摘要:

A method has been developed for the determination of sodium in alumina using a selective ion electrode. The alumina sample is dissolved in ammonium hydrogen fluoride in platinum crucibles or sintered with boric acid using either platinum, nickel, or zirconium crucibles. Either dissolution technique completely extracts all available sodium. After dissolution, and in the presence of citrate to prevent aluminum hydroxide precipitation, the pH is adjusted to 8.7 with ammonium hydroxide, and the sodium concentration is determined by a sodium selective ion electrode.

ISSN:0003-2719    

DOI:10.1080/00032717508059041

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

The performance of a liquid-membrane electrode using a synthetic, neutral carrier in o-nitro-phenyl-n-octyl-ether as membrane component in a PVC matrix, in the presence of sodium tetra-phenyl-borate, is described. Selectivities, working range, lifetime and anion interference are discussed. The electrode makes possible the measurement of calcium ion activities in the range 10−1M to 10−6M in unbuffered and in the range 10−1M to 10−8M in calcium buffered systems respectively. The selectivities of calcium over protons, magnesium, sodium and zinc are 25,000, 26,000, 2,800 and 7,100, respectively, and are far superior than those reported for other calcium sensors.

ISSN:0003-2719    

DOI:10.1080/00032717508059042

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Indirect atomic absorption spectrometric and spectrophotometric methods for the determination of tungsten have been developed based on the precipitation of lead(II) tungstate and the measurement of the excess lead(II) in the supernate. The optimum Concentration ranges are approximately 3–30 ppm of tungsten on the basis of sample solution.

ISSN:0003-2719    

DOI:10.1080/00032717508059043

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A copper wire atomizer was used to determine mercury by atomic absorption spectroscopy. Sampling was accomplished by either pipetting a few microliters on to the wire or by submerging the wire in the sample solution. In both cases, the mercury is reduced at the copper surface and forms an amalgam. If the sample was made acidic most interferences were avoided.

ISSN:0003-2719    

DOI:10.1080/00032717508059044

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Procedures are described for the determination of serum iron and iron binding capacity using the chromogenic reagent 4-(2-pyridylazo) resorcinol (PAR). The high molar absorptivity of the iron (II) PAR complex makes possible an approximate two fold increase in sensitivity over previous methods. The described procedures have few interferences, and give linear results for samples containing 0 – 750 μg/dl of iron.

ISSN:0003-2719    

DOI:10.1080/00032717508059045

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

A new spectrofluorometric method for the determination of beryllium using 1-hydroxy-2-carboxyanthraquinone as the reagent is described. A study of the interference by foreign ions was also completed.

ISSN:0003-2719    

DOI:10.1080/00032717508059046

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor

摘要:

Dilutions on the AutoAnalyzer up to a 1200 : 1 ratio are used to analyze nitrate levels in water over the range 2 μg/1 to 250 mg/l N.

ISSN:0003-2719    

DOI:10.1080/00032717508059047

出版商:Taylor & Francis Group    

年代:1975

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:10.1080/00032717508059040

出版商:Taylor & Francis Group    

年代:1975

数据来源: Taylor