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GB/T 39138.1-2020: Methods for chemical analysis of gold nickel chromium iron silicon boron alloys - Part 1: Determination of gold content - Potentiometric titration using ferrous sulfate
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Methods for chemical analysis of gold nickel chromium iron silicon boron alloys - Part 1: Determination of gold content - Potentiometric titration using ferrous sulfate
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GB/T 39138.1-2020
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Basic data | Standard ID | GB/T 39138.1-2020 (GB/T39138.1-2020) | | Description (Translated English) | Methods for chemical analysis of gold nickel chromium iron silicon boron alloys - Part 1: Determination of gold content - Potentiometric titration using ferrous sulfate | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H15 | | Classification of International Standard | 77.120.99 | | Word Count Estimation | 6,641 | | Date of Issue | 2020-10-11 | | Date of Implementation | 2021-09-01 | | Regulation (derived from) | National Standard Announcement No. 21 of 2020 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39138.1-2020: Methods for chemical analysis of gold nickel chromium iron silicon boron alloys - Part 1: Determination of gold content - Potentiometric titration using ferrous sulfate
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Methods for chemical analysis of gold nickel chromium iron silicon boron alloys - Part 1.Determination of gold content - Potentiometric titration using ferrous sulfate
ICS 77.120.99
H15
National Standards of People's Republic of China
Chemical analysis method of gold-nickel-chromium-iron-silicon-boron alloy
Part 1.Determination of gold content
Potentiometric titration of ferrous sulfate
2020-10-11 released
2021-09-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Foreword
GB/T 39138 "Methods for chemical analysis of gold-nickel-chromium-iron-silicon-boron alloys" is divided into 3 parts.
---Part 1.Determination of gold content by ferrous sulfate potentiometric titration;
---Part 2.Determination of nickel content by the diacetyl oxime gravimetric method;
---Part 3.Determination of chromium, iron, silicon, boron content inductively coupled plasma atomic emission spectrometry.
This part is Part 1 of GB/T 39138.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part was proposed by China Nonferrous Metals Industry Association.
This part is under the jurisdiction of the National Nonferrous Metals Standardization Technical Committee (SAC/TC243).
Drafting organizations of this section. Guiyan Platinum Industry Co., Ltd., Xi'an Hantang Analysis and Testing Co., Ltd., Guiyan Testing Technology (Yunnan) Co., Ltd.
Company, Jiangxi Han's Precious Metals Co., Ltd., National Standard (Beijing) Inspection and Certification Co., Ltd., Zijin Mining Group Co., Ltd., Changchun Huang
Golden Research Institute Co., Ltd., Guangdong Industrial Analysis and Testing Center.
The main drafters of this section. Jin Yaqiu, Zeng Hefeng, Chen Dengquan, Teng Long, Gan Jianzhuang, Fu Shimei, Yang Pingping, Liu Leilei, Sun Baolian, Yu Fengshan,
Chen Xiongfei, Tian Jia, Huang Fuying, Yu Jinsheng, Chen Yonghong, Su Guangdong, Chen Xiaolan.
Chemical analysis method of gold-nickel-chromium-iron-silicon-boron alloy
Part 1.Determination of gold content
Potentiometric titration of ferrous sulfate
1 Scope
This part of GB/T 39138 specifies the method for determination of gold content in gold-nickel-chromium-iron-silicon-boron alloys.
This section applies to the determination of gold content in gold-nickel-chromium-iron-silicon-boron alloys. Measuring range. 15.00%~30.00%.
2 Method principle
The sample is dissolved in hydrochloric acid and nitric acid, and in the medium of sulfuric acid and phosphoric acid, the standard titration solution of ferrous sulfate is used to titrate Au(Ⅲ) to Au(0).
The position method indicates the end point to calculate the quality score of gold.
3 reagent
Unless otherwise specified, only use reagents and distilled or deionized water or equivalent purity water confirmed to be analytically pure in the analysis.
3.1 Hydrochloric acid (ρ=1.19g/mL).
3.2 Nitric acid (ρ=1.42g/mL).
3.3 Sulfuric acid (ρ=1.84g/mL).
3.4 Phosphoric acid (ρ=1.70g/mL).
3.5 Sulfuric acid and phosphoric acid mixed acid. Take 50mL phosphoric acid (3.4) in a 300mL beaker, and slowly add 50mL sulfuric acid (3.3) while stirring.
Mix well, cool, and transfer to reagent bottle for later use.
3.6 Sulfuric acid solution (4 96).
3.7 Sodium chloride solution (250g/L).
3.8 Standard titration solution of ferrous sulfate (0.008mol/L).
a) Preparation. Weigh 10.5g of ferrous sulfate (FeSO4·7H2O) solid and dissolve it in a brown containing 5000mL sulfuric acid solution (3.6)
Mix well in a glass bottle and place it for calibration for more than 7 days.
b) Calibration. Calibration is performed in parallel with the measurement of the sample.
Pipette 10.00mL gold standard solution (3.9) into a 100mL beaker, add 0.5mL sodium chloride solution (3.7), and steam until wet in a water bath
Salty, remove. Add 5mL sulfuric acid and phosphoric acid mixed acid (3.5), add water to 40mL volume. Insert the platinum indicator electrode and
Saturated potassium chloride calomel reference electrode, under electromagnetic stirring, titrate with ferrous sulfate standard titration solution (3.8a)) to near the end point (that is, the potential sudden change)
When the jump value changes greatly), use a microburette to titrate to the potential jump point as the end point.
Three parts are calibrated in parallel, and the range of the volume of the ferrous sulfate standard titration solution consumed should not exceed 0.020mL, whichever is the average.
Calculate the actual concentration of ferrous sulfate standard titration solution according to formula (1).
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