The Journal of Automatic Chemistry最新文献_第5页

The automatic methods group newsletter. 自动方法组通讯。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000217

引用次数: 0

Evaluation of the Dimension XL clinical chemistry system. Dimension XL临床化学系统的评价。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000023

N V Neelkantan, J P Mizzer, J Weinacht, D R Thompson, B Sener, D K Stille, W G Zhao, D Miller

引用次数: 0

An automated system for liquid-liquid extraction in monosegmented flow analysis. 单段流分析中液-液萃取的自动化系统。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000059

I Facchin, J J Rohwedder, C Pasquini

{"title":"An automated system for liquid-liquid extraction in monosegmented flow analysis.","authors":"I Facchin, J J Rohwedder, C Pasquini","doi":"10.1155/S1463924697000059","DOIUrl":"https://doi.org/10.1155/S1463924697000059","url":null,"abstract":"An automated system to perform liquid-liquid extraction in monosegmented flow analysis is described. The system is controlled by a microcomputer that can track the localization of the aqueous monosegmented sample in the manifold. Optical switches are employed to sense the gas-liquid interface of the air bubbles that define the monosegment. The logical level changes, generated by the switches, are flagged by the computer through a home-made interface that also contains the analogue-to-digital converter for signal acquisition. The sequence of operations, necessary for a single extraction or for concentration of the analyte in the organic phase, is triggered by these logical transitions. The system was evaluated for extraction of Cd(II), Cu(II) and Zn(II) and concentration of Cd(II) from aqueous solutions at pH 9.9 (NH(3)/NH(4)Cl buffer) into chloroform containing PAN (1-(2-pyridylazo)-2-naphthol) . The results show a mean repeatability of 3% (rsd) for a 2.0 mg l(-1) Cd(II) solution and a linear increase of the concentration factor for a 0.5mg l(-1) Cd(II) solution observed for up to nine extraction cycles.","PeriodicalId":22600,"journal":{"name":"The Journal of Automatic Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/S1463924697000059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27795080","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Signal enhancement techniques for chromatography detection systems. 色谱检测系统的信号增强技术。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S146392469700014X

K D Jackson, S J Walton, D Campbell

引用次数: 3

2. The Data Librarian: introducing the Data Librarian. 2. 数据馆员:介绍数据馆员。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000242

J Liscouski

引用次数: 3

pH electrode performance under automated management conditions. pH电极在自动化管理条件下的性能。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000266

J E Comer, C Hibbert

引用次数: 10

Application of experimental design to generate relevant information and representative calibration data. 应用实验设计生成相关信息和具有代表性的校准数据。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000278

S Schönkopf, D Guyot

引用次数: 0

Distinction and quantification of carry-over and sample interaction in gas segmented continuous flow analysis. 分段连续流分析中残余和样品相互作用的区分与定量。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000254

J Z Zhang

{"title":"Distinction and quantification of carry-over and sample interaction in gas segmented continuous flow analysis.","authors":"J Z Zhang","doi":"10.1155/S1463924697000254","DOIUrl":"https://doi.org/10.1155/S1463924697000254","url":null,"abstract":"The formulae for calculation of carry-over and sample interaction are derived for the first time in this study. A scheme proposed by Thiers et al. (two samples of low concentration followed by a high concentration sample and low concentration sample) is verified and recommended for the determination of the carry-over coeffcient. The derivation demonstrates that both widely used schemes of a high concentration sample followed by two low concentration samples, and a low concentration sample followed by two high concentration samples actually measure the sum of the carry-over coeffcient and sample interaction coefficient. A scheme of three low concentration samples followed by a high concentration sample is proposed and verified for determination of the sample interaction coeffcient. Experimental results indicate that carry-over is a strong function of cycle time and a weak function of ratio of sample time to wash time. Sample dispersion is found to be a function of sample time. Fitted equations can be used to predict the carry-over, absorbance and dispersion given sample times, and wash times for an analytical system. Results clearly show the important role of intersample air segmentation in reducing carry-over, sample interaction and dispersion.","PeriodicalId":22600,"journal":{"name":"The Journal of Automatic Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/S1463924697000254","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27794996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 25

Use of nitrous oxide as a purge gas for automated nitrogen isotope analysis by the Rittenberg technique. 使用氧化亚氮作为吹扫气体，通过里腾堡技术进行自动氮同位素分析。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000175

R L Mulvaney, S A Khan, G K Sims, W B Stevens

{"title":"Use of nitrous oxide as a purge gas for automated nitrogen isotope analysis by the Rittenberg technique.","authors":"R L Mulvaney, S A Khan, G K Sims, W B Stevens","doi":"10.1155/S1463924697000175","DOIUrl":"https://doi.org/10.1155/S1463924697000175","url":null,"abstract":"An apparatus that operates with an isotope-ratio mass spectrometer to automatically perform nitrogen isotope analyses by the Rittenberg technique was modified to permit the use of nitrous oxide (N(2)O) instead of Freon (CCl(2)F(2) or CHClF(2)) for the purging of air prior to hypobromite oxidation of ammonium-N to N(2) in a plastic microplate. Analytical performance was unaffected by the modifications. Up to 768 samples can be processed in a single loading, at a rate of 6 to 12 samples/h. Within the range of 0.2 to 20 atom % (15)N, isotope-ratio analyses of 50 to 200 mug of N using the automated Rittenberg apparatus (ARA) with a double-collector mass spectrometer were accurate to within 0.7%, as compared to manual Rittenberg analyses of 1 mg of N using the same mass spectrometer with a dual-inlet system. Automated analyses of 20mug of N were accurate to within 2%, and automated analyses of 10 mug of N were accurate to within 7%. The relative standard deviation for measurements at the natural abundance level (10 analyses, 20-200 mug of N) was < 0.04 %.","PeriodicalId":22600,"journal":{"name":"The Journal of Automatic Chemistry","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1997-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1155/S1463924697000175","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"27795091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

Technical note: New applications for on-line automated solid phase extraction. 技术说明:在线自动固相萃取的新应用。

The Journal of Automatic Chemistry Pub Date : 1997-01-01 DOI: 10.1155/S1463924697000199

J D Macfarlane

引用次数: 2