GB/T 4698.10-2020 in English

VALID

Methods for chemical analysis of titanium sponge, titanium and titanium alloys—Part 10：Determination of chromium content—Ammonium ferrous sulfate titration and inductively coupled plasma atomic emission spectrometry（with vanadium）

Issued on:2020-03-06
Implemented on:2021-02-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $160.00
$156.00

Standard No:	GB/T 4698.10-2020
Document status:	VALID
Title in English:	Methods for chemical analysis of titanium sponge, titanium and titanium alloys—Part 10：Determination of chromium content—Ammonium ferrous sulfate titration and inductively coupled plasma atomic emission spectrometry（with vanadium）
Title in Chinese:	海绵钛、钛及钛合金化学分析方法第10部分：铬量的测定硫酸亚铁铵滴定法和电感耦合等离子体原子发射光谱法（含钒）
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-03-06
Implemented on:	2021-02-01
Superseding:	GB/T 4698.10-1996 Sponge titanium, titanium and titanium alloys - Determination of chromium content in the presence of Vanadium-Ammonium ferrous sulfate titration method
Professional Classification:	GB-National Standard
Related Keywords:	titration method ferrous sulfate titration titanium sponge titanium alloy detection technology titanium alloys part
Related Topics:	atomic emission spectrometry Titanium Alloy Inductive Coupling Potentiometric Titration Titanium Ion Titration of titanium ions Coupled inductor atomic coupling Titanium Ion Ammonium Sulfate Ammonium ion analysis method Inductively Coupled Plasma-Atomic Emission Spectrometry plasma atomic emission spectrometry Inductively Coupled Plasma Spectrophotometry Coupled inductor Atomic vanadium Titanium ion analysis Atomic Emission Inductively Coupled Plasma Inductively Coupled Plasma-Atomic Emission Spectrometry Inductively Coupled Plasma-Atomic Emission Spectrometry The relative atomic mass of titanium "Atomic Emission Spectroscopy" Coupled atoms Titanium Atomic Mass Titanium atomic weight Molecular weight of titanium Ammonium ion analysis test method Titanium Molecular Weight Opposing atoms of titanium and vanadium GB/T 4698.10 GB/T 4698.10-1996 GB/T 4698.10-2020 Sponge titanium, titanium and titanium alloy Titanium and titanium alloys (chemical analysis method) Titanium Alloy Chemical Analysis Method Ferrous Ammonium Sulfate Volumetric Method for Determination of Vanadium Content Sponge titanium, titanium and titanium alloy chemical analysis method titanium Chemical Analysis Methods of Titanium and Titanium Alloys gb/t4698.10-2020 Ferrous ion titration masking agent Principles of Atomic Emission Spectroscopy Calibration of ferrous ammonium sulfate solution Ferric ammonium sulfate indicating silver ion method Calcium ion titration analysis principle and determination method Method for testing iron ions on titanium head Titration method for ferrous ions Titanium alloy ion precipitation

《GB/T 4698.10-2020海绵钛、钛及钛合金化学分析方法第10部分：铬量的测定硫酸亚铁铵滴定法和电感耦合等离子体原子发射光谱法（含钒）》由TC243（全国有色金属标准化技术委员会）归口，TC243SC3（全国有色金属标准化技术委员会稀有金属分会）执行，主管部门为中国有色金属工业协会。

Introduction

Core changes in the standard revision

Technical indicators	1996 edition	2020 edition	Improvement significance
Determination range	0.30%-12.00%	Method 1: 0.30%-15.00% Method 2: 0.010%-15.00%	Extended detection limit, covering a wider content range
New methods	Ammonium ferrous sulfate titration method only	ICP-AES method added	Provide highly sensitive modern detection methods
Precision clause	Not specified	Add repeatability/reproducibility limit	Reliability index of quantitative method

Method 1: Technical analysis of ammonium ferrous sulfate titration

Key reaction mechanism:Separation and determination of vanadium and chromium by selective oxidation:
①Selective oxidation of vanadium by KMnO₄ at room temperature (V⁴⁺→V⁵⁺)
② Co-oxidation of vanadium chromium under heating conditions (NH₄)₂S₂O₈/AgNO₃ (Cr³⁺→Cr⁶⁺)

Typical operating parameters:
• Dissolution system: H₂SO₄(1+1)+HNO₃ digestion
• Indicator: N-phenylanthranilic acid (pink→yellow-green endpoint)
• Titrant concentration: 0.025mol/L (NH₄)₂Fe(SO₄)₂

Method 2: Key points of innovation in ICP-AES method

Instrument configuration requirements:
• Hydrofluoric acid resistant injection system
• Resolution <0.006nm@200nm
• Recommended analysis line: Cr 283.56nm

Sample pretreatment:
Dissolve in HCl-HF mixed acid, oxidize titanium with HNO₃, and use plastic volumetric flask to set the volume to prevent fluorine corrosion

Calibration strategy:
Establish working curves in sections (0.01-8% and 8-15%), and use high purity titanium (wCr <0.001%) for matrix matching

Implementation suggestions and precautions

Method selection principle:>0.3% preferably uses titration method (arbitration method), <0.3% must use ICP-AES method
Interference control: The vanadium content in the titration method must be accurately deducted, and the ICP-AES method should pay attention to the spectral interference of the titanium matrix
Quality control: Each batch of tests should be verified with a standard sample (such as YSBC18804-1 titanium alloy standard sample)
Safety protection: Calcium gluconate gel should be provided for emergency use when treating with hydrofluoric acid

Technology evolution analysis

This standard reflects the transformation of titanium alloy detection technology from traditional wet chemical method to instrumental analysis:
• 1984 version: Volumetric method only
• 1996 version: Optimized titration conditions
• 2020 Edition: Introducing ICP-AES to achieve full coverage of high and low content, and reduce the detection limit by 30 times

More samples: GB 18306-2015 JC/T 2453-2018 NB/T 47013.2-2015

Sample only — not a preview of GB/T 4698.10-2020

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