GB/T 4698.17-2019 PDF English
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| GB/T 4698.17-2019 | English | 110 |
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Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 17: Determination of magnesium content - Flame atomic absorption spectrometry
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| GB/T 4698.17-1996 | English | 199 |
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Sponge titanium, titanium and titanium alloys. Determination of magnesium content. Flame atomic absorption spectrometric method
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GB/T 4698.17-2019: Methods for chemical analysis of titanium sponge, titanium and titanium alloys - Part 17: Determination of magnesium content - Flame atomic absorption spectrometry
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4698.17-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 77.120.50
H 14
Replacing GB/T 4698.17-1996
Methods for chemical analysis of titanium sponge,
titanium and titanium alloys -- Part 17: Determination
of magnesium content - Flame atomic absorption
spectrometry
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: MAY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Principle ... 6
4 Reagents ... 6
5 Equipment ... 7
6 Sample ... 8
7 Test steps ... 8
8 Test data processing ... 9
9 Precision ... 10
10 Test report ... 10
Foreword
GB/T 4698 “Methods for chemical analysis of titanium sponge, titanium and
titanium alloys” consists of the following parts:
-- Part 1: Determination of copper content - 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-Potassium 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 and nitrogen content;
-- Part 8: Determination of aluminum content - Separation with sodium
hydroxide-EDTA complex-metric 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 - Ammonium ferrous sulfate
titration and inductively coupled plasma atomic emission spectrometry
(with vanadium;
-- Part 11: Determination of chromium content in the absence of Vanadium -
Ammonium ferrous sulfate titration method;
-- 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 16: Determination of oxygen content - Inert gas fusion coulometric
method;
-- Part 17: Determination of magnesium content - Flame atomic absorption
spectrometry;
-- Part 18: Determination of tin content - Flame atomic absorption
spectrometry;
-- Part 19: Determination of molybdenum content - Thiocyanate-differential
spectrophotometry;
-- Part 20: Determination of manganese content - Potassium periodate
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 - Silver chlorin
spectrophotometry;
-- Part 26: Determination of alloying elements and impurity elements -
Inductively coupled plasma atomic emission spectrometry;
-- Part 27: Determination of neodymium content - Inductively coupled plasma
atomic emission spectrometry;
-- Part 28: Determination of ruthenium content - Inductively coupled plasma
atomic emission spectrometry;
-- Part 29: Determination of tungsten and tantalum - Inductively coupled
plasma atomic emission spectrometry.
Methods for chemical analysis of titanium sponge,
titanium and titanium alloys -- Part 17: Determination
of magnesium content - Flame atomic absorption
spectrometry
1 Scope
This Part specifies the determination method for magnesium content in titanium
sponge, titanium and titanium alloys.
This Part is applicable to the determination of magnesium content in titanium
sponge, titanium and titanium alloys. The determination range is
0.010%~1.00%.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 31981, Methods of sampling and sample preparation for chemical
composition analysis of titanium and titanium alloy
3 Principle
Use hydrochloric acid and hydrofluoric acid to dissolve test material. Use boric
acid complexes fluoride ions and strontium chloride as release agents. Use air-
acetylene flame, at a wavelength of 285.2nm of atomic absorption spectrometer,
to determine the magnesium content.
4 Reagents
Unless otherwise specified, the reagents used in this Part are analytical
reagents and laboratory grade two water.
4.1 Hydrochloric acid (ρ=1.19g/mL).
4.2 Nitric acid (ρ=1.42g/mL).
4.3 Hydrofluoric acid (ρ=1.15g/mL).
4.4 Hydrochloric acid (1+1).
4.5 Nitric acid (1+1).
4.6 Hydrofluoric acid (1+1).
4.7 Saturated boric acid solution.
4.8 Strontium chloride solution (60mg/mL): Weigh 50g of strontium chloride
(SrCl2 · 6H2O) in a 500mL beaker. Add 400mLof water to dissolve. Move into a
500mL volumetric flask. Use water to dilute to the scale. Shake well.
4.9 Magnesium standard storage solution: Weigh 0.1000g of metal magnesium
(wMg≥99.99%) in a 250mL beaker. Add 30mL of water and 10mLof hydrochloric
acid (4.4). Heat until they are completely dissolved. Cool to room temperature
and move into a 1000mL volumetric flask. Use water to dilute to the scale.
Shake well. 1mL of this solution contains 100μg of magnesium.
4.10 Magnesium standard solution: Move 10.00mLof magnesium standard
storage solution (4.9) in a 100mL volumetric flask. Add 2mL of hydrochloric acid
(4.4). Use water to dilute to the scale. Shake well. 1mL of this solution contains
10μg of magnesium.
5 Equipment
Atomic absorption spectrometer, with magnesium hollow cathode lamp.
Under the optimal working conditions of the instrument, anyone that can meet
the following indicators can be used:
-- Characteristic concentration: In a solution consistent with the
measurement solution matrix, the characteristic concentration of
magnesium shall not be greater than 0.02μg/mL;
-- Precision: Use the highest concentration standard solution to measure
absorbance 10 times. The standard deviation shall not exceed 1.0% of the
average absorbance. Use the lowest concentration standard solution (not
“zero” concentration standard solution) to measure absorbance 10 times.
The standard deviation shall not exceed 0.5% of the average absorbance
of the highest concentration;
-- Working curve linear: Divide the working curve into five segments by
concentration. The ratio of the absorbance difference between the highest
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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