GB/T 15076.7-2020 in English
VALIDMethods for chemical analysis of tantalum and niobium—Part 7:Determination of phospherus content in niobium—4-Formyloxy-pentyl ketone-[2] extraction separation phosphomolybdate blue spectrophotometry and inductively coupled plasma atomic emission spectrometry
- Issued on:2020-03-06
- Implemented on:2021-02-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$97.00
《GB/T 15076.7-2020钽铌化学分析方法 第7部分：铌中磷量的测定 4-甲基-戊酮-[2]萃取分离磷钼蓝分光光度法和电感耦合等离子体原子发射光谱法》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
Analysis of Standard Technology Evolution
GB/T15076.7-2020 is a major upgrade of the 1994 version of the standard. The main technical changes include:
- Expanding the detection range to 0.0010%~0.080%
- Adding ICP-AES as Method 2
- Optimizing the spectrophotometer wavelength to 725nm
- Establishing an arbitration mechanism (spectrophotometry is preferred for overlapping ranges)
Comparison of core methods
| Dimensions | Method 1 (spectrophotometry) | Method 2 (ICP-AES) |
|---|---|---|
| Detection range | 0.0010%-0.050% | 0.0010%-0.080% |
| Detection limit | 0.0004% (r value) | 0.0005% (r value) |
| Key reagents | 4-methyl-pentanone-[2] | High purity argon |
| Analysis time | About 45 minutes/sample | About 15 minutes/sample |
Key points for professional operation
Key controls for spectrophotometry
- The temperature sensitive stage must be controlled below 25℃
- The extraction oscillation time must be strictly 1±0.1 minutes
- The cuvette must be kept absolutely dry
Precautions for ICP-AES
- A hydrofluoric acid resistant injection system must be used
- Recommended analysis line 178.221nm
- Working curve linearity requirement R²≥0.999
Practical Application Recommendations
Method Selection Guide
Spectrophotometry is preferred for arbitration analysis or 0.001-0.05% range; ICP-AES is recommended for batch testing or high-content samples.
Sample processing specifications
- Niobium ingot sampling requires removal of 10cm of surface skin
- Niobium hydroxide needs to be dried at 105-110℃ for 2h
- Niobium carbide particle size should be <150μm
Impact of standard implementation
The new version of the standard improves the detection adaptability through complementary methods, including:
- The precision of the spectrophotometry method is improved by 30% (compared with the 1994 version)
- ICP-AES method realizes the possibility of multi-element joint measurement
- The newly added precision clause provides a basis for data comparison
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