摘要:

The use of phenol and alkaline hypochlorite has been investigated for the spectrophotometric estimation of methylamine. The reagents react with methylamine forming an intensely blue colored dye, the maximum absorption for which is observed at 630 nm. The rate of the reaction is slow. Sodium nitroprusside is added to enhance the sensitivity and rate of the reaction. The rate is also enhanced by raising the temperature of the reaction. The formation of the indophenol dye is pH sensitive, maximum intensity being observed at pH 10.5. The reaction mixture buffered at pH 10.5, is thermostated at 37°C and its absorbance measured at 630 nm after 3 hours. The system obeys Beer's law up to 15 ppm with slight deviation in the lower ranges. Concentrations as low as 0.5 ppm of methylamine can be estimated in a 1 cm cell.

ISSN:0003-2719    

DOI:10.1080/00032718108081436

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

It has been found that certain insecticides, rodenticides, herbicides and fungicides on solid state supports give fluorescence when sprayed with solutions containing 2-diphenylacetyl-1,3-indandione-1-imine derivatives. Compounds that give high fluorescence include DDT, Chlordane, Heptachlor, Toxaphene, Methoxychlor, Diazinon, Carbophenothion, DDVP, Warfarin, phenoxyacetic acid, methyl l-naphthaleneacetate, Chloranil, Dichlone, and 1,4,5,6,7,7-hexachloro-N-(ethylmercuri)-5-norbornene-2,3-dicarboximide. The effect is based on fluorescence enhancement of the 2-diphenylacetyl-1,3-indandione-l-imine derivatives as a result of molecular complexation with the compound detected.

ISSN:0003-2719    

DOI:10.1080/00032718108081437

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A rapid, simple and sensitive spectrofluorimetric determination of cadmium based on the formation of a fluorescent chelate with benzyl-2-pyridylketone 2-pyridylhydrazone is described. In darkness, the fluorescence development is instantaneous and remains stable for 1 h. The detection limit is 11 ppb. The influence of reaction variables and the effect of foreign ions are discussed.

ISSN:0003-2719    

DOI:10.1080/00032718108081438

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

Isolation of organic constituents from water frequently involves an extraction with a large volume of organic solvent which must be reduced to achieve the desired sensitivity. The objective of this research was to evaluatecommonsolvent evaporation techniques to determine which are acceptable for use in pollutant analysis. Techniques for solvent reduction from 200 to 10 mL (macro) and 8 to 0.2 mL (micro) were evaluated. The macro concentration technques included Kuderna-Danish (K-D) concentration, rotary evaporation, evaporation on a hot plate in an Erlen-meyer flask, and heated nitrogen blowdown in an Erlenmeyer flask. The micro techniques included micro K-D concentration, nitrogen blowdown, and nitrogen blowdown with a modified Snyder column. A series of model compounds covering a wide range of boiling points (108° to 323°C) and polarity was used. Based upon recovery efficiency alone, nitrogen blowdown was significantly superior to the other macro techniques; however, its extreme slowness gave K-D the highest Figure of Merit. With methylene chloride as the solvent, nitrogen blowdown with a column was the superior technique.

ISSN:0003-2719    

DOI:10.1080/00032718108081439

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

The solubilities and Kspvalues at 25°C for the following anion salts of nitron are reported: VO4=, Cro4=, Cr2O7=,WO4=, MoO4=, BF4−, NO3−, NO2−, SeO3=, S2O8=, SCN−, Fe(CN)6−3, Fe(CN)6−4, Fe(CN)5NO=, I−, IO4−, CIO3−, CIO4−, BrO3−, and picrate−. A total of 58 anions were tested.

ISSN:0003-2719    

DOI:10.1080/00032718108081440

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A nitron-polyvinylbenzyl chloride polymer was found to have a strong preference for oxidizing anions such as NO3−, NO2−, ReO4−, MnO4−, C1O4−, C1O3−, and Cr2O7=but not for the non-oxidizing anions SO4=, HSO4−, H2PO4=, HPO4=, PO4=, OH−, CO3=, HCO3−, F−, C1−, and Br−.

ISSN:0003-2719    

DOI:10.1080/00032718108081441

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

A solid state oxalate sensor is reported utilizing a commercial ion-selective electrode, the SelectrodeTM. Comparative measurements in aqueous solution of similar carboxylate ions and common inorganic anions, indicates appreciabl'e selectivity for oxalate. The SelectrodeTMwas activated with a mixture of silver sulphide, lead sulphide, and lead oxalate.

ISSN:0003-2719    

DOI:10.1080/00032718108081442

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor

摘要:

This is a scanned image of the original Editorial Board page(s) for this issue.

ISSN:0003-2719    

DOI:10.1080/00032718108081435

出版商:Taylor & Francis Group    

年代:1981

数据来源: Taylor