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Chemical analysis method for accurately measuring copper content in copper or copper additive

An accurate measurement and additive technology, applied in the field of chemical analysis, can solve the problems of high acid resistance requirements of vessels, great harm to operators, poor detection accuracy, etc., and achieves the effect of strong practicability, high accuracy and simple method.

Inactive Publication Date: 2020-12-01
HUNAN JINLIANXING SPECIAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a kind of energy Fast, convenient, low detection cost, low requirements for acid resistance of containers, can reduce operator hazards, high detection accuracy chemical analysis method to accurately measure copper content in copper or copper additives

Method used

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  • Chemical analysis method for accurately measuring copper content in copper or copper additive
  • Chemical analysis method for accurately measuring copper content in copper or copper additive
  • Chemical analysis method for accurately measuring copper content in copper or copper additive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079]A chemical analysis method for accurately measuring the copper content in copper or copper additives, including the following steps:

[0080]1) Prepare drugs: prepare nitric acid (1+1), potassium iodide solution with a concentration of 150g / L, 100g / L hydroxylamine hydrochloride solution, 100g / L potassium thiocyanate solution, sodium pyrophosphate solid (AR.), 10g / L of fresh starch solution.

[0081]2) Preparation and calibration of standard solution:

[0082]a) Preparation of 1mol / L sodium thiosulfate standard solution: Weigh 260g sodium thiosulfate pentahydrate in an Erlenmeyer flask, add an appropriate amount of boiled and carbon dioxide-free water to dissolve it, add 10g anhydrous carbonic acid After dissolving the sodium, filter it with cotton into a 1L volumetric flask, dilute it with carbon dioxide-free water to 1L, and then mix it evenly to obtain a 1mol / L sodium thiosulfate standard solution. Store it for two weeks before use.

[0083]b) Preparation of 0.02mol / L sodium thiosulfat...

Embodiment 2

[0103]The difference between Example 2 and Example 1 is that: Example 2 weighed 0.7009 grams of copper sample, and consumed a total of 21.93mL of 0.01997mol / L sodium thiosulfate standard solution. The result is that the mass fraction of copper is:

[0104]

Embodiment 3

[0106]The difference between Example 3 and Example 1 is that: Example 3 weighed 0.7062 grams of copper sample, and consumed 22.10 mL of 0.01997 mol / L sodium thiosulfate standard solution. The result is that the mass fraction of copper is:

[0107]

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Abstract

The invention discloses a chemical analysis method for accurately measuring the copper content in copper or a copper additive. The chemical analysis method comprises the following steps of 1) preparing a medicine, 2) preparing and calibrating a standard solution, 3) detecting a copper or copper additive sample, and 4) marking and calculating a result. According to the method, in a weakly acidic solution, sodium pyrophosphate is used for masking iron, and a hydroxylamine hydrochloride solution is used for eliminating nitric oxide; excessive potassium iodide solution is added, copper ions reactwith excessive potassium iodide to generate copper iodide precipitate, and quantitative iodine is separated out at the same time; and the separated iodine is titrated by using a sodium thiosulfate standard solution by taking a fresh starch solution as an indicator so as to determine the copper content in the copper or copper additive. The method can be used for analyzing the copper or copper additive with the copper content of more than or equal to 70 percent, and can meet the requirements of inspection of various copper or copper additive products in the industry.

Description

Technical field[0001]The invention relates to the technical field of chemical analysis, in particular to a chemical analysis method suitable for accurately measuring the copper content of copper or copper additives with copper content ≥ 70%.Background technique[0002]In the fierce market competition, the quality of the product is particularly important, and the testing requirements for each product are constantly improving. In addition to detecting the impurity elements of the substance, the direct detection of the purity of the substance is also very important. At present, the methods for determining the chemistry of copper and copper alloys in the national standard are: GB / T 5121.1-2008 copper and copper alloy chemical analysis methods, of which there are three analytical methods 1: direct electrolysis-atomic absorption spectrometry; 2. potassium permanganate oxidation of tellurium —Electrolytic atomic absorption spectrometry; 3: Electrolytic spectrophotometry, in which the instrum...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
CPCG01N21/78
Inventor 李云龙陈欢徐涛鸣
Owner HUNAN JINLIANXING SPECIAL MATERIALS CO LTD
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