GB/T 12690.17-2010 English PDF

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GB/T 12690.17-2010: Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 17: Determination of niobium and tantalum contents of rare earth metals
Status: Valid

GB/T 12690.17: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 12690.17-2010	229	Add to Cart	3 days	Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 17: Determination of niobium and tantalum contents of rare earth metals	Valid
GB/T 12690.17-1990	199	Add to Cart	2 days	Rare-earth metals and their oxides--Determination of calcium content--Nitrous oxide-acetylene flame atomic absorption spectrometric method	Obsolete

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Basic data

Standard ID: GB/T 12690.17-2010 (GB/T12690.17-2010)
Description (Translated English): Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 17: Determination of niobium and tantalum contents of rare earth metals
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 10,196
Date of Issue: 1/14/2011
Date of Implementation: 11/1/2011
Regulation (derived from): Announcement of Newly Approved National Standards No. 2 of 2011
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
Summary: This Standard specifies a single rare earth metals niobium, tantalum content determination. The standard method is suitable for niobium, tantalum content was measured single rare earth content. Measurement range: 0. 010% to 0. 50% niobium; Tantalum 0. 020% to 0. 50%.

GB/T 12690.17-2010: Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides -- Part 17: Determination of niobium and tantalum contents of rare earth metals

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemical analysis methods of non-rare earth impurities in rare earth metals and the oxides Part 17. Determination of niobium and tantalum contents of rare earth metals ICS 77.120.99 H14 National Standards of People's Republic of China Non - rare earth impurities in rare earth metals and their oxides Methods for chemical analysis Part 17. rare earth metals niobium, tantalum content determination Part 17. Determinationofniobiumandtantalumcontentsofrareearthmetals Issued on. 2011-01-14 2011-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 12690 "non - rare earth impurities in rare earth metals and their oxides chemical analysis method" is divided into 17 parts. --- Part 1. Carbon and sulfur content was measured high-frequency infrared method; --- Part 2. Determination of the weight loss on ignition; --- Part 3. rare earth oxide in water content - Gravimetric method; --- Part 4. oxygen, nitrogen pulse measurement - infrared absorption method and pulse - heating thermal conductivity; --- Part 5. aluminum, chromium, manganese, iron, cobalt, nickel, copper, zinc, lead content was measured; --- Part 6. Determination of iron content of potassium thiocyanate, 1,10-phenanthroline spectrophotometry; --- Part 7. Determination of silicon content - Molybdenum blue spectrophotometric method; --- Part 8. Determination of sodium content by flame atomic absorption spectrometry; --- Part 9. Determination of chlorine content of silver nitrate turbidimetry; --- Part 10. Determination of phosphorus content - Molybdenum blue spectrophotometric method; --- Part 11. Determination of magnesium content - Flame atomic absorption spectrometry; --- Part 12. Determination of the amount of thorium; --- Part 13. Determination of tungsten, molybdenum content; --- Part 14. Determination of titanium content; --- Part 15. Determination of calcium; --- Part 16. Determination of the amount of fluorine ion selective electrode; --- Part 17. rare earth metals niobium and tantalum contents. This is Part 17. The determination of the scope of the overlapping portions of the two methods appear to arbitration as a Tier 2 method. This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized. This part by the Beijing Nonferrous Metal Research Institute, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. Part 1 was drafted by the Beijing Nonferrous Metal Research Institute. Method 1 of this section by the Baotou Rare Earth Research Institute, Inner Mongolia Baotou Steel Rare Earth (Group) Hi-Tech Company participated in the drafting. The main drafters of this Part 1. Liupeng Yu, Shao Rongzhen, Bing. Method 1 of this section participate drafters. Yumei, gold Siqin, Yang Chunhong, Wei Xiao Ou, Cao Junjie. Method 2 This part was drafted by the Beijing Nonferrous Metal Research Institute. Method 2 of this section by the Baotou Rare Earth Research Institute, Inner Mongolia Baotou Steel Rare Earth (Group) Hi-Tech Company participated in the drafting. The main drafters of this section Method 2. Liupeng Yu, Shao Rongzhen, Bing. Method 2 of this section participate drafters. Do Muoi, including maid, often Ruimin, Zhang Guimei. Non - rare earth impurities in rare earth metals and their oxides Methods for chemical analysis Part 17. rare earth metals niobium, tantalum content determination Method 1 inductively coupled plasma emission spectrometry

1 Scope

GB/T 12690 Method 1 of this section provides a single method for the determination of rare earth metals niobium, tantalum content. Part 1 of this method for the determination of a single rare earth metals niobium and tantalum content. Measurement range. 0.010% to 0.50% of niobium; tantalum 0.020% to 0.50%.

2 principle of the method

Sample with nitric acid, hydrofluoric acid is dissolved, after the separation of rare earth matrix ion spectrometry argon.

3 Reagents and materials

3.1 Hydrofluoric acid (ρ1.14g/mL). 3.2 nitric acid (11). 3.3 boric acid solution (100g/L). 3.4 niobium standard stock solution. Weigh 1.0000g niobium [w (Nb) ≥99.99%] in Teflon beaker, add 5mL hydrogen Hydrofluoric acid (3.1), heated and dissolved to clear after cooling transferred to 1000mL volumetric flask, supplemented with 35mL hydrofluoric acid (3.1), dilute to the mark, Mix well. 1mL solution containing 1mg niobium. Stored in plastic bottles. 3.5 tantalum standard stock solution. Weigh 1.0000g tantalum [w (Ta) ≥99.99%] in Teflon beaker, add 5mL hydrogen Hydrofluoric acid (3.1), heated and dissolved to clear after cooling transferred to 1000mL volumetric flask, supplemented with 35mL hydrofluoric acid (3.1), dilute to the mark, Mix well. 1mL solution containing 1mg tantalum. Stored in plastic bottles. 3.6 mixed standard solution. Pipette 5mL niobium standard stock solution (3.4), 5mL tantalum standard stock solution (3.5) in 100mL flask Added 2mL of hydrofluoric acid (3.1), dilute to the mark and mix. This solution 1mL containing 50μg niobium, 50μg tantalum. Stored in plastic Bottle. 3.7 Argon [w (Ar) ≥99.99%].

4 Instrument

4.1 Inductively coupled plasma spectrometer with a resolution of < 0.006nm (200nm office). 4.2 source. argon plasma light source.

5 Sample

The sample surface oxide layer is removed and weighed immediately after sampling. ......

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