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本文以分散液液微萃取作为样品的前处理技术,建立了气相色谱-氢火焰离子化检测器分析海水中邻苯二甲酸酯的新方法。优化了分散液液微萃取的萃取条件,6种邻苯二甲酸酯线性范围在1.0-50.0μg/mL之间,R≥0.9953,回收率在92.5%~106.4%之间,最低检测限为0.15μg/mL。将方法应用于海水中邻苯二甲酸酯类的检测,易于操作,分析结果可靠。 相似文献
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固相萃取-气相色谱质谱法测定食用油中邻苯二甲酸酯 总被引:2,自引:0,他引:2
建立了固相萃取-气相色谱质谱法测定食用油中邻苯二甲酸酯的分析方法。以正己烷为提取剂萃取试样中的邻苯二甲酸酯,样液经中性氧化铝自组装固相萃取柱净化后进行GC/MS测定分析。采用选择离子扫描方式,用外标法进行定量分析。方法的检出限(S/N=3)为1~6μg/kg。在加标水平为50μg/kg时,平均回收率为67.3~107%,相对标准偏差(RSD)为3.6~6.1%;在加标水平为100μg/kg时,平均回收率为67.5~103%,相对标准偏差(RSD)为3.2~6.2%。本方法简便、快速地实现了食用油中邻苯二甲酸酯的检测。 相似文献
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建立了小体积液液萃取气相色谱法快速测定生活饮用水中三氯乙醛的分析方法。方法采用样品管作为萃取容器,甲基叔丁基醚作为萃取溶剂,超声波萃取,经过DM-5毛细管柱(30 m×0.25 mm×0.25μm)分离后,电子捕获检测器(ECD)检测。三氯乙醛的质量浓度在0.001~0.05 mg·L-1范围内与色谱峰面积具有良好的线性关系,相关系数为0.9993,方法检出限为0.02μg·L-1。空白样品加标回收率为85.0%~98.2%,测定结果相对标准偏差为1.8%~5.8%。该方法灵敏度高,精密度好,快速、准确、高效,适用于生活饮用水中三氯乙醛的快速测定。 相似文献
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气相色谱-质谱法检测牛奶中左旋咪唑残留的研究 总被引:1,自引:0,他引:1
目的:建立牛奶中左旋咪唑残留量检测的气相色谱-质谱方法。方法:牛奶样品经乙酸乙酯提取,盐酸反萃取后碱化,三氯甲烷提取液,可供气相色谱质谱联用仪分析。采用Agilent 6890N-5973i气-质谱联用仪,HP-5MS(30m×0.25 mm×0.25μm)毛细管柱,EI离子源,m/z 204、203、148、101选择离子监测,外标法定量。结果:左旋咪唑添加水平为5μg/L、10μg/L、50μg/L时,方法的回收率为76.5%~95.5%,批内批间相对标准偏差为1.4%~12.2%;在浓度为0.05~5μg/m L范围内左旋咪唑色谱峰面积与其质量浓度的线性方程为Y=16130X-164.37,r=0.9997。方法检测限为3μg/kg,定量限可达到10μg/kg。结论:所建立的GC-MS简便、快速,能够满足左旋咪唑残留检测的要求,可作为我国牛奶质量综合监控的有效方法之一,对我国动物性食品中左旋咪唑残留监控具有实际意义。 相似文献
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气相-动态顶空进样-气相色谱/质谱法间接测定饮用水源水中苦味酸 总被引:1,自引:0,他引:1
建立气相-动态顶空进样-气相色谱/质谱法(D-HS-GC/MS)间接测定饮用水源水中苦味酸(即2,4,6-三硝基苯酚)的方法。基于苦味酸与次氯酸钠反应生成挥发性有机物———氯化苦(硝基三氯甲烷),气相-动态顶空进样技术可对水样液上气相空间的氯化苦进行吹脱捕集,通过气相色谱/质谱法测定氯化苦含量来间接测定苦味酸的浓度。结果表明:苦味酸浓度在1.0020.0μg/L范围内呈良好的线性关系(r=0.9993),方法检出限为0.40μg/L;1.00,2.50,10.0μg/L标准点测得结果的相对标准偏差(RSD)分别为12.5%、9.2%和10.5%(n=7)。对实际水样进行分析,加标回收率为102%20.0μg/L范围内呈良好的线性关系(r=0.9993),方法检出限为0.40μg/L;1.00,2.50,10.0μg/L标准点测得结果的相对标准偏差(RSD)分别为12.5%、9.2%和10.5%(n=7)。对实际水样进行分析,加标回收率为102%131%,RSD为3.5%131%,RSD为3.5%16.6%(n=3)。 相似文献
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建立全自动固相萃取-凝胶净化-GC-MS/MS对耕地水渠中的5种农药残留(螺螨酯、肟菌酯、吡唑醚菌酯、2,4-滴丁酯和七氟菊酯)的检测方法。采用全自动固相萃取技术,选择ENVI-Carb固相萃取柱对耕地水样品进行农药提取。提取液经凝胶净化色谱净化后在氮吹仪中吹至近干。加入1 mL乙酸乙酯溶解残渣,0.22μm微孔滤膜过滤后进样气相色谱质谱联用仪(GC-MS/MS)以多反应监测模式(MRM)扫描,外标法定量。结果表明螺螨酯、肟菌酯、吡唑醚菌酯、2,4-滴丁酯和七氟菊酯在质量浓度0.01~2.0μg/mL范围内线性关系良好,线性相关系数均大于0.995,检出限如下:螺螨酯:4.23μg/L、肟菌酯:3.52μg/L、吡唑醚菌酯:3.69μg/L、2,4-滴丁酯:2.26μg/L、七氟菊酯:1.25μg/mL。样品在低、中、高三水平浓度点的回收率在90.9%~101.3%之间,精密度测定结果的相对标准偏差在1.68%~4.03%(n=6)。该方法净化效果好,定性定量结果准确,适用于水样中农药残留的监测。 相似文献
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采用液相色谱-串联质谱法检测了贻贝中大田软海绵酸(OA)和鳍藻毒素-1(DTX-1)两种腹泻性贝类毒素的含量。样品经80%甲醇水溶液提取,Sep-pak silica固相萃取小柱净化,80%甲醇水溶液定容后供HPLC-MS/MS分析。采用电喷雾负离子模式多反应监测方式进行检测,OA和DTX-1的定量检测的离子对分别为m/z 803.5/255.1和m/z817.4/255.1。2种贝类毒素在20~800μg/L范围内线性良好;在4个添加水平下OA的回收率为79.5%~88.6%,RSD为8.43%~10.4%;DTX-1的回收率为83.8%~91.2%,RSD为4.22%~6.54%。方法灵敏度高,定量限为0.02mg/kg。来自市场和产地的45个贻贝样品残留分析发现,有4个样品检出腹泻性贝类毒素,检出率为8.9%。 相似文献
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Urinary 2-thioxothiazolidine-4-carboxylic acid is a useful indicator to assess the degree of occupational exposure to carbon disulfide. A new procedure is described for the isolation of this compound from urine prior to reversed-phase high-performance liquid chromatography. It is based on liquid-liquid extraction with methyl tert-butyl ether, followed by affinity chromatography on organomercurial agarose gel. 5-Carboxythiouracil is used as internal standard. The superior selectivity of affinity chromatography for the isolation of 2-thioxothiazolidine-4-carboxylic acid from urine permits an isocratic high-performance liquid chromatographic analysis. The total recovery of 2.5 mg of 2-thioxothiazolidine-4-carboxylic acid/g of creatinine in spiked urine by liquid-liquid extraction combined with affinity chromatography was 48.0% (SD 2.0%, n = 8). Within-run and within-day relative standard deviations averaged 4.0% (means = 2.48 mg/g of urinary creatinine, n = 9) and 6.5% (means = 1.19 mg/g of urinary creatinine, n = 15), respectively. The detection limit of the method was estimated at 0.05 mg of 2-thioxothiazolidine-4-carboxylic acid/g of urinary creatinine. The identity and spectral purity of 2-thioxothiazolidine-4-carboxylic acid detected in the urine extracts were confirmed by diode-array UV-vis detection. Typical 2-thioxothiazolidine-4-carboxylic acid levels in individual workers exposed to carbon disulfide ranged from nondetectable to 11 mg/g of urinary creatinine, several of which exceeded the generally accepted biological exposure index of 5 mg/g of urinary creatinine. 相似文献
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建立可快速准确测定玫瑰孢链霉菌发酵液中达托霉素含量的RRLC方法。采用高分离度快速液相色谱(RRLC)Agilent 1200 series,色谱柱:Aglient XDB C18,1.8u,4.6*50mm。流动相:0.1%三氟乙酸水溶液:乙腈=64:36,检测波长为214 nm,柱温为30℃。结果:达托霉素浓度范围在25~500ug/ml线性良好,相关系数为0.9989;测得发酵液样品的平均回收率为101.7%,RSD为0.63%。结论:方法准确可靠,可以用于达托霉素发酵过程的含量测定。 相似文献
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本文研究了药丸中西地那非的高效液相色谱法鉴定。色谱柱为XDB-C18,5μm,4.6×150mm,二极管阵列检测器检测230nm(带宽4nm),流动相为35%乙睛+65%0.025mmol/L KH2PO4(含0.1‰v/v乙二胺)(pH5.57),流速1mL/min。样品用水溶解,外标法定量。检出限(LOD,S/N=3)为3μg/mL,定量限(LOQ,S/N=5)为4μg/mL。1000μg/mL、600μg/mL和200μg/mL的回收率分别为98.8%、101.3%和99.9%。6次测定600μg/mL和200μg/mL的相对标准偏差(RSD%)分别为2.4%和2.6%。在20~1000μg/mL范围内线型回归方程为Y=16.692X+50.17(Y为相应信号,mAU;X为浓度,μg/mL),回归系数R2为0.9998。该方法样品处理简单,定量准确度高,干扰小,可用于药丸中西地那非的法庭科学鉴定。 相似文献
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水中汞的电感耦合等离子体-质谱法测定 总被引:1,自引:0,他引:1
为解决水中汞不稳定以及易吸附而引起记忆效应的问题,建立分析水中汞的电感耦合等离子体质谱新方法,汞标准溶液中加金形成金汞齐,采用200μg/LAu2+-5%HNO3溶液作为清洗液,选取Rh103作为内标元素。结果标明:在79d内,汞溶液的标准曲线稳定,其相关系数在0.9993~0.9998之间,仪器检出限在1.15×10-3~3.11×10-2μg/L范围内。该方法分析水中痕量汞具有检出限低、数据准确性高、再现性好的特点,所用试剂种类少且毒性小。 相似文献
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本文采用湿法消解氢化物-原子吸收光谱法,测定不同产地土牛膝中砷、汞的含量。结果显示标样中砷、汞的浓度与吸光度呈良好的线性关系,校准曲线的线性回归方程分别为:A=0.1753C+0.72380、A=0.0637C+0.0093,相关系数R=0.9999、R=0.9993,检出限为0.0585μg·L-1、0.0094μg·L-1,相对标准偏差(n=10)为1.0%~5.0%、1.0%~5.0%,加标回收率为97%~102%、98%~101%。样品中砷、汞含量的实验结果为:北京产土牛膝:1040.1415、364.4999μg·L-1,成都产土牛膝:222.0217、211.4003μg·L-1,郴州产土牛膝:1068.0549、244.4386μg·L-1,长沙产土牛膝:1256.5094、289.0937μg·L-1。结论是本法简单易行,方便快捷,灵敏度和精密度高,选择性好,结果令人满意。 相似文献
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油炸小食品中乙二胺四乙酸二钠的高效液相色谱法测定 总被引:1,自引:0,他引:1
目的文中建立一种测定油炸食品中乙二胺四乙酸二钠的液相色谱检测方法。方法油炸小食品经无水乙醚除油并挥去乙醚,水萃取,加入氯化铜溶液及抗坏血酸溶液形成Cu-EDTA络合物。色谱分离时使用C18分析柱,甲醇、四正丁基溴化铵缓冲液为流动相,梯度洗脱,245nm波长检测。结果该方法线性范围20.00μg·ml^-1~400.00μg·ml^-1,相关系数r:0.9999,检出限6.5mg·kg^-1,定量限21mg·kg^-1。回收率:93.7~100.7%;精密度:RSD60.2%。结论该方法的准确性和精密度满足检测要求需要。 相似文献
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An array of eight porous monolithic columns, prepared in a Zeonor polymeric chip by UV-initiated polymerization of butyl methacrylate and ethylene dimethacrylate, was tested for solid-phase extraction (SPE) cleanup of biological samples prior to directly coupled electrospray mass spectrometry (ESI-MS). The chip, fabricated by hot embossing and thermal bonding, consists of eight parallel channels (10 mm long, 360 microm i.d.) connected via external fused-silica capillaries. The monomer mixture was aspirated simultaneously into the eight channels using a homemade vacuum manifold device and polymerized in parallel for 20 min under UV irradiation. The porous monolithic columns were then characterized by scanning electron microscopy and evaluated by ESI-MS applications with respect to sample capacity, recovery, reproducibility of peak area or peak height ratios, and linearity between peak height ratio and concentration using imipramine as a pharmaceutical test compound. The average sample capacity was estimated to be 0.30 microg with a relative standard deviation (RSD) of 26.5% for the eight monolithic columns on the same polymeric chip. For two chips prepared using the same monomer mixture, the difference in average sample capacity was 7.0%. The average recovery for the eight monolithic SPE columns on the same chip was 79.1% with an RSD of 7.9%. Using imipramine-d3 as an internal standard, the RSD of peak height ratios for the eight different columns was 2.0% for a standard solution containing 1 microg/mL imipramine. A linear calibration curve (R2 = 0.9995) was obtained for standard aqueous solutions of imipramine in the range from 0.025 to 10 microg/mL. To demonstrate the analytical potential of the chip-based SPE system, two different types of real-world samples including human urine sample and P450 drug metabolism incubation mixture were tested. Similar to standard aqueous solution, a linear correlation (R2 = 0.9995) was also found for human urine sample spiked with imipramine in the range of 0.025-10 microg/ mL. When aliquots of a human urine sample spiked with 1 microg/mL imipramine were loaded onto eight different monolithic columns, the RSD of peak height ratios was 3.8%. For a P450-imipramine incubation mixture, the formation of the N-demethylated metabolite (m/z 267.2) and the monohydroxylated metabolite (m/z 297.2) of imipramine was observed following chip-based monolithic SPE sample cleanup and preconcentration. 相似文献