快速气相色谱法测定蔬菜中菊酯类农药残留量

采用一种较快速，简单的方法测定蔬菜中菊酯类农药残留物。样本中农残经乙酸酯萃取，凝胶渗透色谱及固相提取净化后，用气相色谱－电子捕获检测器测定，色谱柱为ＨＰ－５小口长石英毛细管柱。本法对６种常用菊酯类农药的回收率范围为８９．６％－９９．７％，检测限为０．０４ｍｇ／ｋｇ。对同一批普施用菊酯类农药的白菜样本进行化验，本法跟美国食物及药品管理局农药残留标准测定方法所得结果非常吻合。     

超声波提取-气相色谱-质谱联用法测定苏丹红Ⅰ残留量

研究了苏丹红Ⅰ的气-质联用检测方法。样品中的苏丹红Ⅰ用超声波提取,采用选择离子(SIM)方式,据保留时间和特征离子丰度比对其进行确证。此方法可以在13 min之内定性和定量地快速检测苏丹红Ⅰ残留,通过多次试验验证,添加量为0.01~1.00μg,回收率在82%~97%之间,相对标准偏差小于5%,检出限为6.0×10-4μg/g。     

中药材中有机磷类农药残留量的GC-PCI-MS法测定(Ⅰ)

采用气相色谱-正化学电离-质谱法对中药材中有机磷农药残留进行检测方法的研究；应用选择离子监测(SIM)技术，排除了杂质的干扰，提高了分析灵敏度；建立了有效、实用的有机磷农药残留量的检测方法。     

毛细管气相色谱法测定水体及土壤中溴氟菊酯农药的残留量

建立了新品农药溴氟菊酯在水体及土壤中残留量的测定方法，采用石油醚＋丙酮（３＋１）混合溶剂提取，经浓硫酸＋无水乙醇（１＋１）纯化，用毛细管气相色谱电子捕获检测器测定。该法检出限为０．１×１０－９～２×１０－９，回收率７２．６％～１００．５％，变异系数１．６％～８．５％。     

气相色谱法测定花生油中微量多氯联苯(PCB)

本文采用液－液萃取技术提取花生油中微量多氯联苯，用毛细管柱气相色谱法进行测定。整个过程只需３２ｍｉｎ，本方法最低检出限为１．００μｇ／ｋｇ     

Theoretical Studies on the Molecular Structures and Thermodynamic Properties of Polychlorinated Fluorenes

Geometric structures of 135 polychlorinated fluorene (PCFR) molecules were optimized using density functional theory (DFT) at the B3LYP/6-311G** level and their thermodynamic properties in the ideal gas state were calculated. The relations of these thermodynamic properties with the number and position of chlorine atoms were also explored, from which the relative stability of PCFR congeners was theoretically proposed according to the magnitude of the relative standard Gibbs free energy of formation (Δr,fGθ). The results show that the geometric configuration of PCFR isomers is determined by the position of chlorine atoms. There exist two types of intramolecular weak interactions, i.e., C-H···Cl and Cl···Cl interactions in PCFR molecules. The change of ΔfHθ and ΔfGθ of most stable PCFR isomers with increasing the number of chlorine atoms is different from that in most unstable PCFR congeners. The values of ΔfHθ and ΔfGθ for PCFR isomers with the same number of chlorine atoms strongly depend on the position of chlorine atoms and the relative stability of PCFR congeners is mainly determined by intramolecular delocalized π bond and Cl···Cl nuclear repulsive interaction.     

高效液相色谱法快速测定板栗中戊唑醇的残留量

建立了反相液相色谱法测定板栗中戊唑醇残留量的分析方法。以甲醇作为提取液,经分散离心后,上清液过0.22μm滤膜,HPLC分析,采用外标法定量。结果表明:戊唑醇浓度在0.1～10.0 mg/L范围内与色谱峰面积呈线性关系,相关系数r=0.9979。板栗中戊唑醇加标回收率在79.8%～93.9%之间,测定结果的相对标准偏差为2.3%～8.9%(n=5),检出限为0.079 mg/kg。该方法满足板栗进出口检测要求。