Analytical Communications最新文献_第7页

Determination of nicotine in tobacco by molecularly imprinted solid phase extraction with differential pulsed elution 分子印迹固相萃取-差分脉冲洗脱法测定烟草中的尼古丁

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A902509J

W. Mullett, E. Lai, B. Sellergren

引用次数: 70

The estimation of lanthanum by air-acetylene atomic absorption spectrophotometry using an indirect procedure 空气-乙炔原子吸收分光光度法间接测定镧

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900331B

S. J. Wilson, P. Marquis

{"title":"The estimation of lanthanum by air-acetylene atomic absorption spectrophotometry using an indirect procedure","authors":"S. J. Wilson, P. Marquis","doi":"10.1039/A900331B","DOIUrl":"https://doi.org/10.1039/A900331B","url":null,"abstract":"A method for measuring the release of lanthanum from some ceramic dental materials was required using air–acetylene atomic absorption spectrophotometry (AA-AAS), and an analytical procedure was devised based on the release of calcium in the presence of phosphate by lanthanum addition. The extent of phosphate interference in the determination of calcium by AA-AAS was assessed, and it was shown that the absorbance of a 10 ppm Ca standard was reduced by 45% in the presence of 20 ppm or more of phosphate (as PO4). Analysis of standards containing 10 ppm Ca, 20 ppm PO4, and lanthanum added at concentrations up to 100 ppm showed rapid increase of calcium absorbances from 10 to 40 ppm La, after which absorbance increased slowly to a constant value at 90 ppm La. This corresponded to the value of a 10 ppm Ca standard solution containing no phosphate. Closer examination of solutions containing 10–40 ppm La revealed a quantitative relationship between lanthanum levels and calcium absorbances which deviated slightly from Beer’s law. Consequent analysis of solutions containing various amounts of lanthanum in the presence of 10 ppm Ca and 20 ppm PO4 followed by repeated analysis of standards demonstrated good precision and reproducibility. The relative standard deviation for repeated standard analyses was 4.2%, and the detection limit was 0.6 ppm La representing an increase of sensitivity of approximately 100 times over lanthanum determinations using nitrous oxide–acetylene techniques. The method indicates that similar procedures may be used to estimate elements which exercise similar release effects.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"163 1","pages":"31-33"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78068773","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A photoelectric method for analyzing cell-free apoptosis induced by dATP dATP诱导细胞游离凋亡的光电分析方法

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900317G

Y. Ci, Chun-yang Zhang, Jun Feng, Ai-dong Lang, Chun‐hui Huang, Zhengfan Jiang

引用次数: 2

At-line coupling of surface-enhanced resonance Raman spectroscopy and reversed-phase ion-pair chromatography 表面增强共振拉曼光谱与反相离子对色谱的联机耦合

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A903254A

R. M. Seifar, R. J. Dijkstra, U. Brinkman, C. Gooijer

引用次数: 14

An approach to the identification of selenium species in yeast extracts using pneumatically-assisted electrospray tandem mass spectrometry 利用气动辅助电喷雾串联质谱法鉴定酵母提取物中硒的种类

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A900319C

C. Casiot, V. Vacchina, H. Chassaigne, J. Szpunar, M. Potin-Gautier, R. Łobiński

引用次数: 100

Study on fluorescence of the Tb(III)–enoxacin system and the determination of enoxacin Tb(III) -依诺沙星体系的荧光研究及依诺沙星的测定

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A902452B

Y. Fangtian, J. Linpei, Z. Huichun

引用次数: 16

Direct measurement of atmospheric formaldehyde using gas chromatography-pulsed discharge ionisation detection 气相色谱-脉冲放电电离检测法直接测定大气中甲醛

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A809762C

M. Hunter, K. Bartle, P. Seakins, A. Lewis

{"title":"Direct measurement of atmospheric formaldehyde using gas chromatography-pulsed discharge ionisation detection","authors":"M. Hunter, K. Bartle, P. Seakins, A. Lewis","doi":"10.1039/A809762C","DOIUrl":"https://doi.org/10.1039/A809762C","url":null,"abstract":"A gas chromatographic system has been developed for the direct analysis of atmospheric formaldehyde and other oxygenated hydrocarbons. This method utilises the trapping of analytes in a loop cooled with liquid nitrogen, separation by gas chromatography and then subsequent detection using a pulsed discharge helium ionisation detector (pdHID). The detection limit of this instrument is estimated to be 32 parts per trillion by volume (pptv) for 0.2 l of gas sampled at a flow rate of 30 ml min–1 (S/N at 4:1). A number of other compounds have been monitored simultaneously using this method, including higher molecular weight aldehydes and acetone. Continuous measurement of formaldehyde can be performed with a time resolution of 15 min, with longer analysis times required for inclusion of other species. Calibrations were performed using a permeation tube instrument for both formaldehyde and acetone. A linear response has been observed for formaldehyde sample volumes of 60–200 ml of a 272 ppbv sample (20–68 ng). For acetone a linear response was observed from 175–360 ml of a 30 ppbv standard (12–26 ng). A flame ionisation detector (FID) was also utilised during system development to confirm separation of formaldehyde from atmospheric hydrocarbons.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"94 1","pages":"101-104"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86743579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 33

A new sandwich-type assay of estrogen using piezoelectric biosensor immobilized with estrogen response element 用雌激素反应元件固定压电生物传感器的新型三明治式雌激素检测方法

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A902872B

Mo Zhihong, Long Xiaohui, F. Weiling

{"title":"A new sandwich-type assay of estrogen using piezoelectric biosensor immobilized with estrogen response element","authors":"Mo Zhihong, Long Xiaohui, F. Weiling","doi":"10.1039/A902872B","DOIUrl":"https://doi.org/10.1039/A902872B","url":null,"abstract":"A new methodology, sandwich-type monitoring assay system using an estrogen response element (ERE)-immobilized piezoelectric biosensor in combination with flow injection technique, has been developed for analysis of estrogen (E). The principle of the assay is that the estrogen receptor (ER) captures estrogen and then the complex is bound with ERE immobilized on the sensor. It was confirmed that initial binding of the ERE with ER is significantly accelerated by the formation of an E–ER complex. This kinetic difference was monitored by real-time measurement of the resonance frequency of the ERE piezoelectric biosensor and applied to detect 17β-estradiol. The calibration graph was linear in the range 10–100 nmol l–1 with a detection limit of 7.8 nmol l–1, an RSD of 5.9% for 50 nmol l–1 (6 replicates), and one run time of 4 min. Gradient flow injection on-line connection to an array of ERE piezoelectric biosensors is in progress for the simultaneous determination of endogenous and synthetic estrogens in drinking water and urine. In comparison with present chromatographic methods coupled with MS, the proposed technique is simple, flexible and cheap and has great potential in applications such as field and on-site monitoring and screen testing of endocrine disruptors.","PeriodicalId":7814,"journal":{"name":"Analytical Communications","volume":"2 1","pages":"281-283"},"PeriodicalIF":0.0,"publicationDate":"1999-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84101921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 39

Depth profiling of a Co-implanted silicon wafer by total-reflection X-ray fluorescence analysis after repeated oxidation and HF-etching 重复氧化和hf刻蚀后共植入硅片的全反射x射线荧光分析

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A809804B

R. Klockenkämper, A. Bohlen

引用次数: 13

An acrylamide-based molecularly imprinted polymer for the efficient recognition of optical amino acid hydantoins 一种基于丙烯酰胺的分子印迹聚合物，用于光学氨基酸醛酸的高效识别

Analytical Communications Pub Date : 1999-01-01 DOI: 10.1039/A902025J

Jie Zhou, Xiwen He, Yijun Li

引用次数: 14