Microdetermination Of Carbon Research Articles

The microdetermination of carbon and hydrogen in compounds containing alkali and alkaline earth metals

Organic compounds containing alkali and alkaline earth metals have been analyzed for carbon and hydrogen by combustion of the sample which has been covered with tungsten trioxide. Tungsten trioxide is superior to the reagents previously used for this purpose.

Use of Capillary Trap in Microdetermination of Carbon

Use of Capillary Trap in Microdetermination of Carbon

Ammonium Sulfamate as Substitute for Lead Peroxide in Microdetermination of Carbon and Hydrogen

Ammonium Sulfamate as Substitute for Lead Peroxide in Microdetermination of Carbon and Hydrogen

The micro-determination of carbon and hydrogen in organic compounds containing phosphorus

Several reagents have been examined for use in the micro-determination of carbon and hydrogen in organic compounds containing phosphorus for which low carbon values had previously been reported. Tungstic oxide was found to be the most convenient reagent for this purpose. A modification of the procedure of Friedrich was used throughout this investigation which is suitable for universal application.

炭水素分析値の季節的変動について

1) Seasonal variation of the results in the micro determination of carbon and hydrogen was discussed statistically from the results of the test analyses. 2) The micro-balances used had an accuracy of σw_??_2λ, sucrose of 2_??_4mg was used chiefly as the test material, and its contents of carbon and hydrogen were determined after the method of PREGL with some modifications using an automatic controlled combustion apparatus(3) 3) In 406 analyses (during 2.5 years), C% found showed a good consisteney with that calculated, namely mean error=+0.025% and σc=0.15%. No special care for the air conditioning was taken, yet no seasonal variation of the data was observed (Table 1 ). As somewhat higher results (ca. 0.2%) were expected in summer by the diffusion of the humidity into the absorption tube, it was supposed that the sample might absorb humidity from the air while it was being weighed. 4) In 108 analyses (during 1 year), H% found showed a good consistency with that calcu-lated on the average (mean error=-0.03%), but the fluctuation of the data (OH=0.19%) was somewhat larger than that of C%. Besides, H% found was high in summer and low in winter. These facts might be explained as follows. a) The amount of water introduced into the reaction tube while the platinum boat was taken out and in it might be canceled, on the average, by the amount of water temporarily taken hold by PbO2. b) But the amount of the former was high in summer and low in winter, and that of the latter might not be constant in every determination.

Use of V205 in Microdetermination of Carbon and Hydrogen

Use of V205 in Microdetermination of Carbon and Hydrogen

Calculator for Selection of Sample Weights in Microdetermination of Carbon and Hydrogen

Calculator for Selection of Sample Weights in Microdetermination of Carbon and Hydrogen

Microdetermination of carbon in compounds containing alkali metals

Wenn organische Verbindungen auser Alkalimetallen auch noch eine zumindest aquivalente Menge Schwefel enthalten, so besteht der Verbrennungsruckstand aus Alkalisulfat. Auf Grund dieser Beobachtung wird darauf hingewiesen, das sich auser Kaliumdichromat und Vanadiumpentoxyd auch Kaliumpersulfat als oxydierender Zusatz zur organischen Substanz fur die Verdrangung des Kohlendioxyds aus der Asche eignet.

Rapid micro combustion methods for the determination of elements in organic compounds

Advantages of the rapid combustion process for the micro determination of carbon and hydrogen, sulphur, and halogen are discussed, and methods for their estimation are described which have been adopted for routine analysis.

The micro-determination of carbon and hydrogen in fluorine-containing organic compounds

The sample is burned in a silica combustion tube, using a 4 ml per minute oxygen stream. Oxidation of the combustion products is completed by passing them over a platinum contact heated to 750°C, after the manner ofFriedrich. Silver wool at the same temperature removes sulphur and halogens, including the fluorine from any hydrogen fluoride produced, and granular sodium fluoride at about 270°C is used to absorb silicon tetrafluoride.

Microdetermination of Carbon and Hydrogen in Organic Compounds

Microdetermination of Carbon and Hydrogen in Organic Compounds

The absorption of nitrogen oxides in the micro determination of carbon and hydrogen

The examination of a number of reagents in an attempt to Und a. more convenient absorbent for nitrogen oxides, has revealed that manganese dioxide is very active. Granules of the reagent at room temperatures have been used successfully as an external absorbent for nitrogen oxides in the micro determination of carbon and hydrogen, using both the rapid and conventional combustion methods. A modified combustion tube packing has been developed in order to avoid retention of nitrogen dioxide in the water absorption tube when the conventional slow combustion method is used. In the rapid combustion method no special precautions were found to be necessary.

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Pressure Regulator for Use in Microdetermination of Carbon and Hydrogen

Pressure Regulator for Use in Microdetermination of Carbon and Hydrogen

Automatic Microdetermination of Carbon and Hydrogen

Automatic Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Micro-determination of carbon by wet combustion

Micro-determination of carbon by wet combustion

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen

Microdetermination of Carbon and Hydrogen