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YS/T 938.3-2013: Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 3: Determination of silver content. Flame atomic absoption spectrometry and potentiometric titration
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Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 3: Determination of silver content. Flame atomic absoption spectrometry and potentiometric titration
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YS/T 938.3-2013
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Basic data | Standard ID | YS/T 938.3-2013 (YS/T938.3-2013) | | Description (Translated English) | Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 3: Determination of silver content. Flame atomic absoption spectrometry and potentiometric titration | | Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) | | Classification of Chinese Standard | H15 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 10,169 | | Regulation (derived from) | Ministry of Industry and Information Technology Bulletin No. 52, 2013; industry standard for filing Notice No. 1 of 2014 (No. 169 overall) | | Issuing agency(ies) | Ministry of Industry and Information Technology | | Summary | This standard specifies the method for the determination of dental porcelain repair base with gold and palladium-based alloys of silver. This standard applies to dental porcelain restoration and the use of silver-based alloys in the determination of gold- | YS/T 938.3-2013: Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 3: Determination of silver content. Flame atomic absoption spectrometry and potentiometric titration
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Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration Part 3. Determination of silver content Flame atomic absoption spectrometry and potentiometric titration
ICS 77.120.99
H15
People's Republic of China Nonferrous Metals Industry Standard
Porcelain dental restoration with gold-based alloys and palladium-based analysis
Part 3. Determination of silver content
Flame atomic absorption spectrometry and potentiometric titration
restoration-Part 3. Determinationofsilvercontent-Flameatomicabsoption
Issued on. 2013-10-17
2014-03-01 implementation
Ministry of Industry and Information Technology of the People's Republic of China released
Foreword
YS/T 938 "dental gold PFM group and palladium-based alloy chemical analysis method" is divided into four parts.
--- Part 1. determination of gold by weight of sodium nitrite reduction method;
--- Part 2. Determination of the amount of palladium dimethylglyoxime gravimetric method;
--- Part 3. Determination of the amount of silver by flame atomic absorption spectrometry and potentiometric titration;
--- Part 4. Inductively coupled plasma atomic gold, platinum, palladium, copper, tin, indium, zinc, gallium, beryllium, iron, manganese, lithium amount of emitted light
Spectroscopy.
This section YS/T 938 Part 3.
This section drafted in accordance with GB/T 1.1-2009 given rules.
The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.
This section is responsible for drafting unit. Beijing Nonferrous Metal Research Institute, China Nonferrous Metals Industry Institute of Standards and Metrology and Quality.
Participated in the drafting of this section. Guangzhou Nonferrous Metal Research Institute, Beijing General Research Institute of Mining and Metallurgy, China Nonferrous Guilin Research Institute of Geology mineral
Ltd., Fujian Zijin Mining and Metallurgy Testing Technology Co., Ltd., Xuzhou ho-new material Technology Co., Ltd.
The main drafters of this Part 1. Cai-Xia Chen, Li, Liu Fang, to Lei, Zhang Li, Wang Fang, Chen Xiaolan, Wang Haoying, Mary, Wang Jiang Liang, Liu hair,
Luo root, Xiexiang Na.
The main drafters of this section Method 2. Li Na, Liu Ying, Zhang Li, to Lei, Liu Bing, Chen Caixia, Yufeng Shan, Zhang Jin, Chen Xiaolan, Wang Haoying,
Mary.
Porcelain dental restoration with gold-based alloys and palladium-based analysis
Part 3. Determination of silver content
Flame atomic absorption spectrometry and potentiometric titration
1 1 flame atomic absorption spectrometry
1.1 Scope
This section YS/T 938 provides for dental porcelain repair method for the determination of gold, silver and base of palladium-based alloys.
This section applies to dental porcelain restoration with gold and palladium-based silver-based alloy was measured. Measurement range. 0.10 to 5.00%.
1.2 Method summary
Mixing the sample with hydrochloric acid, nitric acid dissolved. In hydrochloric acid medium volume fraction greater than 25%, the use of air - acetylene flame atomic absorption
On a take-spectrometer, the absorbance was measured at selected silver optimum working conditions.
1.3 Reagents and materials
Unless otherwise specified, the reagents were analytical reagent solution preparation and analysis are secondary distilled water or equivalent purity test
Room with water.
1.3.1 hydrochloric acid (ρ = 1.19g/mL).
1.3.2 nitric acid (ρ = 1.42g/mL).
1.3.3 mixed acid. hydrochloric acid (1.3.1) and nitrate (1.3.2) in a volume ratio 40︰7 mixed preparation.
1.3.4 nitric acid (11).
1.3.5 hydrochloric acid (13).
1.3.6 Silver standard stock solution. Weigh 0.1000g metallic silver (wAg≥99.99%), placed in 100mL beaker, add 10mL of nitric acid
(1.3.4), heated until completely dissolved, to make drive nitrogen oxides, cooling. The solution was transferred to 100mL volumetric flask, diluted with de-ionized water to chlorine
Volume, and mix. This solution 1mL containing 1000μg silver.
1.3.7 Silver standard solution. Pipette 10.00mL silver standard stock solution (1.3.6) in 100mL flask, add 10mL of nitric acid
(1.3.4), dilute with water to volume, and mix. This solution 1mL containing 100μg silver.
1.4 Instrument
Atomic absorption spectrometer, with a silver hollow-cathode lamp.
Under optimum working conditions for those who can reach the following indicators can be used.
--- Characteristic concentration. in the solution was measured and consistent substrate solution, wherein the concentration of silver is not more than 0.01μg/mL.
--- Precision. standard solution with the highest concentration of 11 times the absorbance measurements, the standard deviation should not exceed the average absorbance of 1.0%;
The lowest concentration of standard solution used (instead of "zero concentration" standard solution) 11 measuring the absorbance, which shall not exceed the maximum standard deviation
0.5% concentration of the standard average absorbance.
--- Linear curve. the curve according to concentration, is divided into five sections, the difference between the absorbance of the absorbance difference between the highest and the lowest segment of the segment
Ratio of not less than 0.7.
1.5 Sample
Sample (sheet) is processed into crushed particles with acetone to remove oil, washed with water, dried and mixed.
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