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GB/T 12690.6-2017 English PDF

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GB/T 12690.6-2017: Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 6: Determination of iron content -- Kalium thiocyanate,1,10-Phenanthroline spectrophotometric method
Status: Valid

GB/T 12690.6: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB/T 12690.6-2017	English	119	Add to Cart	3 days [Need to translate]	Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 6: Determination of iron content -- Kalium thiocyanate,1,10-Phenanthroline spectrophotometric method	Valid	GB/T 12690.6-2017
GB/T 12690.6-2003	English	239	Add to Cart	3 days [Need to translate]	Chemical analysis methods for non-rare earth impurities of rare earth metals and their oxides -- Determination of iron content -- Kalium thiocyanate, 1, 10-phenanthroline spectrophotometric method	Obsolete	GB/T 12690.6-2003
GB/T 12690.6-1990	English	199	Add to Cart	2 days [Need to translate]	Praseodymium oxide--Determination of lanthanum oxide, cerium oxide, neodymium oxide, samarium oxide and yttrium oxide contents--Emission spectrographic method	Obsolete	GB/T 12690.6-1990

PDF similar to GB/T 12690.6-2017

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Basic data

Standard ID	GB/T 12690.6-2017 (GB/T12690.6-2017)
Description (Translated English)	Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 6: Determination of iron content -- Kalium thiocyanate,1,10-Phenanthroline spectrophotometric method
Sector / Industry	National Standard (Recommended)
Classification of Chinese Standard	H14
Classification of International Standard	77.120.99
Word Count Estimation	6,623
Date of Issue	2017-10-14
Date of Implementation	2018-05-01
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 12690.6-2017: Chemical analysis methods for non-rare earth impurity of rare earth metals and their oxides -- Part 6: Determination of iron content -- Kalium thiocyanate,1,10-Phenanthroline spectrophotometric method

---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 for non-rare earth impurity of rare earth metals and their oxides - Part 6 Determination of iron content - Kslium thiocyanate, 1, 10-Phenanthroline spectrophotometric method ICS 77.120.99 H14 National Standards of People's Republic of China Replacing GB/T 12690.6-2003 Non-rare earth impurities in rare earth metals and their oxides Chemical analysis methods Part 6. Determination of iron content Potassium thiocyanate, 1,10-phenanthroline spectrophotometry Chemicalanalysis methods for non-rareearthimpurityof Part 6.Determinationofironcontent- Ksliumthiocyanate, 1,10-Phenanthrolinespectrophotometric method 2017-10-14 published.2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

GB/T 12690 "rare earth metals and oxides non-rare earth impurities chemical analysis method" is divided into 18 parts. --- Part 1. Determination of carbon, sulfur content High-frequency - infrared absorption method; --- Part 2. Determination of ignition loss in rare earth oxides gravimetric method; --- Part 3. Determination of water content in rare earth oxides gravimetric method; --- Part 4. Determination of oxygen and nitrogen content Pulsed - infrared absorption and pulse - thermal conductivity method; --- Part 5. Determination of cobalt, manganese, lead, nickel, copper, zinc, aluminum, chromium, magnesium, cadmium, vanadium and iron content; --- Part 6. Determination of iron content potassium thiocyanate, 1,10-phenanthroline spectrophotometry; --- Part 7. Determination of silicon content molybdenum blue spectrophotometry; --- Part 8. Determination of sodium content; Flame atomic absorption spectrometry; --- Part 9. Determination of chlorine content silver nitrate turbidimetric method; --- Part 10. Determination of phosphorus content molybdenum blue spectrophotometry; --- Part 11. Determination of magnesium content by flame atomic absorption spectrometry; --- Part 12. Determination of thorium content; --- Part 13. Determination of molybdenum and tungsten content; --- Part 14. Determination of titanium content; --- Part 15. Determination of calcium content; --- Part 16. Determination of fluorine content ion selective electrode method; --- Part 17. Determination of niobium and tantalum in rare earth metals; --- Part 18. Determination of zirconium content. This section GB/T 12690 Part 6. This section drafted in accordance with GB/T 1.1-2009 given rules. This Part Replaces GB/T 12690.6-2003 "Determination of iron content in rare earth metals and their oxides non-rare earth impurities - Determination of iron content Potassium thiocyanate, 1,10-phenanthroline spectrophotometry. " This section compared with GB/T 12690.6-2003, in addition to editorial changes outside the main technical changes are as follows. --- Modify the sample preheating conditions, pre-dried from 900 ℃ 1h into the oven at 105 ℃ bake 1h; --- Modify the repeatability and allowable difference. This part of the National Rare Earth Standardization Technical Committee (SAC/TC229) and focal point. This part of the drafting unit. Jiangyin Jiahua New Materials Resources Co., Ltd., China Nonferrous Metals Industry Standards Institute of Metrology and Quality, Soil Group Co., Ltd., Baotou Rare Earth Research Institute, Ganzhou dawn Rare Earth New Materials Co., The main drafters of this section. Yao Jingbi, Zhu Hongchun, Zheng Xingqin, Wen Bin, Chen Yan, Yu Yahui, Yao Nanhong, Zhu Ni, Guo Yongjiao, Dong Tao, Liu Ping, Xie Guohua, Tan Qiaozhen. This part replaces the standards previously issued as. --- GB/T 12690.6-2003. GB/T 12690.6-2003 by GB/T 11074.3-1989 and GB/T 12690.20- 1990 merged. Non-rare earth impurities in rare earth metals and their oxides Chemical analysis methods Part 6. Determination of iron content Potassium thiocyanate, 1,10-phenanthroline spectrophotometry

1 Scope

This part of GB/T 12690 specifies the determination of iron content in rare earth metals and their oxides. This section applies to the determination of iron in rare earth metals and their oxides. Measuring range. 0.0001% to 0.0050%.

2 method summary

The sample is dissolved in hydrochloric acid or nitric acid. In a slightly acidic medium, iron forms a purple-red ternary complex with potassium thiocyanate and 1,10-phenanthroline, The complex was extracted with methyl isobutyl ketone and its absorbance was measured at a spectrophotometer wavelength of 520 nm.

3 reagent

3.1 Hydrogen peroxide (30%). 3.2 methyl isobutyl ketone. 3.3 Hydrochloric acid (1 1), excellent grade pure. 3.4 nitric acid (1 1), excellent grade pure. 3.5 Potassium thiocyanate solution (500 g/L). 3.6 1,10-phenanthroline ethanol solution (2.5g/L). Weigh 0.25g1,10-phenanthroline dissolved in 100mL of ethanol. 3.7 iron standard storage solution Accurately weigh 0.1000g iron (99.9%) in 150mL beaker, add 30mL hydrochloric acid (3.3), low temperature plus Heat until dissolved, cool to room temperature. Into a 1000mL volumetric flask, diluted with water to the mark, shake. This solution contains 1mL 100 μg iron. 3.8 iron standard solution Pipette 10.00mL iron standard stock solution (3.7) in 1000mL volumetric flask, diluted with water to the mark, shake. 1 mL of this solution contains 1 μg of iron.

4 instruments

Spectrophotometer.

5 sample

5.1 Sample in the oven at 105 ℃ bake 1h, and placed in a desiccator cooled to room temperature for use. 5.2 metal samples need to remove the surface oxide layer, immediately after the sample weighed.

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