顶空-气相色谱法测定土壤和沉积物中丙烯酸酯类化合物

提出了顶空-气相色谱法测定土壤和沉积物中丙烯酸甲酯、丙烯酸乙酯、甲基丙烯酸甲酯、丙烯酸丙酯和丙烯酸丁酯等5种丙烯酸酯类化合物含量的方法。分别选择70℃及20 min作为样品在顶空瓶中的平衡温度和平衡时间。用HP-INNOWAX毛细管色谱柱（30 m×0.32 mm,0.32μm）分离,氢火焰离子化检测器测定。5种丙烯酸酯类化合物在9 min内能完全分离。5种丙烯酸酯类化合物的质量分数在20.0～2000μg·kg^-1范围内与其峰面积呈线性关系,检出限（3S/N）在2.0～10.0μg·kg^-1之间。方法用于土壤和沉积物样品分析,加标回收率在86.8%～104%之间,测定值的相对标准偏差（n=6）在3.5%～5.4%之间。     

顶空气相色谱法同时测定生活饮用水中17种挥发性卤代烃

建立了顶空气相色谱法同时测定生活饮用水中17种挥发性卤代烃的分析方法。样品采用自动顶空进样技术，经DB–5毛细管色谱柱（30 m×0.32 mm,0.25μm）分离后，用电子捕获检测器检测。优化样品保存条件为加入0.5 g抗坏血酸，冷藏避光保存。优化顶空条件：平衡温度为70℃，平衡时间为30 min,NaCl添加量为2.5 g。使用4-溴氟苯作为质控物质，保证测定结果的准确性。17种挥发性卤代烃的标准曲线相关系数均不小于0.998，方法检出限为0.003～2μg/L，平均回收率为85.7%～105.7%，测定结果的相对标准偏差为1.0%～5.6%(n=6)。该方法快速、灵敏度高、重现性好，适用于生活饮用水中17种挥发性卤代烃的同时测定。     

顶空-气相色谱法测定海水中8种苯系物

提出了顶空-气相色谱法测定海水中残留的8种苯系物的方法。分别选择40℃及30min作为样品在顶空瓶中的平衡温度和平衡时间。选用Nukol毛细管色谱柱(30m×0.25mm,0.25μm)分离,氢火焰离子化检测器测定。8种苯系物在13min内能完全分离。8种苯系物的质量浓度在10.0～200μg.L-1范围内与其峰面积呈线性关系,检出限(3S/N)均为2μg.L-1。以海水样品为基体,在3个浓度水平上进行加标回收试验,回收率在93%～119%之间,相对标准偏差(n=6)在1.1%～5.3%之间。     

顶空进样GC-SIM-MS测定硝唑尼特中溶剂残留甲醇含量

利用气相色谱-选择离子监测质谱联用仪(GC-SIM-MS)测定硝唑尼特样品中溶剂残留甲醇的含量,顶空进样,温度为70℃,时间为20 min.SIM定量离子m/z 32,参考离子m/z 31,30和29.甲醇质量浓度在0.5~100μg/m L内呈良好的线性(R~2=0.999 92).方法相对标准偏差为2.49%~4.85%,样品加标回收在94.5%~102.8%之间,检测限为0.5μg/m L,符合定量分析的要求.     

顶空-气相色谱法测定纸类产品中游离甲醛

采用顶空-气相色谱法测定纸类产品中游离甲醛的含量。选择顶空平衡温度和时间分别为100℃和30min,用HP-INNOWAX色谱柱(60m×0.32mm,0.50μm)分离,氢火焰离子化检测器检测。甲醛的质量分数在1~100μg·g-1范围内与其峰面积呈线性关系,方法的检出限(3S/N)为0.4μg·g-1。以空白样品为基体进行加标回收试验,所得回收率在82.5%~94.4%之间,测定值的相对标准偏差(n=6)在2.1%~4.2%之间。     

顶空毛细管气相色谱法测定非那雄胺中有机溶剂的残留量

建立了顶空毛细管气相色谱法测定非那雄胺中二氯甲烷和氯仿两种有机溶剂残留量的方法,并讨论了平衡温度、平衡时间、盐效应对测定的影响。分析结果表明:该法可将两种残留有机溶剂完全分离,具有较好的线性(相关系数分别为0.999 7和0.999 8),检出限为3.2μg/L和0.094μg/L,测定结果的相对标准偏差分别为1.33%和0.89%,样品回收率分别为94%和96%。     

顶空-气相色谱法同时测定水中正丁醇、异丁醇、正丁醛和异丁醛北大核心CSCD

采用顶空-气相色谱法同时测定水中正丁醇、异丁醇、正丁醛和异丁醛的含量。顶空平衡温度为60℃,顶空加热平衡时间为30min。用HP-INNOWAX色谱柱(30.0m×0.53mm,1.0μm)分离,氢火焰离子化检测器检测。4种化合物的质量浓度在一定范围内与其对应的峰面积呈线性关系,方法的检出限为6.96~11.17μg·L^(-1)。以空白样品为基体进行加标回收试验,所得回收率为80.0%~116%,测定值的相对标准偏差(n=6)为3.2%~9.1%。     

顶空-气相色谱法测定土壤中甲醇的含量北大核心CSCD

采用顶空-气相色谱法测定土壤中甲醇的含量。顶空平衡温度为80℃,顶空平衡时间为15min。用DB-WAX石英毛细管色谱柱(30m×0.53mm,1.00μm)分离,氢火焰离子化检测器检测。甲醇的质量分数在0.791~197 mg·kg^(-1)内与其对应的峰面积呈线性关系,检出限(3.14s)为0.37mg·kg^(-1)。以空白样品为基体制得加标样品(39.5mg·kg^(-1)),测定值的相对标准偏差(n=7)为2.7%。在7.91,79.1,158mg·kg^(-1)等3个浓度水平进行加标回收试验,回收率为99.4%~103%。     

顶空-气相色谱法同时测定水中正丁醇、异丁醇、正丁醛和异丁醛

采用顶空-气相色谱法同时测定水中正丁醇、异丁醇、正丁醛和异丁醛的含量。顶空平衡温度为60℃,顶空加热平衡时间为30min。用HP-INNOWAX色谱柱(30.0m×0.53mm,1.0μm)分离,氢火焰离子化检测器检测。4种化合物的质量浓度在一定范围内与其对应的峰面积呈线性关系,方法的检出限为6.96~11.17μg·L~(-1)。以空白样品为基体进行加标回收试验,所得回收率为80.0%~116%,测定值的相对标准偏差(n=6)为3.2%~9.1%。     

顶空气相色谱-质谱法测定土壤和地下水中的甲基叔丁基醚

建立顶空–气相色谱–质谱法测定土壤和地下水中甲基叔丁基醚的检测方法。对顶空萃取进样器的工作条件进行优化,确定了最佳的顶空萃取条件:顶空平衡温度为85℃,顶空瓶恒温时间为30 min,平衡时间为1 min,传输线温度为110℃,进样针温度为90℃,进样时间为0.2 min,拔针时间为0.4 min。甲基叔丁基醚的质量浓度在10～200μg/L范围内与响应值呈良好的线性关系,线性相关系数r~2≥0.990。土壤和地下水中甲基叔丁基醚的检出限分别为1.2μg/kg,1.0μg/L,加标回收率分别为80.0%～94.8%,86.0%～100.5%,测定结果的相对标准偏差分别为2.35%～13.2%,2.84%～9.53%(n=6)。该方法具有良好的精密度与准确度,适用于土壤和地下水中甲基叔丁基醚的分析检测。     

顶空-气相色谱法测定葡萄糖氯化钠注射液中12种溶剂残留量

建立顶空-气相色谱法测定葡萄糖氯化钠注射液中12种残留溶剂含量的方法。采用HP-INNOWAX毛细管色谱柱(60 m×320μm,0.5μm)为分离柱,检测器为氢火焰离子化检测器(FID),柱温为程序升温。12种残留溶剂乙醇、异丙醇、丙酮、丁酮、乙酸乙酯、乙酸丁酯、乙酸正丙酯、甲苯、乙苯、对二甲苯、邻二甲苯、间二甲苯均能完全分离,在考察的浓度范围内线性关系良好(r>0.995),检出限分别为0.055,0.019,0.023,0.070,0.155,0.013,0.003,0.009,0.004,0.004,0.004,0.005μg/mL。平均回收率为90.6%~109.0%,测定结果的相对标准偏差为2.2%~5.6%(n=9)。该方法专属性强,精密度、准确度和检测灵敏度高,重复性好,可用于葡萄糖氯化钠注射液中12种溶剂残留量的测定。     

气相色谱法测定水中溴氰菊酯

采用气相色谱法-电子捕获检测器(GC- ECD)对水中溴氰菊酯进行检测.取10 mL水样,加入0.4g氯化钠,经环己烷萃取后,有机相干燥、氮吹浓缩,用带电子捕获检测器的气相色谱仪检测,外标法定量.结果表明,溴氰菊酯在2.0 ～40.0 μg/L范围内线性关系良好,相关系数为0.999 8.方法检出限为:0.40 μg/...     

Multivariate optimization of a capillary zone electrophoresis assay method for simultaneous quantification of metformin and vildagliptin from a formulation

A rapid, accurate, precise, and optimized capillary zone electrophoresis assay was established and validated for the simultaneous quantification of metformin and vildagliptin in tablets. The electrophoretic separation was achieved on an untreated bonded silica capillary with a background electrolyte comprising 25 mM of borate buffer at pH 7.5 at 207 nm. The concentration of the buffer and the pH of BGE were optimized using the multivariate optimization method for determining the retention time and peak area. Furthermore, the sample injection time, capillary oven temperature, and applied voltage were optimized. The capillary zone electrophoresis technique was validated for all required parameters as per the International Conference on Harmonization recommendations. The linearity ranged in the concentrations of 5–500 µg/mL and 5–100 µg/mL with the limit of detections of 0.22 µg/mL and 0.40 µg/mL for metformin and vildagliptin, respectively. In addition, the percent relative standard error for repeatability and inter-day precision was within the acceptable range. The mean recoveries determined by the capillary zone electrophoresis method were 99.2% and 100.4% for metformin and vildagliptin, respectively. Finally, the capillary zone electrophoresis process was effectively used for the assays of metformin and vildagliptin in their solid dosage form, and statistical outcomes were in agreement with the outcomes of the previously validated RP-HPLC method.     

用大口径毛细管气相色谱法快速测定塑料食品包装袋中有机残留物

采用５３０μｍ大口径毛细管色谱柱,顶空气相色谱－火焰电离检测器测定,建立了一种塑料食品包装袋中有机溶剂———甲苯、乙酸乙酯、丁酮和异丙醇残留的气相色谱快速分析方法,回收率为９４．８％～１０１．６％,相对标准偏差为０．８％～２．７％。方法简便、灵敏、准确、重现性好。     

气相色谱法同时测定溶剂型胶黏剂中的9种有害物质

建立了利用毛细管柱气相色谱同时测定溶剂型胶黏剂中苯、 甲苯、 对（间）二甲苯、 邻二甲苯、 二氯甲烷、1,2-二氯乙烷、1,1,2-三氯乙烷、三氯乙烯、甲苯二异氰酸酯（TDI）的方法,并对样品中有害物质的分离提取和色谱条件进行了研究.实验结果表明,方法化合物浓度在10~300 μg/mL时,线性相关系数不低于0.999 1,样品加标回收率在91.2%~104.1%之间,相对标准偏差均小于5%,检出限为0.1~3.0 μg/mL.方法不仅回收率高、重现性好,而且简便、快速.     

Rapid determination of cyclamate in foods by solid-phase extraction and capillary electrophoresis

A method for the determination of cyclamate in food was developed using solid-phase extraction (SPE) and capillary electrophoresis (CE) with indirect ultraviolet (UV) detection. A 5-10 g sample in 0.1 mol/L hydrochloric acid was homogenized and made up to a volume of 50 mL with 0.1 mol/L hydrochloric acid. After the sample was centrifuged, 25 mL of supernatant was loaded into an Oasis HLB SPE cartridge. The cartridge was washed with 2 mL of demineralized water followed by 2 mL of 50% aqueous methanol, and cyclamate was eluted with 4.5 mL of 50% aqueous methanol. The eluate was added to a solution of sodium propionate (internal standard) for CE analysis. The cyclamate in the eluate was electrophoresed on a fused-silica capillary using 1 mmol/L hexadecyltrimethylammonium bromide and 10 mmol/L potassium sorbate as a running buffer. Detection and reference wavelengths of cyclamate determined with a UV detector were 300 and 254 nm, respectively. The calibration curves for cyclamate showed good linearity in the range of 2-1000 microg/mL and the limits of detection in beverage, fruit in syrup, jam, pickles and confectionary are sample dependent and ranged from 5-10 microg/g. The recovery of cyclamate added at a level of 200 microg/g to various kinds of foods was 93.3-108.3% and the relative standard deviation was less than 4.9% (n=3). A number of commercial samples were analyzed using the proposed method. Cyclamate was detected in one waume, two pickles, and two sunflower seeds. The quantitative values determined with CE correlated to those from high-performance liquid chromatography (HPLC) (the detected values of cyclamate in a sunflower seed measured by CE and HPLC were 3.40 g/kg and 3.51 g/kg, respectively). This analytical method for cyclamate using CE is especially suitable for use in the field.     

毛细管气相色谱法同时测定工作场所空气中丁酮、三氯乙烯、四氯乙烯、正丁醇、乙苯

主要针对研究用气相色谱法同时测定工作场所空气中丁酮、三氯乙烯、四氯乙烯、正丁醇、乙苯质量浓度。该法线性范围0.2~1 630μg/mL,最低检出质量浓度为0.1~0.7 mg/m~3,加标回收率96.43%~98.56%,相对标准偏差小于5%。该法灵敏度高、精密度与准确度好、并且操作简便、分离效果好,在满足实验条件的前提下能大大缩短采样时间和分析时间。     

固相萃取–毛细管气相色谱法同时测定水体中8种有机磷类农药残留

建立固相萃取–毛细管气相色谱法同时测定水体中敌敌畏、乙酰甲胺磷、治螟磷、乐果、甲基对硫磷、马拉硫磷、杀螟硫磷和水胺硫磷8种有机磷类农药残留。样品经OASIS HLB固相萃取柱富集,丙酮洗脱,用毛细管气相色谱(FPD)法进行定量分析。8种有机磷类农残留的质量浓度在0.05~4.0μg/m L范围内与色谱峰面积线性关系良好,相关系数均大于0.998,方法检出限为0.004~0.01μg/m L。测定结果的相对偏差为2.6%~4.5%(n=6),加标回收率为81.6%~106.2%。该方法操作简单、灵敏度高,可用于检测水体中的8种有机磷类农药残留。     

Design and evaluation of capillary electrophoresis in dynamically coated capillaries coupled with chemiluminescence detection

A dynamic coating capillary electrophoresis coupled with a simplified on-line chemiluminescence detection system was designed and evaluated. In the proposed system, poly-vinylpyrrolidone was used as dynamic coating substance in the separation buffer to reduce the unwanted protein non-specific adsorption, which was first applied in capillary electrophoresis coupling with on-line chemiluminescence detection. In order to avoid complex processing, an ordinary plastic cuvette was modified as a three-way joint. The chemiluminescence reaction conditions and capillary electrophoresis separation conditions were investigated in detail. The results showed that the coated capillary can be injected protein samples at least 30 times continuously with good repeatability. Under optimal conditions, the chemiluminescence relative intensity was linear with the concentration of hemoglobin in the range of 4-1850 μg mL(-1) and the detection limit was 2.0 μg mL(-1) (S/N=3). The relative standard deviation of migration times and peak heights for 40 μg mL(-1) hemoglobin were 2.5% and 4.1% (n=11) respectively. Interference of matrix effects was overcome by the calibration according to standard addition methods. Afterwards, the method was validated successfully and was applied to detect the concentration of hemoglobin in the serum of haemolytic patients.     

衍生化气相色谱法测定早强剂中三乙醇胺含量

建立了衍生化气相色谱法定量分析水泥早强剂中三乙醇胺含量的方法。以丙三醇作为内标,采用HP-5毛细管柱分离样品,氢火焰离子化检测器(FID)测定三乙醇胺含量。三乙醇胺在0.2～5.0mg/mL范围内与三乙醇胺/内标的乙酰化物色谱峰面积的比值呈线性关系,相关系数r=0.9996。方法检出限为42.6μg/mL,平均回收率为96.6%,相对标准偏差(RSD)为0.759%。该方法具有操作简便、快速、准确等优点,可用于测定水泥早强剂中三乙醇胺的含量。