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Method for detecting content of chromium in copper alloy

A detection method and technology for copper alloys, which are applied in the preparation of test samples, material excitation analysis, thermal excitation analysis, etc., can solve problems such as inaccurate detection results, and achieve the effects of high dissolution efficiency, simple method and small error.

Inactive Publication Date: 2017-05-24
武汉泛洲中越合金有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method that can completely dissolve the copper alloy sample to solve the problem of inaccurate detection results due to the inability to completely dissolve the existing detection methods.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of nitric acid solution: Mix analytically pure nitric acid with a concentration of 11 mol / L and water (volume ratio is 1:1).

[0034] Preparation of sulfur-phosphorus mixed acid: mixing analytically pure sulfuric acid and analytically pure phosphoric acid at a volume ratio of 1:1.

[0035] In this embodiment, the copper alloy sample is a particle not larger than 0.2g. Small particles can save the dissolution time and improve the detection efficiency while ensuring the detection result. The copper alloy sample is manganese brass containing silicon and chromium Standard substance (the standard value of chromium content is 0.24%).

[0036] (1) draw standard solution working curve:

[0037] Weigh five portions of 0.100g pure copper with an electronic balance and place them in a group of five 250mL conical flasks, pipette 0mL, 5mL, 10mL 10ug / mL chromium standard solution with 100- Pipette 0.5mL and 1.0mL 1000ug / mL chromium standard solution into conical flasks ...

Embodiment 2

[0064] Preparation of nitric acid solution: Mix analytically pure nitric acid with a concentration of 7.5 mol / L and water (volume ratio 1:2).

[0065] Preparation of sulfur-phosphorus mixed acid: mixing analytically pure sulfuric acid and analytically pure phosphoric acid in a volume ratio of 2:1.

[0066] In this embodiment, the copper alloy sample is a particle not larger than 0.2 g, and the copper alloy sample is a silicon-containing chromium bronze standard substance (the standard value of chromium content is 0.43%).

[0067] (1) draw standard solution working curve:

[0068] Weigh five portions of 0.100g of pure copper with an electronic balance and place them in a group of five 250mL conical flasks, pipette 0mL, 7.5mL, 15mL of 10ug / mL chromium standard solution with 100mL -1000ul adjustable volume pipette pipette 0.75mL, 1.5mL 1000ug / mL chromium standard solution into the Erlenmeyer flask respectively, then add 15mL nitric acid solution and 5mL sulfur-phosphorus mixed a...

Embodiment 3

[0088] Preparation of nitric acid solution: Mix analytically pure nitric acid with a concentration of 11 mol / L and water (volume ratio is 1:1).

[0089] Preparation of sulfur-phosphorus mixed acid: mixing analytically pure sulfuric acid and analytically pure phosphoric acid in a volume ratio of 2:1.

[0090] In this embodiment, the copper alloy sample is a particle not larger than 0.2 g, and the copper alloy sample is a brass standard substance containing manganese and chromium (the standard value of chromium content is 0.21%).

[0091] (1) draw standard solution working curve:

[0092] Weigh five portions of 0.200g pure copper with an electronic balance and place them in a group of five 250mL conical flasks, pipette 0mL, 5mL, 10mL 10ug / mL chromium standard solution with 100- Pipette 0.5mL and 1.0mL 1000ug / mL chromium standard solution into conical flasks with a 1000ul adjustable volume pipette, then add 10mL nitric acid solution and 15mL sulfur-phosphorus mixed acid with a 2...

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Abstract

The invention discloses a method for detecting the content of chromium in copper alloy. The method comprises the following steps: 1, dissolving: weighing a certain mass of a copper alloy sample, and adding a nitric acid sample to dissolve the copper alloy sample; 2, completely dissolving: adding the processed copper alloy sample obtained in step 1 to a sulfur-phosphorus mixture acid containing analytically pure sulfuric acid and analytically pure phosphoric acid to completely dissolve the copper alloy sample in order to obtain a clarified solution; 3, reaching a constant volume: transferring the clarified solution obtained in step 2 to a volumetric flask, and allowing the volume of the clarified solution to reach a constant volume in order to obtain a solution to be detected; and 4, detecting and analyzing: detecting the content of chromium in the solution to be detected through an inductively coupled plasma atomic emission spectrometer. The nitric acid solution and the sulfur-phosphorus mixture acid are used to process the copper alloy sample in order to completely dissolve the sample, so the method has the advantages of substantial improvement of the accuracy of a detection result, small error and high applicability.

Description

technical field [0001] The invention relates to the technical field of detection and analysis of heavy metal element content, in particular to a detection method of chromium content in copper alloy. Background technique [0002] Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES) is an atomic emission spectrometry analysis method in which plasma is used as the excitation light source, and it can simultaneously determine multiple elements. It can conveniently, quickly and accurately determine various metal elements and metalloid elements in samples without significant matrix effect. [0003] At present, when using inductively coupled plasma atomic emission spectrometry to detect the content of heavy metal elements, for copper alloy samples containing chromium, it is generally used to dissolve copper alloy samples by adding nitric acid and perchloric acid and evaporating until perchloric acid fumes are emitted, but for some For copper alloy materials containing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N1/38G01N1/44
CPCG01N21/73G01N1/38G01N1/44
Inventor 易晓凡唐小红
Owner 武汉泛洲中越合金有限公司
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