尿中有机酸的毛细管气相色谱—质谱轮廓分析—用于苯丙酮尿症的诊断

应用毛细管气相色谱-质谱轮廓分析方法,测定了33例2.5～4.5岁健康儿童尿中有机酸种类及含量和8例拟诊为苯丙酮尿症儿童尿中的有机酸,结果表明患儿尿样中苯丙酮酸、苯乙酸、邻羟基苯乙酸、对羟基苯乙酸高于正常值10～470倍。为苯丙酮尿症的确诊提供了可靠方法。     

气相色谱/氢火焰检测器检测HL-60细胞DNA中氧化损伤产物8-羟基鸟嘌呤的研究

用0．4mmol／LH2O2处理HL－60细胞株24h,采用气相色谱／氢火焰检测器（GC／FID）检测DNA氧化损伤产物8-羟基鸟嘌呤,并用气相色谱质谱仪选择性离子检测（CGC／MS－SIM）对其进一步鉴定。所用方法的平均回收率为81．7％,RSD小于5％。     

凝胶色谱净化-气相色谱法测定酱油中7种防腐剂

建立了凝胶色谱净化-气相色谱法测定酱油中山梨酸、苯甲酸、脱氢乙酸、对羟基苯甲酸甲酯、对羟基苯甲酸乙酯、对羟基苯甲酸丙酯、对羟基苯甲酸丁酯共7种防腐剂的方法.样品经过乙醚提取,凝胶渗透色谱净化,毛细管柱(Rxi-17,30 m×0.25 mm×0.25μm)分离后,FID检测器检测.7种化合物在10.0～400.0 mg...     

高效液相色谱-串联质谱法测定兔尿中溴氰菊酯及其毒性生物标志物

建立了一种应用高效液相色谱-串联质谱（HPLC-MS/MS）测定兔尿中与溴氰菊酯毒性相关的多种生物标志物的检测方法。分析物包括溴氰菊酯及其代谢产物1R,3R-二溴菊酸、3-苯氧基苯甲酸,以及5种生物标志物5-羟色胺、5-羟基吲哚乙酸、3-硝基丙酸、8-羟基脱氧鸟苷和6-甲氧基鸟嘌呤。样品经硅藻土基质固相分散萃取、三氯乙酸沉淀蛋白质和HLB固相萃取小柱净化,使用电喷雾离子源,在多反应监测模式下正负切换采集测定,其中溴氰菊酯、5-羟色胺、5-羟基吲哚乙酸、8-羟基脱氧鸟苷和6-甲氧基鸟嘌呤采用正离子模式,1R,3R-二溴菊酸、3-苯氧基苯甲酸和3-硝基丙酸采用负离子模式。基质校准曲线外标法定量。结果表明,7种生物标志物在各自的浓度范围内线性关系良好（R²不小于0.9914）,5-羟基吲哚乙酸的检出限和定量限分别为20 μg/L和50 μg/L,其余化合物的检出限和定量限分别为0.2~5.0 μg/L和0.5~10 μg/L;在兔尿中3个不同添加水平的平均回收率为74.2%~98.7%,相对标准偏差（RSD）不大于12%,方法简单、快速、准确、灵敏,可作为溴氰菊酯暴露评估的检测方法。     

高效液相色谱-串联质谱法快速测定吸烟者尿液中8-羟基脱氧鸟苷和8-羟基鸟苷

在采集的尿液样品中依次加入内标和甲醇(控制样品介质中甲醇的体积分数约为50%),所得混合液经自主设计的样品离心分离和过滤装置处理,采用高效液相色谱-串联质谱法快速测定滤液中8-羟基脱氧鸟苷和8-羟基鸟苷的含量。以Synergi Polar-RP色谱柱为固定相,以不同体积比的10 g·L~(-1)乙酸铵溶液和甲醇的混合液为流动相进行梯度洗脱,串联质谱分析中采用电喷雾离子源正离子模式和多反应监测模式。以~(15)N_5-8-羟基脱氧鸟苷为内标。8-羟基脱氧鸟苷和8-羟基鸟苷的线性范围均为0.2～40μg·L~(-1),检出限(3S/N)依次为0.054,0.092μg·L~(-1),测定下限(10S/N)依次为0.18,0.32μg·L~(-1)。以中度吸烟者的尿液样品为基体进行加标回收试验,所得日内回收率、日间回收率分别为92.3%～96.3%,93.4%～96.3%,测定值的日内相对标准偏差(n=7)和日间相对标准偏差(n=7)分别为1.6%～3.0%,2.8%～3.4%。     

多维气相色谱法检测酒中甲醇

建立了多维气相色谱检测酒中甲醇含量的方法.采用自动进样器将酒类样品直接注入气相色谱进样口,依次经过非极性RTX-5ms色谱柱和极性HP-INNOWax色谱柱,由气相色谱质谱选择离子监测技术进行测定与确证.甲醇在1～10000 mg/L范围内呈线性相关;方法检出限为1 mg/L.各种酒类样品在5,50,250,400和8...     

气相色谱串联质谱法用于水产品中多氯联苯二代污染物鉴别

建立了气相色谱串联质谱法鉴别多氯联苯二代污染物羟基多氯联苯的方法,并用于水产品中羟基多氯联苯的分析。在60℃下,羟基多氯联苯经硅烷化衍生40 min,在气相色谱三重四级杆串联质谱仪全扫描模式(Full scan mode)下进行扫描,得到一级质谱全扫描图谱,确定3-羟基-多氯联苯101(3-OH-PCB101)、4-羟基-多氯联苯106(4-OH-PCB106)、4-羟基-多氯联苯112(4-OH-PCB112)等7种衍生化合物丰度最高的碎片离子,以此碎片离子为母离子,在二级质谱多反应监测模式( MRM)下进行扫描,得到二级质谱全扫描图谱,确定母离子产生的丰度最高的特征子离子,以此对应的离子对及其比例对化合物进行定性分析,分别得到7种羟基多氯联苯衍生物的一级、二级质谱图,通过串联质谱法对每种目标化合物进行定量分析,仪器检出限范围为0.02~0.14μg/L,定量检出限为0.09~0.48μg/L。将本方法用于水产品中羟基多氯联苯的鉴别,结果满意。     

气相色谱和气相色谱-质谱法测定食品中乙草胺残留

建立了气相色谱和气相色谱-质谱法检测10种植物源性和动物源性食品中乙草胺残留量检测方法.粮谷类和动物源性样品采用乙腈提取,GPC结合硅胶固相萃取柱净化;蔬菜类样品采用乙酸乙酯提取、硅胶固相萃取柱净化;元葱等样品先进行微波消解,然后采用乙酸乙酯提取,硅胶固相萃取柱净化.气相色谱和气相色谱-质谱联用法检测.两种方法检出限均为0.004 mg/kg; 在0.01～0.16 mg/L范围内均呈良好的线性关系,相关系数为0.9998和0.9997;在0.01、0.02和0.05 mg/kg的添加水平下,添加回收率在70%～102%之间;相对标准偏差(RSD)均小于10%.     

气相色谱-质谱法测定化妆品中8种乙二醇醚类物质

建立了化妆品中8种乙二醇醚类物质的气相色谱-质谱分析方法。样品经甲醇超声提取,提取液经0.45μm微孔滤膜过滤后,采用气相色谱-质谱法分析,外标法定量。在优化的色谱条件下,8种乙二醇醚类物质可实现基线分离,在各自线性范围内线性良好(r20.999)。在0.05、0.5、5 mg/kg 3个加标水平下,平均加标回收率为82.2%~113.0%,相对标准偏差(RSD,n=6)为0.60%~8.5%。方法的检出限为0.10~1.00 mg/kg,定量下限为0.25~2.00 mg/kg。该方法操作简便,准确可靠,重现性好,可用于化妆品中乙二醇醚类物质的测定。     

气相色谱—四温裂解气相色谱联用分析

本文利用气相色谱—四温裂解气相色谱联用仪对一些混合物作定性分析,此方法可用来作气相色谱难分离物质的鉴定。     

Comparison of three methods for natural gas dehydration

This paper compares three methods for natural gas dehydration that are widely applied in industry:(1) absorption by triethylene glycol, (2) adsorption on solid desiccants and (3) condensation. A comparison is made according to their energy demand and suitability for use. The energy calculations are performed on a model where 105 Nm3/h water saturated natural gas is processed at 30 °C. The pressure of the gas varies from 7 to 20 MPa. The required outlet concentration of water in natural gas is equivalent to the dew point temperature of -10 °C at gas pressure of 4 MPa.     

用天然气气相色谱分析仪快速分析天然气组分及性能参数

介绍用天然气气相色谱分析仪分析天然气中无机组分、有机组分和热值的方法,确定了分析方法和条件,该方法测量结果的相对标准偏差小于1%。采用该方法对制备的标准气体进行了考察,并将该方法用于天然气气体标准物质的性能评价和国际实验室间的比对,天然气组分含量比对相对误差在±1%之内,热量值比对相对误差在±3%之内,取得了国际等效性。     

气敏新材料MXenes在呼出气体传感器中的应用

电子鼻结合人工智能对呼出气进行检测、分析和识别已成为非侵入性医疗检测领域的研究热点.然而,目前已报道的气体传感材料尚不能同时满足高灵敏度、高选择性和稳定的室温检测,阻碍了气体传感器在医疗健康领域的应用及发展,寻找合适的传感材料具有重要的意义和挑战.新型二维层状纳米材料MXenes具有种类多、比表面积大、导电性能强、表面...     

用低温气相色谱分析火焰气体

本文采用低温气相色谱法分析了火焰气体的成份和深度，色谱柱固定相为ＰｏｒａｐａｒｋＱ，柱温范围－９９－２５０℃氦气作载气。在所选择的实验条件下，火焰气体中的Ｎ２和Ｏ２有效地得到分离，可迅速精确地分析确定Ｎ２的浓度以及其他成份和浓度。     

Prediction of water content of sour and acid gases

Estimating the feasibility of acid gas geological disposal requires the knowledge of the water content of the gas phase at moderate pressures and temperatures (typically below 50 MPa, below 380 K) and up to 6 mol NaCl. In this paper, a non-iterative model is developed to predict the water content of sour and acid gases at equilibrium with pure water and brine. This model is based on equating the chemical potential of water and using the modified Redlich–Kwong equation of state to calculate the fugacity of the gas phase. The water content of pure CH₄, CO₂ and H₂S are represented with average absolute deviations of less than 3.36, 7.04 and 8.4%, respectively. Experimental data of the water content of mixtures of the acid gases were reproduced with average absolute deviations of less than 6.32%.     

Polypyrrolones for membrane gas separations. I. Structural comparison of gas transport and sorption properties

Despite efforts by the membrane community to develop polymeric materials with improved O₂/N₂ separation performance, limited progress has occurred for almost a decade. Molecular sieving media, which can exhibit gas separation properties superior to polymers, tend to be brittle and uneconomical to produce for large‐scale membrane separation processes. Considering this, the polymer structures investigated in this work were designed to mimic aspects of the structure of molecular sieving media such as zeolites and carbon molecular sieves while maintaining the processability associated with polymers. Significantly attractive gas separation material properties were obtained using hyper rigid polypyrrolone copolymers with controlled packing disruptions between flat, packable segments. The gas transport properties in the materials changed dramatically as a result of different average interchain spacing. Moreover, all of the polypyrrolones studied in this work exhibited performance lying on or above the existing O₂/N₂ upper bound trade‐off line between permselectivity and permeability. These results, therefore, may point the way to a new cycle of membrane materials improvements for gas separations. © 1999 John Wiley & Sons, Inc. J Polym Sci B: Polym Phys 37: 1235–1249, 1999     

A novel correlation for estimation of hydrate forming condition of natural gases

An inherent problem with natural gas production or transmission is the formation of gas hydrates, which can lead to safety hazards to production/ transportation systems and to substantial economic risks. Therefore, an understanding of conditions where hydrates form is necessary to overcome hydrate related issues. Over the years, several models requiring more complicated and longer computations have been proposed for the prediction of hydrate formation conditions of natural gases. For these reasons, it is essential to develop a reliable and simple-to-use method for oil and gas practitioners. The purpose of this study is to formulate a novel empirical correlation for rapid estimation of hydrate formation condition of sweet natural gases. The developed correlation holds for wide range of temperatures (265–298 K), pressures (1200 to 40000 kPa) and molecular weights (16−29). New proposed correlation shows consistently accurate results across proposed pressure, temperature and molecular weight ranges. This consistency could not be matched by any of the widely accepted existing correlations within the investigated range. For all conditions, new correlation showed average absolute deviation to be less than 0.2% and provided much better results than the widely accepted existing correlations.     

有毒有害气体报警器检测探讨

介绍了常见有毒有害气体检测报警器的分类。对气体检测报警器的检测方法进行探讨,为此类报警器的检测方法提供建议。     

体液中-叶萩碱检测方法的研究

本文报道了用气相色谱(GC)及气相色谱-质谱联用(GC/MS)检出人体液中一叶萩碱的方法.尿样经碱化后用乙醚直接萃取,回收率为72.1％;血浆样品用Sep-pak小柱提取,回收率为 43.9％,GC/MS的检测限为 20ng.方法快速、简便、准确.     

非晶硅太阳能电池生产工艺用氣分析方法研究

本文对非晶硅太阳能电池制造工艺过程所用的无机氢化物烷类气体硅烷、硼烷、磷烷、甲烷和氢及其混合气的配制与分析方法进行了研究,以微机控制配气、检测程序、气相色谱法分成分析杂质,电容法测水分,方法已应用于工艺过程分析。