共查询到19条相似文献,搜索用时 46 毫秒
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《中国测试》2017,(2):50-54
采用正己烷为萃取剂,乙腈为乳化剂,建立超声辅助-乳化液液微萃取-气相色谱法(USA-ELLME-GC)检测水中甲苯、乙苯、对二甲苯、间二甲苯、邻二甲苯、1,3,5-三甲苯,1,2,4-三甲苯的分析方法。当萃取剂正己烷为150μL,乳化剂乙腈为400μL,超声时间为12 min时,50 m L水溶液中苯系物被成功萃取到正己烷中,富集倍数达到333倍。色谱条件为:DB-5MS(30 m×0.25 mm,0.25μm)毛细管柱,进样口温度220℃,检测器(FID)温度250℃,程序升温(初始45℃保持3 min,3°C/min升温至70℃,再以30℃/min升至200℃保持2 min),氢气流量10m L/min,尾吹气流量30 m L/min,分流比30∶1。在优化的萃取和色谱条件下,7种苯系物在0.08~1.00 mg/L浓度范围内与峰面积呈线性关系,相关系数均0.9980,方法检出限为0.005~0.01 mg/L,质量浓度均为0.10 mg/L的苯系物的7次前处理及测定结果相对标准偏差RSD为1.5%~4.7%。建立的方法应用于学校内湖水和实验室废水中7种苯系物的测定,平均回收率为86.5%~110.4%,测定结果满足分析化学痕量分析要求。 相似文献
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目的建立一种溶剂萃取/气相色谱-质谱联用法测定热熔胶中苯系物残留量的方法。方法优化溶剂萃取条件和仪器分析条件,热熔胶样品依次经超声萃取、冷冻离心后,萃取液通过气相色谱-质谱联用法测定并得到热熔胶中苯系物的残留量,并与顶空-气相色谱/质谱法测定结果进行比较。结果采用文中方法测定了6种苯系物的线性相关系数大于0.9992,定量限为0.03~0.07 mg/kg,回收率为89.1%~103.1%。文中方法与顶空进样法对实际样品的测定结果一致,并利用文中方法对70个市售热熔胶样品进行了测定,苯检出率为4.3%,残留量低于0.18 mg/kg,甲苯、乙苯、对-二甲苯、间-二甲苯、邻-二甲苯检出率大于92.9%,其残留量在0.10~58.68 mg/kg。结论文中方法具有简单、快速、准确度高等优点,适用于热熔胶中苯系物残留量的测定。 相似文献
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郑司伟 《中国新技术新产品》2011,(12):133-134
气相色谱法测定苯系物,具有精密度和准确度都较高,适用于检测水中苯系物的含量。研究表明采用升温程序比采用恒温几种物质分离效果更好,并且可得到满意的峰形。采用分流进样要比不分流进样效果好。 相似文献
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通过对喷漆作业气体样品中不同浓度苯系物的测定,建立热解吸气相色谱法,优化了气相色谱的操作条件,提出了保证测定质量的技术关键。适.用于污染源排放气体中苯系物的测定。 相似文献
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本文简述了苯系物对环境及人体健康的影响以及在测定环境中苯系物时的样品采集和处理方法。介绍了测定苯系物常用的色谱柱,列举了多种环境样品中苯系物色谱图。最后指出了深入开展苯系物监测方法研究的方向。 相似文献
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Xu X Keefer LK Waterhouse DJ Saavedra JE Veenstra TD Ziegler RG 《Analytical chemistry》2004,76(19):5829-5836
A rapid, sensitive, and specific high-performance liquid chromatography-electrospray ionization-multistage mass spectrometry (MS) method for measuring endogenous ketolic estrogen metabolites in human urine has been developed. The method requires a single hydrolysis/extraction/derivatization step and only 2.5 mL of urine, yet is able to simultaneously quantify estrone and its 2-methoxy and 2-, 4-, and 16alpha-hydroxy derivatives, 16-ketoestradiol, and 2-hydroxyestrone-3-methyl ether metabolites. The combination of a simple hydrazone derivatization step with multistage MS greatly enhances the sensitivity and specificity of the analysis of endogenous estrogen within human urine. Standard curves are linear over a 100-fold concentration range with linear regression correlation coefficients typically greater than 0.99. The lower limit of quantitation for each ketolic estrogen is 0.2 ng/2.5-mL urine sample (10 pg on column), with an accuracy of 93-103% and an overall precision, including the hydrolysis, extraction, and derivatization steps, of 1-13% relative standard derivation (RSD) for samples prepared concurrently and 8-16% RSD for samples prepared in separate batches. This method also allows for the identification of 2-hydroxyestrone-3-methyl ether in urine obtained from both pre- and postmenopausal women. This potentially protective estrogen metabolite has been previously reported only in the urine of pregnant women. Since individual patterns of estrogen metabolism may influence the risk of breast cancer, accurate and specific measurement of estrogen metabolites in biological matrixes will facilitate future research on breast cancer prevention, screening, and treatment. 相似文献
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本文根据美国INFICON公司HAPSITE便携式GC-MS的性能特点,结合国家环境空气的标准浓度限值要求,分析了采用便携式GC-MS检测空气中低浓度苯系物的准确度。 相似文献
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