毛细管色谱直接进样法测定白酒中高碳脂肪酸乙酯的研究

介绍了采用ＦＦＡＰ键合毛细管柱直接进样测定白酒中５种高碳脂肪酸乙酯的方法，操作简捷，定量准确，检测限低达０４ｍｇ／Ｌ。用该法测定了各种香型近９０个白酒样品。改变色谱条件后，在一次直接进样分析中除能测定高碳脂肪酸乙酯外，而且还能对白酒中醇、酯、醛、酮以及有机酸等５２种香味组分进行定量测定，结果重现性良好。     

气相色谱-串联质谱法测定白酒中16种增塑剂

采用气相色谱-串联质谱法测定白酒中16种增塑剂的含量。样品经30℃水浴真空旋转蒸发10min去除乙醇后,用正己烷萃取,漩涡振荡1min,取上层有机相用TR-5MS色谱柱分离,选择反应监测扫描(SRM)模式测定。16种增塑剂的质量浓度在5~1 000μg·L-1范围内与其峰面积呈线性关系,检出限(3S/N)在5~15μg·kg-1之间。在50,100,500μg·kg-1等3个浓度水平进行加标回收试验,回收率在70.5%~120%之间,相对标准偏差(n=6)小于15%。     

真空离心浓缩/气相色谱-质谱联用法测定白酒中6种邻苯二甲酸酯类增塑剂

建立了测定白酒中6种邻苯二甲酸酯类增塑剂的真空离心浓缩/气相色谱-质谱联用(GC-MS)分析方法。样品经真空离心浓缩,正己烷提取,取上层正己烷,4000r/min离心5min,采用GC-MS测定,外标法定量。在0.10～5.00μg/mL范围内,相关系数r20.992,样品在0.10～2.00 mg/kg范围内加标,平均回收率在88.83%～111.67%之间,相对标准偏差(RSD)为4.85%～11.35%,检出限(LOD)在0.02～0.05 mg/kg之间。采用该方法对16个白酒样品进行测定,结果表明该法简便、快速、结果准确可靠、灵敏度高,能够满足白酒中6种邻苯二甲酸酯增塑剂检测需求。     

酒类中微量甲醛的快速测定新方法

在FeCl3存在条件下,甲醛与自制蛋白液显色剂能生成紫色化合物,藉此可以定量测定微量甲醛。方法线性范围为1~10μg/10mL,线性相关系数r2=0.996,检出限为0.05μg/mL。用该法测定经活性炭脱色的啤酒和白酒中的甲醛含量,回收率为96.46%~103.32%,相对标准偏差为1.36%~2.09%(n=6)。     

Irradiation of cane sugar spirit

The present study deals with the effect of irradiation on the gas-chromatographic profile of irradiated cane sugar spirit irradiated in glass containers in the presence of oak chops with doses of 0–10 kGy. Volatile constituents were analyzed in a CG gas chromatographer with a flame ionization detector using a Megabore CG-745 column. The results are discussed considering the contribution of irradiation to the quality of the spirit and the contribution of the irradiated oak wood.     

The spirit of capitalism,non-expected utility and asset pricing

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Co-detection of Copper and Lead in Artisanal Sugarcane Spirit Using Caffeic Acid-modified Graphite Electrodes

Caffeic acid (CA)-modified graphite electrodes [GE/poly(CA)] was applied to the co-detection of copper and lead in artisanal sugarcane spirit using square-wave anodic stripping voltammetry (SWASV). Electrochemical and morphological studies were performed, and a mechanism for polymerization was proposed. Electropolymerization, SWASV, and analysis conditions parameters were optimized. Interferents, repeatability, reproducibility, and addition and recovery tests were carried out. GE/poly(CA) shows a linear range from 15 to 705 μg/L with a limit of detection of 3.01 μg/L for Pb(II) and 4.50 μg/L for Cu(II). Real samples of artisanal sugarcane spirit were used, and the electrochemical results were compared with atomic absorption spectroscopy experiments.     

在无机化学教学中渗透科学精神的探讨与实践

无机化学是大一新生学习高等化学知识的重要课程,在教学中渗透科学精神对学生科学素养的培养具有重要的意义。在对实验班的教学中进行了渗透科学精神的实践,以电池材料化学史为脉络,采用案例教学法,引导学生思考并推进学习进程,在这个过程中渗透科学精神中的开拓进取的探索精神。这一渗透科学精神的教学实践对学生的科学思维和科学行为产生了正面影响,激发了学生探索求实、积极进取的学习热情。     

提升学生科研创新能力的应用化学专业实验课程教学体系建设

针对专业实验课程教学体系和教学方式进行了改革探索。从化学实验技能培养出发,以学生为主体,建立分层次的实验教学体系和开放的实验教学模式。在夯实学生的基础实验技能基础上,加强综合实验能力训练,逐步培养学生的科学研究意识和科学研究能力。