气相色谱—原子发射光谱法测定水中微量路易氏剂的水解产物

本文用气相色谱－微波诱导等离子体原子发射光谱检测器（ＧＣ－ＭＩＰ－ＡＥＤ）对水中微量路易氏剂的水解产物的测定方法进行了研究，在酸性条件下，路易氏剂的水解产物与２，３－二巯基丙醇（ＢＡＬ）迅速反应形成挥发性的衍生物，在４８０．１９２，１８１．３７９和１８９．０４２ｎｍ波长下分别检测了衍生物的氯，硫，砷元素的发射信号，最小检测量为０．１μｇ／Ｌ。回收率为８７．２％～９７．４％。     

气相色谱-原子发射光谱法测定水中微量路易氏剂的水解产物

本文用气相色谱-微波诱导等离子体原子发射光谱检测器（GC－MIP－AED）对水中微量路易氏剂的水解产物的测定方法进行了研究。在酸性条件下，路易氏剂的水解产物与2，3－二巯基丙醇（BAL）迅速反应形成挥发性的衍生物。在480．192、181．379和189．042nm波长下分别检测了衍生物的氯、硫、砷元素的发射信号。最小检测量为0．1μg／L。回收率为87．2％～97．4％。     

气相色谱-微波诱导等离子体原子发射光谱法测定土壤中的微量路易氏剂

用气相色谱－微波诱导等离子体原子发射光谱（ＧＣＭＩＰＡＥＤ）对土壤中的路易氏剂的测定方法进行了研究。用稀盐酸萃取土壤中的路易氏剂或它的降解产物２－氯乙烯亚胂酸，再与１，３－二巯基丙烷反应生成挥发性环状化合物。用甲苯萃取衍生物，在４８０１９２、１８１３９７、１８９０４２ｎｍ波长处分析检测了衍生物中的氯、硫、砷等元素的发射信号。检测限为１０ｐｇ。路易氏剂的加标回收率在７１２０％～８７８８％之间。     

衍生化气相色谱—质谱法测定水中的路易氏剂及砷酸

本文研究了用气相色谱－质谱法测定水中微量路易氏剂及砷。在酸性条件下，路易氏剂及水解产物２，３－二巯基丙醇迅速反应形成挥发性的衍生物，大大提高了测定灵敏度。用选择性离子检测定量，最小检测量为每升水中１μｇ，路易氏剂的加标回收率为９５．６２％～１０５．８８％之间，砷的加标回收率为９６．３５％～１０６．０３％之间。     

气相色谱-原子发射光谱的CIC定量方法研究

运用气相色谱-原子发射光谱所独有的化合物无关校正曲线法(CIC法),分别对P、C、As、S 4个元素通道进行实验,得出了误差规律,结果表明:当被测化合物的保留时间与标准物质相近,分子结构相似,定量结果的相对误差较小;保留时间相差较远,分子结构相差较多,则定量结果的相对误差就较舷大.如果在实验室标准物质缺乏的情况下,可以利用CIC方法进行定量.     

衍生化-热解吸-气相色谱法测定空气中痕量路易氏剂

通过SKC采样泵以330 mL·min-1的速率抽吸一定时间,采集空气样品于不锈钢采样管中.样品中痕量路易氏剂(化学名为2-氯乙烯二氯胂)吸附并富集于吸附剂上.路易氏剂与3,4-二巯基甲苯的衍生化及其从吸附剂上的热解吸过程均在采样管中按选定的条件进行.应用Plack-ett-Burman设计,中心复合设计及响应曲面等方法对热解吸参数进行了优化.分别配制含有116.2 mg·L-1及1.162 g·L-1路易氏剂的空气模拟样品,按所提出的方法进行分析,测得路易氏剂的回收率依次为77.1%及99.4%.     

气相色谱-质谱联用法测定纺织品中1,2-二氯乙烷

建立了气相色谱-质谱联用(GC-MS)测定纺织品中1,2-二氯乙烷的方法。样品经甲醇超声提取后,以TG-624(30 m×0.32 mm×1.8μm)为色谱柱,采用气相色谱-质谱联用全扫描和选择离子扫描进行定性定量分析、外标法定量。结果表明:在0.05~30 mg/L范围内,1,2-二氯乙烷的线性关系良好,相关系数为0.999 3;方法检出限为0.50 mg/kg。在0.5、1.0、5.0 mg/kg 3个加标水平下,粘纤、聚酯、羊毛、锦纶、桑蚕丝、腈纶、棉7种纺织品基底的加标回收率为85.2%~101.4%,相对标准偏差(RSD)为4.0%~7.4%。该方法简便、准确,灵敏度和精密度高,适用于纺织品中1,2-二氯乙烷的分析检测。     

气相色谱-微波诱导等离子体原子发射光谱的应用进展

气相色谱-微波诱导等离子体原子发射光谱(GC-MW-AES)是一种具有显特点的分离一检测方法,可进行多元素检测并具有较高的元素选择性。本综述了GC-MIP-AES的原理、特点及其近年在非金属和金属有机化合物检测方面的应用,评述了GC-MIP-AES中元素响应因子的化合物无关性校正用于经验公式计算和非同一标准品定量分析的进展。引用献56篇。     

催化裂化汽油中硫化物的气相色谱-原子发射光谱分析方法及应用

采用气相色谱-原子发射光谱联用(GC-AED)技术，建立了催化裂化汽油中各种硫化物类型分布的分析方法。考察了色谱条件对催化汽油中各种硫化物分离的影响，定性了催化汽油中的60余种硫化物，首次计算了程序升温条件下汽油馏分中各种硫化物的保留指数，为不同实验室的定性比较提供了依据。该方法可应用于不同来源汽油中各种硫化物类型分布的研究。     

气相色谱-质谱联用法测定日用品及食品中9种凉味剂的含量

建立了日用品及食品中薄荷脑等9种新型凉味剂含量的测定方法.样品经乙醇超声提取后,用DB-1701 MS毛细管色谱柱(30 m×0.25 mm×0.25 μm)分离,选择离子监测模式(SIM)进行质谱检测.在优化分析条件下,9种凉味剂分离良好,其在0.25～250 μg/mL浓度范围内线性关系良好,相关系数均大于0.996,除薄荷氧基.1,2丙二醇(0.26 μg/g)外,其余凉味剂的检出限均小于0.1μg/g;在3个不同加标浓度下的平均回收率为82.8％～103.5％,相对标准偏差(RSD,n=6)均不高于3.7％.该方法灵敏、准确、可靠,能较好地分离薄荷脑等9种凉味剂,具有分析时间短、抗干扰性好、定量准确等优点,可为含薄荷(清凉)口味食品的质量控制及未知凉味剂含量样品的分析提供科学数据.     

气相色谱-原子发射光谱联用测定磷酸酯类化合物元素比例式和分子式

以GC-AED联用法测定了合成的磷酸酯类混合物中各化合物的C、H、O和P元素比例式。含10～21个C原子、4个O原子和23～45个H原子的各分子,C和O元素的测量误差分别为0．2．0．7和0．02～0．3个原子数,H元素因未进行线性化校正,误差最大,在0．1～3．0原子数。以瞬时光谱中波长177．5、178．1、178．5和185．9am的特征发射谱线确认了P元素的存在。综合该类同系物在非极性色谱柱上的出峰规律和理论产物的分子量,给出了推测分子式,经与标准品对照证明推测分子式是正确的。文中还讨论了影响未知化合物元素比例式测定的因素。     

Determination of Trace Butyltin Compounds in Sea Water by Gas Chromatography-Atomic Absorption Spectrometry

A gas chromatography-atomic absorption spectrometric (GC-AAS) method has been developed for the determination of trace butyltin compounds in sea water. Aqueous butyltin compounds were reduced to the volatile hydride forms by NaBH₄ and were extracted with dichloromethane simultaneously. The dichloromethane extract was concentrated under reduced pressure, followed by direct injection into the GC-AAS system for analysis. The butyltin species were separated with a 2-m glass column packed with 2% OV-101 on Chromosorb G HP (100-120 mesh). Following GC separation, each species was transferred into an electrothermally heated (800 °C) quartz furnace for atomization. The tin atoms produced from individual butyltin compound were detected at 224.6 nm by an atomic absorption spectrometer. With a sea water sample (1 L), the detection limits (3σ) for monobutyltin, dibutyltin and tributyltin were approximately 20, 20 and 70 ng Sn L^?1, respectively. The method has been applied to the analysis of trace butyltin compounds in the sea water of Keelung Harbor.     

气相色谱-原子吸收联用技术测定人体体液中烷基汞

建立了一种用于生物样品中分子形态分析的气相色谱与原子吸收联用系统。系统的转移线为聚四氟乙烯管,组分在色谱住内分离后,经转移线运送到原子吸收检测系统。实验证明:系统具有灵敏度高、选择性好的优点,例汞绝对检测限为10-2ng,并首次用于人体血液和尿液中烷基隶的两种形态即氯化甲基汞和二甲基汞的定性和定量分析。     

石油馏分油中多元素的气相色谱-原子发射光谱联用模拟蒸馏研究

报道了在气相色谱-原子发射光谱联用仪上进行石油馏分油中C、H、S、N、C1多元素模拟蒸馏的研究结果。考察和讨论了进样方式,各元素的最小检测量和线性响应范围,H元素的非线性响应,分流失真等影响准确模拟蒸馏的因素,结果表明S元素在104的范围内是轻微弯曲的非线性,校正后的H元素定量误差不超过理论值的1％。提出的解决分流失真造成模拟蒸馏数据偏离正常值的方法,可使标准样品的测定值与标准值一致,波长为181．379um和174．200um的S和N元素实际样品模拟蒸馏准确定量的浓度下限分别为0．002％和0．04％。     

Determination of [13C-15N] Labeled Methylxanthines by Gas Chromatography-Atomic Emission Detection (GC-AED) and Compound-Independent Calibration

ABSTRACT

Compound independent calibration (CIC) can be used to measure stable isotopically labeled molecules and their metabolites. This study was designed to demonstrate that gas chromatography coupled to atomic emission detection and CIC are useful analytical tools for the specific and quantitative determination of ¹³C and ¹⁵N labeled caffeine and its metabolites. These labeled compounds can be measured by monitoring either ¹³C or ¹⁵N atomic emission lines and using only one calibration function from one of the analytes. This method can be helpful when it is difficult or impossible to obtain an authentic reference material, which is often the case in metabolic studies.     

Simple Analysis of Amphetamines in Human Whole Blood and Urine by Headspace Capillary Gas Chromatography with Large Volume Injection

Summary A very simple method for the analysis of methamphetamine and amphetamine in human whole blood and urine by headspace gas chromatography (GC) has been presented. It neither needs solid-phase microextraction nor cryogenic trapping devices, but only a conventional capillary GC instrument with flame ionization detection (FID). The two special points to be mentioned in this method are the in-matrix derivatization of amphetamines for vaporization and the capability of injection of as large as 5 mL of the headspace vapor into a GC instrument in the splitless mode for sensitive detection. After heating a whole blood or urine sample containing amphetamines, -methylbenzylamine (internal standard, IS) and heptafluoro-n-butyryl chloride under alkaline conditions in a 7.0-mL vial at 90 °C for 20 min, 5 mL of the headspace vapor was drawn with a glass syringe and injected into the gas chromatograph. During injection the column was at 40 °C to trap the analytes, and then the oven temperature was programmed up to 320 °C. Sharp peaks were obtained for each analyte and IS, and only a relatively small number of background impurity peaks for the whole blood and urine samples. The detection limits for each amphetamine were estimated to be 0.1 g mL^–1 for whole blood and 0.03 g mL^–1 for urine. Precision and linearity were also tested to confirm the reliability. Methamphetamine and amphetamine could be determined from whole blood and urine obtained at autopsy in three methamphetamine poisoning cases. The identity of each peak appearing in the gas chromatograms was confirmed by GC/mass spectrometry.     

Elemental Analysis by Gas Chromatography-Atomic Emission Detection for the Control of a Deuterated Derivatization Reagent

Abstract

Methyl iodide is a derivatization reagent often used to methylate molecules with amine, hydroxyl or carboxylic groups before a gas chromatographic analysis. In order to improve the analytical qualities of quantitative determination by gas chromatography mass spectrometry, derivatization with reagents labelled with stable isotopes can be used. Deuteromethyliodide can be used instead of methyliodide to obtain labelled compounds easily detected, as far as the reagent is pure enough.

This paper illustrates the use of the gas chromatography atomic emission detection coupling (GC-AED) for the study of the purity of a reagent labelled with deuterium (IC²H3) used for the derivatization of a new immunoenhancer (sodium ditiocarb - lmuthiol^R) before the GC-MS determination of the parent drug and its methylated metabolite. The elements monitored simultaneously are: carbon (193.03 nm), hydrogen (656.3 nm), deuterium (656.04 nm), iodine (183.1 nm) and sulfur (180.7 nm). The chromatograms corresponding to these various elements obviously show the presence of compounds containing deuterium and I or hydrogen associated with iodine and make easier and faster the determination of the chemical pollution of the IC²H3 batch. The monitoring of the specific wavelength associated to the atomic emission of sulfur (180.7 nm) allows easy detection o f ditiocarb and its metabolite from the chromatogram made very complex by the reagent pollution.