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Method for testing tin content of tin-lead solder through flame atomic absorption spectroscopy method

A technology of flame atomic absorption and tin-lead solder, which is applied in the field of chemical analysis, can solve the problems of high operational proficiency, complex test process, and large amount of reagents, and achieve simple operation, less acid consumption, and high accuracy. Effect

Inactive Publication Date: 2014-02-19
ANHUI WAYEE SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above two methods have many experimental steps, the test process is complicated, the amount of reagents is large, and the requirements for the operator's proficiency are relatively high.

Method used

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  • Method for testing tin content of tin-lead solder through flame atomic absorption spectroscopy method
  • Method for testing tin content of tin-lead solder through flame atomic absorption spectroscopy method
  • Method for testing tin content of tin-lead solder through flame atomic absorption spectroscopy method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: the pretreatment method of sample:

[0015] 1. Take the middle part of tin-lead solder with the brand name S-Sn50PbA, cut it into 0.5cm section with medical scissors, and weigh 0.4850g accurately;

[0016] 2. Put the weighed sample into a 250mL polytetrafluoro beaker, add 1mL nitric acid, 2mL hydrofluoric acid, 1mL hydrogen peroxide, place it on the electric heating plate and heat it to a slight boil at a low temperature. After the sample is completely dissolved, turn off the electric heating plate , use the residual heat of the electric heating plate to drive away the acid, stop the acid drive when the remaining 1ml of the digestion solution is left, cool to room temperature, transfer to a 50mL polyethylene volumetric flask, rinse the Teflon beaker with deionized water, and merge the rinse solution into the volumetric flask, Constant volume; use the same treatment method to make sample blank.

Embodiment 2

[0017] Embodiment 2: concrete experimental test of the present invention:

[0018] 1.1 Instruments and equipment

[0019] WYS2200 atomic absorption spectrometer (Anhui Wanyi Technology), adjustable electric heating plate, WY802-II ultrapure water machine (Anhui Wanyi Technology), tin hollow cathode lamp (Beijing General Institute of Nonferrous Metals)

[0020] 1.2 Reagents and solutions

[0021] (1) Nitric acid: superior grade, 68%, Sinopharm reagent; (2) Hydrofluoric acid: superior grade, Sinopharm reagent; (3) Hydrogen peroxide, superior grade, 30%, Sinopharm reagent; (4) High purity Ionized water, resistivity ≥ 18MΩ.cm; (5) Tin standard solution: 1000μg / mL, Beijing General Institute of Nonferrous Metals; (6) Lead-tin alloy reference material GSB04-1330-60A: National Center for Standard Materials; (7) Tin Lead solder standard samples YTR8801 (30), YTR8805 (90): National Center for Standard Materials.

[0022] 1.3 Preparation of standard solution

[0023] Take 4 polyethyl...

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Abstract

The invention discloses a method for testing tin content of a tin-lead solder through a flame atomic absorption spectroscopy method. According to the method, nitric acid, hydrofluoric acid and hydrogen peroxide are used as solvents to rapidly decompose the tin-lead solder, the ratio of the nitric acid to the hydrofluoric acid to the hydrogen peroxide is 1:2:1, a sample is heated and dissolved by an electric heating plate at the low temperature, the absorbancy of the tin in a decomposition solution is measured by using the air-acetylene fuel-lean flame atomic absorption spectroscopy method, and the tin content in the decomposition solution is calculated by using a standard addition method. The method is high in testing accuracy and relatively small in error, the whole analysis test process is simple in operation, the amount of acid used is small, and the method is capable of rapidly analyzing the tin content of the tin-lead solder.

Description

technical field [0001] The invention relates to a chemical analysis method, in particular to a method for testing tin content in tin-lead solder by flame atomic absorption method. Background technique [0002] Sn-lead solder is an important soldering material for microelectronics and radio assembly. The tin content in it directly affects the performance of the soldered product. Therefore, it is necessary to know the tin content in the solder accurately. The national standard GB10574.1-89 stipulates that the chemical analysis method of tin-lead solder adopts the potassium iodate titration method. The sample needs to be decomposed with sulfuric acid and potassium bisulfate. In hydrochloric acid solution, use iron powder and aluminum flakes to reduce tetravalent tin to divalent tin, use starch as indicator, and titrate with potassium iodate standard titration solution. The national standard GB / T4103.1-2000 stipulates the chemical analysis method for lead and lead alloys, usin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 曹文质王国东高美丽周宇
Owner ANHUI WAYEE SCI & TECH CO LTD
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