摘要:

Many molten chlorides are used in industry for the electrolytic production of metals. In such processes, the oxoacidity level is crucial with respect to the cost and the yield.

ISSN:0003-2719    

DOI:10.1080/00032718208064449

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The working conditions for the double addition method of potentiometric determination of unknown concentrationsCKof ions from the electromotive forces of appropriate ion-selective electrode cells have been analyzed in terms of operational equations, standard concentrations for additions, volume ratios of second to first additions, etc. The best operational conditions for minimizing errors onCXare discussed.

ISSN:0003-2719    

DOI:10.1080/00032718208064450

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Spectrophotometric data used in connection with HAacidity function yield pK1=−3.3(K1= [H2SeO3][H+]/[H3SeO3+]);potentiometric and spectral measurements give for pK2and pK3data in agreement with the literature. At pH > 10 selenite undergoes a fast photochemical reaction, preceded by a rapidly established acid-base equilibrium. Products of this reaction undergo a slow reaction which is second order in selenite.

ISSN:0003-2719    

DOI:10.1080/00032718208064451

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The florescent characteristics of the complex formed by 1, 5-dihydroxyanthraquinone with Mg(II) in aqueous ethanol (λex490 nm,λem=600 nm; pHap=9.1-9.6; 10% H2O; reagent concentration=4×10−5M) are described. The stoichiometry and the stability constant (1:1 and log K=4.90) are determined. A new fluorometric method for the determination of 10-100 ppb Mg(II) is proposed.

ISSN:0003-2719    

DOI:10.1080/00032718208064452

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Carboxylic acids were determined spectrophotometrically by converting them into 2-nitrophenylhydrazides. The coupling reaction of carboxylic acids with 2-nitrophenylhydrazine was effected by a water-soluble carbociimide, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide, and proceeded efficiently in aqueous solution buffered at pH 4.5 with pyridine and hydrochloric acid. The yields of hydrazides from acetic and benzoic acids were nearly quantitative. The reaction mixture was then made strongly alkaline, and after heating to reduce the blank absorbance, the absorbance of the hydrazide was measured at around 540 nm. Calibration curves of various carboxylic acids were linear between 0.02 and 0.5 μmol through the origin.

ISSN:0003-2719    

DOI:10.1080/00032718208064453

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Analysis of small samples of fish eggs, rat brain sections and aquatic macro-invertebrates for 78 PCB congeners, hexachlorobenzene, octachlorostyrene, p, p′-DDE and mirex is described. With a gas chromatograph equipped with an Apiezon L coated glass capillary and electron capture detector capable of determining 10 ng/ml of analyte in hexane, a 10 mg sample may be analyzed with a precision of better than ±5% relative standard deviation.

ISSN:0003-2719    

DOI:10.1080/00032718208064454

出版商:Taylor & Francis Group    

年代:1982

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:10.1080/00032718208064448

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor