YS/T 746.3-2010Methods for chemical analysis of tin-based lead-free solders. Part 3: Determination of copper content. Flame atomic absorption spectrometric method and sodium thiosulfate titrimetric method (English PDF)

Foreword

YS/T 746 "non-Pb-based solder chemical analysis method" is divided into 17 parts.

--- Part 1 Determination of tin content Coke sexual gallic acid Covering - lead nitrate titration method

--- Part 2 of silver content - Flame atomic absorption spectrometry and potentiometric titration with potassium thiocyanate

--- Part 3 of copper content - Flame atomic absorption spectrometry and titration with sodium thiosulfate

--- Part 4 of lead content - Flame Atomic Absorption Spectrometry

--- Part 5 of bismuth content - Flame atomic absorption spectrometry and titration Na2EDTA

--- Part 6 of antimony content - Flame Atomic Absorption Spectrometry

--- Part 7 Determination of iron content by flame atomic absorption spectrometry

--- Part 8 of arsenic content of arsenic, antimony molybdenum blue spectrophotometric method

--- Part 9 Determination of zinc content by flame atomic absorption spectrometry and titration Na2EDTA Part 10 Determination of aluminum content --- first electrothermal atomic absorption spectrometry

--- Part 11 of cadmium content - Flame Atomic Absorption Spectrometry

--- Part 12 Determination of indium titration Na2EDTA

--- Part 13 Determination of nickel content by flame atomic absorption spectrometry

--- Part 14 Determination of the phosphorus content of the first crystal violet - heteropoly acid phosphovanadomolybdate spectrophotometry

--- Part 15 Determination of germanium content salicylfluorone spectrophotometry

--- Part 16 Determination of rare earth Arsenazo III spectrophotometry

--- Part 17 silver, copper, lead, bismuth, antimony, iron, arsenic, zinc, aluminum, cadmium, nickel, indium content was measured by inductively coupled plasma optical emission Spectroscopy this is Part 3.

This section is in accordance with GB/T 1.1-2009 given rules drafted.

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

This section is drafted. Yunnan Tin Group Co., Ltd.

Participated in the drafting of this section. Yunnan Hualian Zinc Co. indium.

1 Method, flame atomic absorption spectrometry

1 Scope

YS/T 746 This section provides lead-free tin-based solders Determination of copper content.

This section applies to the determination of tin-based solder without copper content. Measurement range. 0.010% to 1.000%.

2 Method summary

Samples with hydrochloric acid - nitric acid mixture decomposed in hydrochloric acid - nitric acid, mixed media, atomic absorption spectrometer at a wavelength of 324.7nm, with Flame atomizer, air - acetylene flame measured absorbance.

3 Reagents

Unless otherwise indicated in the analysis using only recognized as analytical grade reagents and distilled or deionized water or equivalent purity.

Nitrate 3.1 (rho1.42g/mL).

3.2 hydrochloride (rho1.19g/mL).

3.3 hydrochloric acid - nitric acid mixed. 300mL of hydrochloric acid (3.2) and 100mL nitric acid (3.1) and mixed.

3.4 Copper Standard stock solution. Weigh 0.5000g copper (>=99.99%), placed in 200mL beaker, was added 20mL of hydrochloric acid - nitric acid mixture Co acid (3.3), heat gently to dissolve completely, boil drive out nitrogen oxides, remove the cooled to room temperature and transferred to 1000mL volumetric flask, diluted with water to the mark, and mix. This solution 1mL containing 500µg copper.

3.5 Copper Standard Solution. Pipette 10.00mL copper standard stock solution (3.4) in 500mL volumetric flask, was added 5mL of hydrochloric acid - nitric acid mixture Co acid (3.3), dilute to the mark and mix. This solution 1mL containing 10µg copper.

4 Instrument

Atomic absorption spectrometer, with copper hollow cathode lamp.

Under optimum working conditions for those who can reach the following indicators can be used.

--- Characteristic concentration. a solution in the matrix is consistent with the measured solution, features copper concentration should be less than 0.035µg/mL;

--- Precision. measure 10 times the absorbance of the highest concentration of the standard solution, the standard deviation should not exceed the average absorbance of the concentration standard Standard solution (not "zero" concentration of the standard) measuring the absorbance of 10 times, the standard deviation should not exceed the maximum concentration of the standard level 0.5% average absorbance;

--- Linear curve. A standard curve is divided into five sections according to concentration, absorbance difference absorbance difference between the highest and the lowest segment of the segment Ratio of not less than 0.7.