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Analysis method for determining copper in tin-silver-copper solder through iodometry

An analytical method, tin-silver-copper technology, applied in the analysis by chemical reaction of the material, the material analysis by observing the effect on the chemical indicator, the preparation of the test sample, etc., can solve the distortion, affect the result accurately and Authenticity, solution splashing, etc., to achieve the effect of easy operation, shortening detection time, and improving accuracy

Inactive Publication Date: 2015-07-01
BEIJING INST OF NONFERROUS METALS & RARE EARTH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Improper selection will cause the solution to splash and cause distortion, affecting the accuracy and authenticity of the results

Method used

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  • Analysis method for determining copper in tin-silver-copper solder through iodometry
  • Analysis method for determining copper in tin-silver-copper solder through iodometry
  • Analysis method for determining copper in tin-silver-copper solder through iodometry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] In this example, tin 50 silver 42 copper 8 For example, to measure the content of copper wherein, the specific determination method steps are as follows:

[0042] 1. Standard substance analysis

[0043] 1) Weigh the standard substance

[0044] Weigh the standard substance pure copper which is similar to the copper content in the sample, and its purity and weight are as follows:

[0045] Table 1

[0046] Standard substance name

Copper content (%)

Sample weight (g)

pure copper

99.99

0.4016

pure copper

99.99

0.4046

[0047] 2) Dissolution of standard substances

[0048] Put the weighed standard substance in a 250ml beaker, add 10ml of concentrated nitric acid, cover with a watch glass, heat to 80-100°C to dissolve the sample, continue to heat to 600°C to drive out nitrogen oxides, and cool. Transfer to a 200ml volumetric flask, make up to the mark with deionized water, and shake well;

[0049] 3) Fractionation a...

Embodiment 2

[0074] In this example, tin 30 silver 30 copper 40 For example, to measure the content of copper wherein, the specific determination method steps are as follows:

[0075] 1. Standard substance analysis

[0076] The same method as in Example 1 was adopted to obtain the titer of sodium copper thiosulfate.

[0077] 2. Sample analysis

[0078] 1) Weigh about 0.5000g tin 30 silver 30 copper 40 Sample, accurate to 0.0001g.

[0079] 2) Dissolution of the sample

[0080] Put the sample in a 250ml beaker bottle, add 10ml of concentrated sulfuric acid and heat to dissolve, take it down and cool to room temperature, add 30ml of perchloric acid, after the sample is completely dissolved, heat until white smoke of perchloric acid is emitted, divide 20 times Add 50ml of concentrated hydrochloric acid to remove tin until the solution turns from turbid to clear; Concentrate the solution to 5ml, remove it and cool it to room temperature, add 40ml of deionized water, shake well, so as t...

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PUM

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Abstract

The invention discloses an analysis method for determining copper in a tin-silver-copper solder through iodometry. The method comprises the steps of weighing a unit of a sample and putting into a 250 ml conical flask, adding a proper amount of concentrated sulfuric acid, heating, dissolving the sample, taking down the conical flask, cooling to room temperature, adding a proper amount of perchloric acid, heating till a perchloric acid white smoke is emitted after the sample is completely dissolved, dropwise adding hydrochloric acid for a plurality of times to remove tin, concentrating the solution to a small volume, taking down the flask, cooling to the room temperature, and shaking uniformly. Adding a proper amount of ammonium hydroxide solution into the sample to form a solution which is complex copper ammine ion blue, adding a proper amount of ammonium bifluoride, shaking till the blue disappears, cooling the flask to the room temperature with a cold water flow, standing for 30 seconds, adding a proper amount of potassium iodide, titrating with a sodium thiosulfate standard solution immediately to light yellow, adding a proper amount of potassium rhodanide and a starch solution, titrating continuously with the sodium thiosulfate standard solution till the blue disappears, and recording the milliliter quantity.

Description

technical field [0001] The invention relates to an analysis method for measuring copper in tin-silver-copper solder by iodometric method, belonging to the technical field of alloy component analysis. Background technique [0002] With the development of analysis and testing technology at home and abroad, various testing companies have correspondingly improved the analysis and testing level of their products in order to adapt to the fierce competition in the market. At present, the analysis method of silver-copper solder in my country is carried out according to the standard JS / T11020-1996. However, it does not apply to analytical methods containing tin. The analysis method of silver-copper-tin solder is carried out according to the national standard YB946 (Ag-11)-78, but it is only to measure the combined amount of copper and tin, and the amount of copper cannot be directly measured. And tin itself also has some interference on the determination of copper content. [0003]...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N1/34
Inventor 范树辉郅富国王炜许海燕
Owner BEIJING INST OF NONFERROUS METALS & RARE EARTH
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