YS/T 1120.2-2016 English PDF

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YS/T 1120.2-2016: Method for chemical analysis of gold-tin alloys--Part 2: Determination of tin content--Complexometric titration using fluoride releasing EDTA
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
YS/T 1120.2-2016	139	Add to Cart	3 days	Method for chemical analysis of gold-tin alloys--Part 2: Determination of tin content--Complexometric titration using fluoride releasing EDTA	Valid

Similar standards

GB/T 17472   GB/T 17473.2   GB/T 17473.1   YS/T 1120.3   YS/T 1105   YS/T 1120.1   

Basic data

Standard ID: YS/T 1120.2-2016 (YS/T1120.2-2016)
Description (Translated English): Method for chemical analysis of gold-tin alloys--Part 2: Determination of tin content--Complexometric titration using fluoride releasing EDTA
Sector / Industry: Nonferrous Metallurgy Industry Standard (Recommended)
Classification of Chinese Standard: H68
Word Count Estimation: 6,670
Date of Issue: 2016-07-11
Date of Implementation: 2017-01-01
Regulation (derived from): Notice of the Ministry of Industry and Information Technology (2016 No. 37)
Issuing agency(ies): Ministry of Industry and Information Technology
Summary: This standard specifies the method for determining the amount of tin in gold-tin alloys.

YS/T 1120.2-2016: Method for chemical analysis of gold-tin alloys--Part 2: Determination of tin content--Complexometric titration using fluoride releasing EDTA

---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.
Method for chemical analysis of gold-tin alloys - Part 2. Determination of tin content - Complexometric titration using fluoride EX EDTA ICS 77.120.99 H68 People's Republic of China Nonferrous Metals Industry Standard Metallographic analysis of gold alloy Part 2. determination of tin content Fluoride precipitation EDTA complexometric titration method Part 2. Determinationoftincontent- 2016-07-11 released 2017-01-01 Implementation Issued by the Ministry of Industry and Information Technology of the People's Republic of China

Foreword

YS/T 1120 "gold and tin alloy chemical analysis method" is divided into the following three parts. - Part 1. Determination of gold quantity - Fire test method; - Part 2. Determination of tin content - Fluoride precipitation EDTA complexometric titration; Part 3. Determination of iron, copper, silver, lead, palladium, cadmium and zinc - Inductively coupled plasma - atomic emission spectrometry. This part is part 2 of the YS/T 1120 Metallurgical Chemical Analysis Method. This part is drafted in accordance with the rules given in GB/T 1.1-2009. This part of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243) proposed and centralized. This part of the main drafting unit. your research and testing technology (Yunnan) Co., Ltd., your research Platinum Co., Ltd., China Nonferrous Metals Industry Standard Measurement Quality Institute. This part participates in the drafting unit. Guangzhou Nonferrous Metals Research Institute, Beijing Nonferrous Metals and Rare Earth Application Research Institute, Tongling Nonferrous Metals Branch, Zijin Mining Group Co., Ltd. The main drafters of this part. Jin Yaqiu, Zeng Hefeng, Xiang Lei, Gan Jianzhuang, Xing Yinjuan, Fu Shimei, Wang Teng, Xu Kun, Zhu Wuxun, Zhao Wenhu, Liang Jie, Chen Xiaolan, Xu Siting, Zhang Juan, Zhi Fuguo, Gong Changhe, Chen Yan, Wu Wenxia, Ye Jinnian, Long Xiujia. Metallographic analysis of gold alloy Part 2. determination of tin content Fluoride precipitation EDTA complexometric titration method

1 Scope

This part of YS/T 1120 specifies the method for the determination of tin content in gold and tin alloys. This part is applicable to the determination of tin content in tin alloy. The measurement range is 15% to 95%.

2 method summary

The sample was dissolved with a mixed acid of hydrochloric acid and nitric acid, and gold was reduced with sulfurous acid. In acidic media, add excess EDTA to tin complex. To six Methyltetramine as a buffer, xylenol orange as an indicator, at pH5.8 with zinc standard titration solution back titration. Ammonium fluoride and precipitation Combined with EDTA, and then titrated with zinc standard titration to determine the amount of tin.

3 reagent

Unless otherwise stated, only the reagents identified as analytical reagents and primary water with a resistivity of no more than 18.2 MΩ · cm-1 were used in the analysis. 3.1 six methyltetraamine. 3.2 Ammonium fluoride. 3.3 disodium ethylenediamine tetraacetate. 3.4 Liuhe water zinc nitrate. 3.5 xylenol orange. 3.6 Hydrochloric acid (ρ1.19g/mL). 3.7 nitric acid (ρ1.42g/mL). 3.8 Sulfite (ρ1.03g/mL). 3.9 Hydrochloric acid (1 1). 3.10 hydrochloric acid (1 4). 3.11 hydrochloric acid (2 98). 3.12 Mixed acid. 4 units of hydrochloric acid (3.6) is mixed with 1 unit volume of nitric acid (3.7). When used with the current allocation. 3.13 Ethylenediamine tetraacetic acid disodium [Na2EDTA 2H2O (abbreviated as EDTA)] solution (0.026 mol/L). Weigh 19.36 g of ethyl Ammonium tetraacetic acid disodium (3.3), in 250mL beaker, add.200mL water dissolved, into the.2000mL volumetric flask, diluted with water Degree, mix. 3.14 Ammonium fluoride solution (100g/L). Weigh 10.0g ammonium fluoride (3.2), in 250mL plastic beaker, add 100mL water dissolved, Mix well. 3.15 tin standard solution. Weigh 1.00g metal tin (mass fraction of not less than 99.99%), accurate to 0.0001g, placed in 250mL burn Cup, add 50mL hydrochloric acid (3.6), cover the surface of the dish, low temperature heating to complete dissolution. After cooling, rinse the surface dish with hydrochloric acid (3.10) The beaker wall was transferred to a 1000 mL volumetric flask containing about 500 mL of hydrochloric acid (3.10) and diluted with hydrochloric acid (3.10) to the graduated volume. this Solution 1mL containing 1mg tin. ......

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