Method for determining content of calcium in calcium-silicon alloy by potentiometric titration

A calcium-silicon alloy and potentiometric titration technology, which is applied in the field of chemical analysis, can solve problems such as harsh conditions of use, high detection costs, and short service life, and achieve the goals of reducing analysis costs, improving precision and accuracy, and shortening the analysis cycle. Effect

Inactive Publication Date: 2017-02-15
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The key problems solved by the present invention are: ① how to simplify the separation process of dissolved samples without affecting the analysis results; ② traditional calcium ion selective electrodes are expensive, use harsh conditions, and have a short service life. Usually, they can only be used for about half a year, resulting in detection costs. high

Method used

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  • Method for determining content of calcium in calcium-silicon alloy by potentiometric titration
  • Method for determining content of calcium in calcium-silicon alloy by potentiometric titration
  • Method for determining content of calcium in calcium-silicon alloy by potentiometric titration

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Experimental program
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Effect test

Embodiment

[0037] Take silicon-calcium alloy standard samples GSB03-2197-2008 and GSBH12002-90 for testing.

[0038] Specifically include the following steps:

[0039] 1. Sample treatment: first calibrate the concentration of EDTA with calcium standard solution, and then take 0.025 mol / L CuSO 4 Put 10 mL of the solution in a beaker, add 10 mL of ammoniacal ammonium chloride buffer solution, and titrate CuSO with EDTA 4 To the end point, record the volume V mL, and then take 0.025 mol / L CuSO 4 Solution 10mL was placed in a beaker, and V mL of EDTA was quantitatively added to form a 1:1 CuEDTA solution.

[0040] Weigh 0.1000 g of samples respectively and place them in a polytetrafluoroethylene beaker, add 10 mL of nitric acid, and drop about 5 mL of hydrofluoric acid. Decompose while cooling with water. After the violent reaction stops, add 10 mL of perchloric acid, evaporate until white fumes of perchloric acid appear, and concentrate its volume to about 1 mL.

[0041]Remove the polyt...

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Abstract

The invention discloses a method for determining a content of calcium in calcium-silicon alloy by potentiometric titration. An automatic potentiometric titration instrument and a copper ion selective electrode are adopted to realize accurate determination of the content of calcium in the calcium-silicon alloy. A sample is dissolved in nitric acid (concentrated)-hydrofluoric acid, and ammonium hydroxide separation is realized once each time perchloric acid smokes. Compared with the Chinese standard GB / T 4700.2-1988, the method has advantages that a sample dissolving and separation process is simplified while uniform sample dissolving effects are achieved. Automatic end point determination is realized through potential jump by the aid of the automatic potentiometric titration instrument, errors caused by manual end point determination are reduced, and precision and accuracy of analysis results are improved. By replacement of a calcium ion selective electrode with the copper ion selective electrode, the service life of the electrode is prolonged, and analysis cost is saved.

Description

technical field [0001] The invention relates to a method for measuring calcium content in silicon-calcium alloy by potentiometric titration, which belongs to the technical field of chemical analysis. Background technique [0002] Silicon-calcium alloy is a composite alloy composed of elements such as silicon, calcium and iron, and is an ideal composite deoxidizer and desulfurizer. It is widely used in the production of high-quality steel, low-carbon steel, stainless steel and other special alloys such as nickel-based alloys and titanium-based alloys. It is also suitable as an inoculant for cast iron and an additive in the production of nodular cast iron. The inspection of the calcium content in the current calcium-silicon alloy mainly adopts the EDTA complexometric titration method of visual titration (GB / T 4700.2-88). It takes a long time, and expensive platinum dishes are used in the sample dissolution process, and the detection cost is high. In addition, the visual titr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
CPCG01N31/164
Inventor 赵琎赵艳兵曹吉祥戴学谦
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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