YS/T 938.1-2013 English PDF

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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
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
YS/T 938.1-2013	189	Add to Cart	3 days	Chemical analysis methods of gold alloys and palladium alloys for dental ceramic restoration. Part 1: Determination of gold content. Gravimetry by sodium nitrite reduction	Valid

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GB/T 17472   GB/T 17473.2   GB/T 17473.1   YS/T 938.3   YS/T 938.4   YS/T 938.2   

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

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
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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