摘要:

A simple and rapid procedure was developed for the flow injection (FI) pectrophotometric determination of carbofuran in pesticides formulations. The determination was based on the alkaline hydrolysis, at room temperature, of the carbofuran to yield carbofuran-phenol which can be coupled with diazotized sulphanilic acid in order to achieve an appropriate selectivity and sensitivity. The calibration graph is linear over the range 0.5-60 mg/L of carbofuran. The method has provided a detection limit of 0.5 mg / L, and the precision was better than 0.6% (R.S.D.) at a throughput of 80 samples per hour.

ISSN:0003-2719    

DOI:10.1080/00032719908542841

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

A simple flow injection photometric method for the determination of copper was developed based on the formation and liquid-liquid extraction of the analyte-bathocuproine-perchlorate ternary complex. The analytical reaction of complex formation is integrated with the continuous liquid-liquid extraction procedure. A hollow fiber-type membrane separator was specially constructed for the determination. The analytical properties like sensitivity, precision, accuracy and rapidity were evaluated. The sensitivity of the method depends on the injection volume. By using an injection volume of 0.6 ml, the detection limit (3σ) found was 15 ng ml−1copper, with a determination range of 48 - 3000 ng/ml. The repeatability of the method, expressed as the relative standard deviation, was in all instances less than 3.0%. The sampling rate was of 20 h−1. The accuracy of the method was tested with certified reference materials, and the mean error was calculated to be less than 5%. The method was successfully applied to the determination of copper in river water.

ISSN:0003-2719    

DOI:10.1080/00032719908542842

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor

摘要:

For a selective spectrophotometric determination of gallium(III) without interference of aluminium(III), firstly, the color developments between gallium(III) and various chelating azo-dyes; 4(2-pyridylazo) resorcinol (PAR), 2-(5bromo-2-pyridylazo)-5-diethylaminophenol (5-Br.PADAP) in the presence or absence of surfactant alone; cationic-, anionic-, nonionic-surfactants or surfactant combination; cationic-nonionic-, anionic-nonionic-, cationic-anionic mixed surfactants, were systematically investigated.

ISSN:0003-2719    

DOI:10.1080/00032719908542843

出版商:Taylor & Francis Group    

年代:1999

数据来源: Taylor