气相色谱法测定空气和废气中8种烃类化合物

建立了针筒采样、大口径毛细管柱分离、气相色谱-氢火焰离子化检测器测定空气和废气中甲烷、乙烷、乙烯、乙炔、丙烷、异丁烷、正丁烷和正戊烷等8种烃类化合物的方法.优化了试验条件,方法线性良好,甲烷、乙烯、乙炔、乙烷、丙烷、异丁烷、正丁烷和正戊烷的检出限分别为0.09 mg/m3、0.20 mg/m3、0.18 mg/m3、0.29 mg/m3、0.28 mg/m3、0.37 mg/m3、0.16 mg/m3和0.56 mg/m3,RSD＜8.0%,加标回收率为80.5%～104%.     

气相色谱法直接测定水中微量有机胺

用配有氢火焰离子化检测器（FID）的气相色谱仪直接测定水中多种微量有机胺。试样经过滤后直接进样,在气相色谱仪上使用CP7448毛细管柱,用外标法测定水中微量甲胺、二甲胺、一乙胺、二乙胺的含量。在所选择的色谱操作条件下,甲胺、二甲胺、一乙胺、二乙胺的质量浓度分别在一定范围内与峰面积呈良好的线性关系。4种组分的回收率分别为96.7％,99．0％,101．2％,99．2％;精密度分别为4．3％,3．7％,5．5％,3．1％;检出限分别为2．0,2．0,1．5,1．5mg/L。该方法操作简便,回收率、精密度高。     

分子印迹技术在环境科学领域中的应用

分子印迹技术（MIT）是一门新兴的边缘科学技术,它的产生与发展为环境科学打开了又一视角。介绍了MIT的产生与发展及基本原理,综述了MIT在环境科学领域中的应用,主要包括MIT在固相萃取、膜分离、色谱分析、传感器及分子印迹聚合物作为催化剂在环境修复中的应用。     

甲磺酸帕珠沙星中甲烷磺酸的离子色谱法测定

建立了甲磺酸帕珠沙星中甲烷磺酸的离子色谱分析方法.选用亲水性的阴离子交换柱IonPac ASl8作分析柱,在线淋洗液发生器产生的KOH为淋洗液,等度淋洗,电导检测,在10min内完成甲烷磺酸分析.结果表明,在0.7-140mg·l-1范围内线性良好(r2=0.9998),样品峰面积的RSD为0.494%(n=7),回收率为107.2%.方法简便、快速、基体干扰小,可在甲磺酸帕珠沙星产品的检验中发挥重要作用.     

苦味酸测定中关键问题的研究

目前测定苦味酸的国标方法为《生活饮用水标准检验方法有机物指标》(GB/T 5750.8—2006)中的衍生物-液液萃取-气相色谱法,在实际测试过程中,发现水样pH值和基质效应会影响苦味酸测定。当pH值为8~12时,生成的氯化苦响应强度变化不大;在pH约为13时,响应强度最大。水质中除腐殖酸、硝基甲烷及2,4,6-三硝基甲苯会影响苦味酸测定外,硝基酚类和甲基酚类同样起到正干扰作用,因此,国标方法不能全面和准确地测定水中的苦味酸含量。     

基于BIM的装配式建筑并行施工作业空间冲突识别

为识别装配式建筑施工并行作业之间的空间冲突,分析装配式建筑施工项目现场各类作业空间占用需求,利用BIM技术模拟作业空间占用,引入混合轴向包围盒（AABB）与有向包围盒（OBB）算法,建立施工现场并行作业空间冲突检测模型。结果表明:所建立的模型可有效预测施工现场并行作业之间的空间冲突,为进一步的空间资源优化与项目安全管理提供支撑。     

基于BP神经网络的受限空间火灾联合探测方法

针对航空受限空间火灾探测高误报的问题,在现有技术成果基础上对多种火灾探测方式进行研讨,并提出1种基于BP神经网络技术的飞机机身内部受限空间火灾联合探测报警方法。该方法结合现有烟雾感应、气体传感器探测等常用火灾探测技术,以红外热成像探测为辅助手段,采用神经网络实现数据融合,对模拟实验舱火灾烟雾进行联合探测,在单一火灾探测方式基础上提高了探测准确率。     

An LC-MS/MS method for creatine and creatinine analysis in paraquat-intoxicated patients

Abstract

A sudden increase in serum creatinine after paraquat intoxication has been reported in several clinical studies. However, this dramatic change of creatinine may be possibly due to an interconversion of creatine-creatinine in relation to paraquat toxicity. In order to investigate the creatine-creatinine relationship, a liquid chromatography tandem mass spectrometry in combination with electrospray ionization was developed and validated for simultaneous determination of creatine and creatinine in the serum. The chromatographic separation was achieved on a Gemini® C₆-Phenyl column with a gradient elution consisting of 0.1% formic acid in ultrapure water and methanol as the mobile phase. The method yielded suitable levels of specificity and selectivity, and calibration curves of creatine and creatinine in serum were linear over the concentration range of 0.5–200?µg mL^?1. The limit of quantification of both compounds was 0.5?µg mL^?1, and the method was accurate within the recovery range of 96.23–102.75%, indicating the robustness of the method. The method was successfully applied to toxicological samples from paraquat-intoxicated patients, and the concentrations of creatine and creatinine were quantified. High creatine concentrations in serum samples were observed which may lead to high serum creatinine despite normal kidney function as creatine is converted to creatinine in proportion to its concentration.     

Dissipation of Endosulfan and Dichlorvos Residues In/On Cauliflower Curds

Dissipation behaviour of endosulfan and dichlorvos in/on cauliflower, variety Snowball-16, was studied during rabi season (Sep.–March) 2003–2004. Endosulfan and dichlorvos were sprayed @ 350 and 110g a.i. with 115 g a.i., respectively, 80 days after transplanting. Samples were taken at the interval of 0 (1h after spray), 3, 5, 7, and 10 days after spray (DAS) in triplicate and residues were estimated on GC-ECD system equipped with capillary column. The initial deposits of 3.452 and 0.295μgg⁻¹ of endosulfan and dichlorvos dissipated to 0.084 (97.56%) and 0.009 (96.95%), respectively after 10 DAS. Residues of endosulfan reached below maximum residue limit of 2μgg⁻¹ one day after spray and of dichlorvos were below MRL value of 0.5μgg⁻¹ even on 0 day. Dissipation pattern followed first order kinetics for both the insecticides with half life periods of 1.81 and 2.08 days for endosulfan and dichlorvos, respectively.     

超高效液相色谱法测定土壤中微量阿特拉津

采用超高效液相色谱仪,建立了土壤中微量阿特拉津的快速检测方法.研究结果表明:采用反相C18色谱柱,以甲醇/水(70:30,v/v)为流动相,流速为0.2 ml/min,柱温为30℃,检测波长为220 nm条件下,在12.5～1000μg/L质量浓度范围内线性关系良好(r=0.9999),检出限0.18×10-3 mg/...