摘要:

An activation analysis procedure has been developed to determine manganese and copper serum values in one milliliter of serum or less rapidly and with good precision. The sample is irradiated in a neutron flux of 1012cm−2sec−1for two hours followed by nitric acid digestion. The activity plus carrier is absorbed from saturated lithium chloride solution on Dowexl-8 contained in a syringe. After washing the resin with more lithium chloride, the syringe is counted in a five inch well crystal multichannel spectrometer. The carrier is washed off the syringe by dilute acid and analyzed. The sample concentration is determined by comparison to irradiated standards correcting the unknown for decay and chemical yield.

ISSN:0003-2719    

DOI:10.1080/00032716908051296

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A “bench top” microcalorimeter has been designed and constructed. This instrument, and a more conventional microcalorimeter previously described, have been applied to several analytical determinations including both inorganic and enzymatic reactions. Because of the stability, yet rapid equilibration time of the bench top calorimeter, multiple analyses may be performed. The ease of operation, nearly universal applicability, and the possibility of obtaining thermodynamic as well as kinetic data simultaneously, make this technique extremely useful.

ISSN:0003-2719    

DOI:10.1080/00032716908051297

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

A spectrophotometric procedure is described for the simultaneous determination of osmium and ruthenium in the form of bromo complexes. It was found that a blue ruthenium-thiourea complex could be formed in 6.7MHBr solutions while the osmium could be maintained as the hexabromoosmate complex. Absorption maxima were at 620 μ for the ruthenium complex and at 446 μ for the osmium complex. Molar absorptivities for the ruthenium complex were 2.47 × 103at 620 μ and 763 at 446 μ. For the osmium complex molar absorptivities were 328 at 620 μ and 6.81 × 103at 446 μ. The method is useable over the range of 5 to 30 ppm with an absolute error of = 1 ppm over the range. Other platinum metals interfere.

ISSN:0003-2719    

DOI:10.1080/00032716908051298

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The electrochemical behavior of sodium diethyldithiocarbamate has been studied. A method has been developed to determine trace amounts of the reagent by preparatory electrolysis at a suitable potential which causes the sparingly soluble electrochemical product to precipitate on a small graphite electrode. The inverse polarogram gives a current which can be evaluated quantitatively, produced by the re-dissolving of the film on the electrode. Sodium diethyldithiocarbamate can also be used for electrochemically concentrating cobalt in the form of a sparingly soluble compound of Co(III) by measuring the current required to reduce (re-dissolve) the compound. The electrochemical oxidation reaction of sodium diethyldithiocarbamate to give insoluble films could be used for indirect determination of the metal ions which interact with the reagent.

ISSN:0003-2719    

DOI:10.1080/00032716908051299

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The enzyme urease was immobilized in a layer of acrylamide polymer on the surface of a Beckman cationic electrode sensitive to ammonium ion. The substrate urea diffuses to the enzyme electrode and reacts with the immobilized enzyme to produce ammonium ion at the surface of the glass electrode. By placing a thin film of cellophane around the enzyme gel layer to prevent leaching of urease into the surrounding solution, an electrode could be used continuously for over 21 days at 25[ddot]C with no loss of activity.

ISSN:0003-2719    

DOI:10.1080/00032716908051300

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

The Orion Perchlorate Ion Activity Electrode also is sensitive to perrhenate and thiocyanate activities. Response is Nernstian over several orders of magnitude, with detection limits about 10−6Ffor perrhenate and 10−5Ffor thiocyanate. Titrations can be carried out with ±0.5% relative standard deviations at the 10−1to 10−2Fconcentration level. Titration curves for addition of mercury (II) to thiocyanate, chloride, bromide, and iodide are U-shaped. The electrode appears to be highly sensitive to the anionic mercury-halide complexes formed in the early stages of these titrations. The data are consistent with the stabilities of the complexes.

ISSN:0003-2719    

DOI:10.1080/00032716908051301

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor

摘要:

Several experimental parameters have been found to affect the intensity of microwave excited electrodeless discharge emission at the cadmium resonance line (228.8 nm.). A thorough study of the effect of pressure of the fill gas, microwave power applied to the tube; and weight of Cd introduced into the tube has been accomplished. Direct comparisons of Cd resonance emission for the cases of He, Ne, Ar and air fill gases are presented. From these studies preductions of optimum conditions for construction and operation of Cd electrodeless discharge lamps may be made.

ISSN:0003-2719    

DOI:10.1080/00032716908051302

出版商:Taylor & Francis Group    

年代:1969

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:10.1080/00032716908051295

出版商:Taylor & Francis Group    

年代:1969

数据来源: Taylor