Method for determination of tin content in tin-lead solder by complexometric titration method

A technology of tin-lead solder and complexometric titration, which is applied in the direction of chemical analysis by titration, can solve the problems of unguaranteed sealing performance and repeatability, cumbersome operation, and difficulty in mastering, so as to improve detection efficiency, accuracy, and operation easy effect

Inactive Publication Date: 2015-04-15
JIANGXI HONGDU AVIATION IND GRP
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Problems solved by technology

[0002] Sn-lead solder is widely used in the production and life of military and civilian products, and the determination of the main content element tin, the national standard usually used is GB10574.1 "Determination of tin content by chemical

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  • Method for determination of tin content in tin-lead solder by complexometric titration method

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[0021] Example: A method for determining the amount of tin in tin-lead solder by complexometric titration, the steps are as follows:

[0022] 1. Sample weight: Weigh a total of five groups of 30 samples according to the range specified in Table 1 for measurement.

[0023] Tin content,% Weigh the sample size, g 15~600.2000 > 60~96 0.1000

[0024] 2. Determination:

[0025] 1) Place the sample in a 250 ml triangular beaker.

[0026] 2) Add 8ml of hydrochloric acid, 1~2ml of nitric acid, and heat to dissolve at a low temperature. When there are many small bubbles appearing at the beginning of the reaction, remove the triangular beaker. When the reaction slows down, place the triangular beaker at the low temperature of the electric furnace to continue dissolving . If white particles appear in the solution (samples with high lead content will appear), crush the white particles with a glass rod, continue to heat and steam to about 5ml or when salt appears (samples with high lead content...

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Abstract

The invention relates to the field of tin-lead solder detection, and in particular relates to a method for the determination of tin content in tin-lead solder by complexometric titration method. The steps are as follows: a tin-lead solder specimen is weighed and placed in a triangular beaker; 8ml hydrochloric acid and 1-2ml nitric acid are added, the tin-lead solder specimen is heated and dissolved at low temperature, EDTA and water are added, the triangular beaker is placed on an electric furnace for heating to boil for 1 to 2 minutes to dissolve salts, the triangular beaker is taken down and cooled to room temperature; extensive ph indicator paper is added, hexamethylenetetramine solution is added for about six times until the extensive ph indicator paper just turns yellow, then excess 5 ml of the hexamethylenetetramine solution is added, two drops of xylenol orange indicator is added, a zinc standard solution is added for titration until the solution just turns red and does not fade; solid sodium trifluoride is added, the solution is shaken evenly and stood still for 5 minutes; and the zinc standard solution is added for titration until the solution just turns red and does not fade to reach the terminal point; the tin percent content can be calculated by the result analysis, the method for the determination of tin content in tin-lead solder by complexometric titration method is simple in operation, a tin reduction device is not needed, and the detection efficiency and accuracy can be improved.

Description

technical field [0001] The invention relates to the field of tin-lead solder detection, in particular to a method for measuring tin content in tin-lead solder by complexometric titration. Background technique [0002] Sn-lead solder is widely used in the production and life of military and civilian products, and the determination of the main content element tin, the national standard usually used is GB10574.1 "Determination of tin content by chemical analysis method of tin-lead solder", which is cumbersome to operate and difficult to master. In the process of operation, it is necessary to build a tin reduction device by itself, and the sealing performance and repeatability cannot be guaranteed. Contents of the invention [0003] The object of the present invention is to solve the problems referred to above, and a kind of complexometric titration method is provided to measure the method for the amount of tin in tin-lead solder. [0004] In order to realize the purpose of t...

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Application Information

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IPC IPC(8): G01N31/16
Inventor 周琳燕
Owner JIANGXI HONGDU AVIATION IND GRP
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