Method for mensurating content of niobium by method of separating weights of sodium sulfite - tannic acid

A technology of sodium sulfite and tannic acid, which is applied in the preparation of test samples, the use of material absorption weighing, color/spectral characteristic measurement, etc., can solve the problems of expensive instruments, low productivity, large limitations, etc., and reach the determination range Improvement, low cost, and limited limitations

Inactive Publication Date: 2007-07-25
北京冶科电子器材有限公司
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Problems solved by technology

[0003] The purpose of the present invention is to provide a new type of method improved on the basis of the original tannic acid hydrolysis precipitation gravimetric method for the problems of large errors, low productivity, large limitations, and expensive instruments in the existing niobium content determination method. Sodium sulfite-tannin separation gravimetric method for determination of niobium content

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  • Method for mensurating content of niobium by method of separating weights of sodium sulfite - tannic acid

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Embodiment Construction

[0011] A kind of sodium sulfite-tannin separation gravimetry method for measuring niobium content comprises the following steps:

[0012] (a) Place the sample in a beaker and dissolve it completely with nitric acid and hydrofluoric acid until the sample is completely dissolved, then add perchloric acid, and use perchloric acid fumes to drive away the silicon contained in the sample;

[0013] (b) Add sodium sulfite and tannic acid and heat to boil to hydrolyze niobium and precipitate and separate; filter and wash the precipitate, put it together with the filter paper in the original beaker, add nitric acid and perchloric acid to destroy the filter paper, then add sulfuric acid, and heat until smoking , after dissolving the produced precipitate, add sodium sulfite and tannic acid again, heat and boil to hydrolyze the niobium and precipitate and separate it, and weigh the mass of niobium pentoxide after ashing and burning;

[0014] (c) Calculate the mass fraction of niobium eleme...

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Abstract

A method for determining Nb content by utilizing sodium sulfite-tannic acid separation gravimetric means includes placing precipitated niobic acid and filtering paper into original beaker after sodium sulfite-tannic acid is added, adding nitric acid and perchloric acid to destroy filtering paper, dissolving and precipitating sulphuric acid by smoking, finally carrying out ashing-burning treatment and calculating out Nb content according weighing-result.

Description

technical field [0001] The invention relates to a method for determining niobium content by sodium sulfite-tannin separation gravimetric method, especially a method for determining niobium content in amorphous and precision alloys. Background technique [0002] The existing methods for determining the content of niobium in amorphous or precision alloys mainly include tannic acid hydrolysis precipitation gravimetric method, photometric method, and inductively coupled plasma emission spectrometry, but the above methods all have shortcomings. In the traditional tannic acid hydrolysis precipitation gravimetric method, in the process of determining niobium content, the sample to be tested must be filtered, washed, dried, ashed, and burned to form niobium oxide, and then melted with potassium pyrosulfate, or hydrofluoric acid After the acid and sulfuric acid are dissolved, secondary precipitation and secondary burning are carried out to separate the impurities adsorbed by the prec...

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Application Information

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IPC IPC(8): G01N5/02G01N1/34G01N21/27
Inventor 全炳权温泉王姝
Owner 北京冶科电子器材有限公司
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