

摘要 多层石墨烯和云母悬臂作为光学麦克风的一部分,结合发射 9-11 μm 范围内的 CO2 激光,通过光声光谱法对丙酮、乙酸和甲醇的混合物进行多组分分析。使用这些元素,云母圆悬臂梁对乙酸、甲醇和丙酮的检测限分别为 0.54、0.80 和 24.8 ppm;这些限制比本研究中使用的最高级别麦克风的检测限制低大约 5 倍。使用五个选定的 CO2 激光线和最小二乘法的经典方法进行多组分分析。尽管我们的系统不准确,当在 10:1:1 的丙酮:醋酸:甲醇混合物中用五个选定的激光测量信号时,发现根据光声信号计算的醋酸浓度与浓度标准的称重 (~3%) 之间非常吻合线。醋酸在 10.24 μm 处的吸收系数几乎是丙酮的 500 倍,表明该方法在丙酮高背景下检测醋酸的能力良好,可用于呼气的医学分析。
更新日期:2019-01-01
down
wechat
bug