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YS/T 938.1-2013: Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 1: Determination of gold content. Gravimetry by sodium nitrite reduction
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| YS/T 938.1-2013 | English | 189 |
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Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 1: Determination of gold content. Gravimetry by sodium nitrite reduction
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YS/T 938.1-2013
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Basic data | Standard ID | YS/T 938.1-2013 (YS/T938.1-2013) | | Description (Translated English) | Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 1: Determination of gold content. Gravimetry by sodium nitrite reduction | | Sector / Industry | Nonferrous Metallurgy Industry Standard (Recommended) | | Classification of Chinese Standard | H68 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 7,731 | | 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 porcelain dental restoration and the determination of the amount of the base alloy of gold with gold base. This standard applies to repair dental porcelain base with gold and palladium-based alloys of gold content determination | YS/T 938.1-2013: Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 1: Determination of gold content. Gravimetry by sodium nitrite reduction
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Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration Part 1. Determination of gold content Gravimetry by sodium nitrite reduction
ICS 77.120.99
H68
People's Republic of China Nonferrous Metals Industry Standard
Porcelain dental restoration with gold-based alloys and palladium-based analysis
Part 1. Determination of gold content
Sodium nitrite reduction gravimetric method
restoration-
Part 1. Determinationofgoldcontent-
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 1.
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. Xuzhou ho-new material Technology Co., Ltd., Beijing General Research Institute of Mining and Metallurgy, China Nonferrous minerals Guilin
Institute of Geological Ltd., Fujian Zijin Mining and Metallurgy Testing Technology Co., Ltd., Guangzhou Nonferrous Metal Research Institute.
The main drafters of this section. Liu Bing, Zang Muwen, Li Na, to Lei, Yang Hui, Yu Fengshan, Wang Haoying, Shi Yihua, summer pearls, Chen Xiaolan, Lan Mei E,
Mary, Shi Ping.
Porcelain dental restoration with gold-based alloys and palladium-based analysis
Part 1. Determination of gold content
Sodium nitrite reduction gravimetric method
1 Scope
This section YS/T 938 provides for dental porcelain repair method for measuring the amount of gold and gold-based palladium-based alloys.
This section applies to dental porcelain restoration with gold base and palladium based alloys in the gold content determination. Measurement range. 15.00% - 90.00%.
2 Method summary
Mixing the sample with hydrochloric acid, nitric acid dissolved. In addition after precipitation with silver chloride, silver in dilute hydrochloric acid solution with sodium nitrite reduction precipitation sponge
Gold, burning, constant weight, and inductively coupled plasma atomic emission spectrometer makeup gold remaining in the filtrate quality to precipitate gold and sponge
Filtrate quality of the residual gold and calculate the gold content.
3 Reagents
Unless otherwise specified, the reagents were analytical reagent solution preparation and analysis are secondary distilled water or equivalent purity test
Room with water.
3.1 hydrochloric acid (ρ = 1.19g/mL).
3.2 nitric acid (ρ = 1.42g/mL).
3.3 mixed acid. hydrochloric acid (3.1) and nitrate (3.2) in a volume ratio 40︰7 mixed preparation.
3.4 hydrochloride (199).
3.5 hydrochloride (11).
3.6 sodium nitrite solution (250g/L).
3.7 gold standard stock solution. Weigh 0.1000g Gold (wAu≥99.99%), placed in 100mL beaker, add 1mL of nitric acid (3.2) and
3mL hydrochloric acid (3.1), heated until completely dissolved and evaporated to near dryness, remove the coolish, adding 10mL hydrochloric acid (3.5), boiled to drive the best nitrogen oxide
Objects, remove the cooled and transferred to 100mL volumetric flask with water to volume, and mix. This solution 1mL containing 1000μg gold.
3.8 gold standard solution. Pipette 10.00mL gold standard stock solution (3.7), placed in 100mL flask, add 10mL hydrochloric acid
(3.5) with water to volume, and mix. This solution 1mL containing 100μg gold.
4 Instrument
Inductively coupled plasma atomic emission spectrometer.
--- Under optimum working conditions, with the gold standard solution 1.0μg/mL measured 11 times, and the relative standard deviation of light intensity does not
More than 2.5%;
--- Optimal wavelength alloying elements recommended for 267.575nm.
5 Sample
Sample (sheet) is processed into crushed particles with acetone to remove oil, washed with water, dried and mixed.
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