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GB/T 4698.19-2017: Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 19: Determination of molybdenum content -- Thiocyanate-differential spectrophotometry
Status: Valid GB/T 4698.19: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 4698.19-2017 | English | 119 |
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Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 19: Determination of molybdenum content -- Thiocyanate-differential spectrophotometry
| Valid |
GB/T 4698.19-2017
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| GB/T 4698.19-1996 | English | 159 |
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Sponge titanium, titanium and titanium alloys. Determination of magnesium content. Thiocyanate differential spectrometric method
| Obsolete |
GB/T 4698.19-1996
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PDF similar to GB/T 4698.19-2017
Basic data | Standard ID | GB/T 4698.19-2017 (GB/T4698.19-2017) | | Description (Translated English) | Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 19: Determination of molybdenum content -- Thiocyanate-differential spectrophotometry | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H14 | | Classification of International Standard | 77.120.50 | | Word Count Estimation | 6,614 | | Date of Issue | 2017-09-29 | | Date of Implementation | 2018-04-01 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GB/T 4698.19-2017: Methods for chemical analysis of titanium sponge, titanium and titanium alloys -- Part 19: Determination of molybdenum content -- Thiocyanate-differential spectrophotometry
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Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 19. Determination of molybdenum content - Thiocyanate-differential spectrophotometry
ICS 77.120.50
H14
National Standards of People's Republic of China
Replacing GB/T 4698.19-1996
Sponge titanium, titanium and titanium alloys - Methods for chemical analysis
Part 19. Determination of molybdenum content
Thiocyanate differential spectrophotometry
Methodsforchemicalanalysisoftitaniumsponge, titaniumand
titaniumaloys-Part 19.Determination of molybdenumcontent-
2017-09-29 Posted
2018-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Foreword
GB/T 4698 "titanium sponge, titanium and titanium alloy chemical analysis method" is divided into the following sections.
--- Part 1. Determination of copper content by flame atomic absorption spectrometry;
--- Part 2. Determination of iron content;
--- Part 3. Determination of silicon content molybdenum blue spectrophotometry;
--- Part 4. Determination of manganese content Periodate spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 5. Determination of molybdenum content thiocyanate spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 6. Determination of boron content Methylene blue spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 7. Determination of oxygen content, nitrogen content;
--- Part 8. Determination of aluminum content Alkaline separation - EDTA complexometric titration and inductively coupled plasma atomic emission spectrometry;
--- Part 9. Determination of tin content potassium iodate titration and inductively coupled plasma atomic emission spectrometry;
--- Part 10. Determination of chromium content Ferrous ammonium sulfate titration and inductively coupled plasma atomic emission spectrometry (including vanadium);
--- Part 11. Determination of chromium content ferrous ammonium sulfate titration (excluding vanadium);
--- Part 12. Determination of vanadium content ammonium ferrous sulfate titration and inductively coupled plasma atomic emission spectrometry;
--- Part 13. Determination of zirconium content EDTA complexometric titration and inductively coupled plasma atomic emission spectrometry;
--- Part 14. Determination of carbon content;
--- Part 15. Determination of hydrogen content;
--- Part 17. Determination of magnesium content by flame atomic absorption spectrometry;
--- Part 18. Determination of tin content by flame atomic absorption spectrometry;
--- Part 19. Determination of molybdenum content; Thiocyanate spectrophotometric method;
--- Part 21. Determination of manganese, chromium, nickel, aluminum, molybdenum, tin, vanadium, yttrium, copper and zirconium content; Atomic emission spectrometry;
--- Part 22. Determination of niobium content 5-Br-PADAP spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 23. Determination of palladium content Stannous chloride - potassium iodide spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 24. Determination of nickel content dimethylglyoxime spectrophotometry and inductively coupled plasma atomic emission spectrometry;
--- Part 25. Determination of chlorine content of silver chloride spectrophotometry;
--- Part 26. Determination of tantalum content and tungsten content; Inductively coupled plasma atomic emission spectrometry;
--- Part 27. Determination of neodymium content by inductively coupled plasma atomic emission spectrometry;
--- Part 28. Determination of ruthenium content Inductively coupled plasma atomic emission spectrometry.
This section GB/T 4698 Part 19.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This Part Replaces GB/T 4698.19-1996 "Titanium, titanium and titanium alloys - Determination of thiocyanate by differential spectrophotometry
Molybdenum content. "
This section compared with GB/T 4698.19-1996 main changes are as follows.
--- Increase "14.00% ~ 16.00%" of the measurement range (see Chapter 1);
--- Removed the "reference standard" (1996 edition of Chapter 2);
--- Increase the sample terms (see Chapter 5)
--- Increased precision terms (see Chapter 8,.1996 edition Chapter 8);
--- Added test report terms (see Chapter 9).
This part is proposed by China Nonferrous Metal Industry Association.
This part of the National Non-ferrous Metal Standardization Technical Committee (SAC/TC243) centralized.
This part of the drafting unit. Northwest Nonferrous Metal Research Institute, Western Metal Materials Co., Ltd., Jinduicheng Molybdenum Co., Ltd.,
Standard (Beijing) Inspection and Certification Co., Ltd., Shenyang Nonferrous Metal Processing Co., Ltd., Zunyi Titanium Industry Co., Ltd., Guangdong Industrial
Analysis Center, Zun Bao Titanium Co., Ltd.
The main drafters of this section. Sun Baolian, Wang Jinlei, Rowling, Zhang Danli, Li Bo, Li Haiyan, Xie Mingming, Liu Houyong, Lei Rui, Li Tian, Tong Ling,
Wang Li, Sun Aiping, Wang Xin, Qin Junrong, Zhang Jinjie, Huang Puying, Xiong Xiaoyan, Yang Zaijiang, Yang Xuexin.
This part replaces the standards previously issued.
--- GB/T 4698.19-1996.
Sponge titanium, titanium and titanium alloys - Methods for chemical analysis
Part 19. Determination of molybdenum content
Thiocyanate differential spectrophotometry
1 Scope
GB/T 4698 provisions of this part of the determination of molybdenum content of titanium.
This section applies to the determination of molybdenum content in titanium alloys. Measurement range. 14.00% ~ 16.00%, 30.00% ~ 34.00%.
2 method summary
Sample with sulfuric acid - nitric acid dissolved. In sulfuric acid medium, molybdenum (Ⅵ) is reduced to molybdenum (Ⅴ) by thiourea using copper (Ⅱ) as catalyst,
And thiocyanate generated orange red complex, in the spectrophotometer wavelength 460nm at the differential method to measure the absorbance.
3 reagent
Unless otherwise stated, only reagents identified as analytical grade and laboratory grade II water were used in the analysis.
3.1 Nitric acid (p = 1.42 g/mL).
Hydrofluoric acid (p = 1.13 g/mL).
3.3 Sulfuric acid (1 1).
3.4 Titanium titanium (wTi ≧ 99.95%, wMo < 0.001%).
3.5 Potassium thiocyanate solution (500 g/L).
3.6 Copper sulfate solution (20g/L).
3.7 Thiourea solution (100 g/L).
3.8 Molybdenum standard stock solution Weigh 0.5000g metal molybdenum (wMo ≥ 99.95%), placed in 400mL beaker, add 50mL sulfuric acid
(3.3). Nitric acid (3.1) is added dropwise under heating to dissolve completely. Heating is continued until the sulfuric acid rich white smoke is taken off and cooled down. Add 50mL water,
Heat to dissolve salt, cooled to room temperature, transferred to 500mL volumetric flask, diluted with water to the mark, mix well. This solution contains 1mL
1 mg molybdenum.
3.9 Molybdenum standard solution Pipette 10.00mL molybdenum standard stock solution (3.8) into 100mL volumetric flask, diluted with water to the mark, mix well.
This solution 1 mL contains 100 μg molybdenum.
4 instruments
Spectrophotometer.
5 sample
In accordance with the promulgated sponge titanium, titanium and titanium alloy take sample preparation standards.
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