GB/T 4698.19-2017Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 19: Determination of molybdenum content - Thiocyanate-differential spectrophotometry (English PDF)
海绵钛、钛及钛合金化学分析方法 第19部分：钼量的测定 硫氰酸盐示差光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 29, 2017
Implementation date
April 1, 2018
Scope
GB/T 4698.19-2017 is the English-translated version of 海绵钛、钛及钛合金化学分析方法 第19部分：钼量的测定 硫氰酸盐示差光度法.
GB/T 4698.19-2017 is the Chinese standard "Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 19: Determination of molybdenum content - Thiocyanate-differential spectrophotometry".
Its scope clause reads: 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%. Its clauses include method summary; reagent; instruments; sample.
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Document preview — GB/T 4698.19-2017
National Standard of the People's Republic of China
- ICS
- 77.120.50
- Classification
- H 14
- Replacing
- GB/T 4698.19-1996
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 method summary
- 3 reagent
- 4 instruments
- 5 sample
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 not less than 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.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
Editions of GB/T 4698.19
| Edition | Title | Revision | Status |
|---|---|---|---|
| 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 | current edition | Current |
| GB/T 4698.19-1996 | Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 19: Determination of molybdenum content - Thiocyanate-differential spectrophotometry | previous edition | Superseded |
This page sells the current edition, GB/T 4698.19-2017. Earlier editions are listed for reference only.
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Related Standards
GB/T 4698.21-2019 — Methods for chemical analysis of titanium sponge, titanium and titanium alloys—Part 21: Determination of manganese, chromium, nickel, aluminum, molybdenum, tin, vanadium, yttrium, copper and zirconium content—Atomic emission spectrometry
GB/T 4698.18-1996 — Sponge titanium, titanium and titanium alloys. Determination of magnesium content. Flame atomic absorption spectrometric method
GB/T 4698.21-1996 — Sponge titanium, titanium and titanium alloys. Determination of manganese, chromium, nickel, aluminum, molybdenum, tin, vanadium, yttrium, copper, zirconium content. Emission spectrographic method
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