GB/T 14949.5-2021 in English
VALIDManganese ores一Determination of titanium content一Diantipyrylmethane spectrophotometric method
- Issued on:2021-05-21
- Implemented on:2021-12-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
《GB/T 14949.5-2021锰矿石 钛含量的测定 二安替吡啉甲烷分光光度法》由TC318（全国生铁及铁合金标准化技术委员会）归口，TC318SC2（全国生铁及铁合金标准化技术委员会锰矿石与铬矿石分会）执行，主管部门为中国钢铁工业协会。
Introduction
Core changes in the standard revision
| Revision items | 1994 edition | 2021 edition | Technical significance |
|---|---|---|---|
| Detection object | Determination of total titanium only | Add determination of titanium dioxide and metallic titanium | Expand element form analysis capability |
| Precision expression | Allowance difference | Repeatability limit r and reproducibility limit R | Conform to GB/T6379 statistical specification |
| Sample processing | Drying not specified | Drying at 105-110℃ for 2h | Uniform reference material state |
Method principle and technical points
Use spectrophotometer to determine titanium-diacpyridine methane yellow complex at a wavelength of 385nm. Key control points:
- Acidity control: 1.0-1.2mol/L hydrochloric acid medium (pH≈1)
- Color development time: 20min above 20℃, 40-60min below 20℃
- Interference elimination: Ascorbic acid reduces oxidizing ions such as Fe³⁺
Comparative analysis of the new and old standards
Main differences from ISO7723:1984:
- Added the Platinum crucible ash treatment step (Clause 6.1)
- Modified the calibration curve drawing method (Clause 8.5)
- The sample size of the precision test increased from 6 laboratories to 8
Comparison of typical sample measurement data:
| Sample | 1994 version result (%) | 2021 version result (%) | Relative deviation |
|---|---|---|---|
| Manganese concentrate A | 0.214 | 0.208 | 2.8% |
| Sintered ore B | 0.387 | 0.398 | 2.8% |
Implementation suggestions
Laboratory upgrade requirements:
- Requires to be equipped with a muffle furnace (700-750℃ controllable)
- It is recommended to use spectrally pure titanium dioxide (Clause 5.11)
- The color developer must be prepared and used immediately (Clause 5.13)
Quality control points:
- Perform double parallel determination for each batch of samples (Clause 8.2)
- Handle abnormal data according to the flowchart in Appendix C
- Regularly verify the linearity of the calibration curve (r≥0.999)
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