GB/T 30921.2-2016 in English
VALIDTest method of purified terephthalic acid (PTA) for industrial use—Part 2 ： Determination of metal content
- Issued on:2016-06-14
- Implemented on:2017-01-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
《GB/T 30921.2-2016工业用精对苯二甲酸（PTA）试验方法 第2部分：金属含量的测定》由TC63（全国化学标准化技术委员会）归口，TC63SC4（全国化学标准化技术委员会石油化学分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Interpretation of the Standard for Determination of Metal Content in Purified Terephthalic Acid (PTA)
Purified terephthalic acid (PTA) is an important chemical raw material and is widely used in industries such as polyester fiber, plastics and coatings. In order to ensure product quality, it is crucial to detect the content of metal impurities in it. The GB/T 30921.2-2016 standard specifies three determination methods in detail: flame atomic absorption spectrophotometry (Method A), graphite furnace atomic absorption spectrophotometry (Method B) and inductively coupled plasma emission spectrometry (Method C). This article will provide an in-depth interpretation of the standard background, technical details, and practical applications.
1. Background and significance of standard formulation
As a high-purity chemical product, the metal impurity content of PTA directly affects product quality and downstream application performance. The formulation of the GB/T 30921 series of standards fills the gap in this field in China and provides a scientific basis for industrial testing. This section (Part 2) focuses on metal content determination to ensure that PTA meets international and domestic market requirements.
2. Comparison of main determination methods
| Determination method | Applicable metal range | Detection limit (mg/kg) | Instrument requirements | Features |
|---|---|---|---|---|
| Method A (Flame Atomic Absorption Spectrophotometry) | Sodium, cobalt, manganese, iron, chromium, nickel, molybdenum, aluminum | 0.05-15.0 mg/L | Atomic absorption spectrophotometer, air-acetylene burner | High sensitivity, easy operation |
| Method B (Graphite Furnace Atomic Absorption Spectrophotometry) | Sodium, cobalt, manganese, iron, chromium, nickel, titanium, molybdenum, aluminum | 0.001-0.05 mg/kg | Atomic absorption spectrophotometer, graphite furnace accessory | Low detection limit, suitable for trace analysis |
| C method (inductively coupled plasma optical emission spectrometry) | Sodium, chromium, cobalt, aluminum, titanium, potassium, magnesium, manganese, iron, nickel, molybdenum, calcium | 0.02-55 mg/kg | Inductively coupled plasma optical emission spectrometer, internal standard method for quantitative | Multi-element simultaneous detection, accurate results |
3. Practical application case analysis
Case 1:A petrochemical enterprise used Method C to detect the calcium and magnesium content in PTA. Quantification by the internal standard method showed that the average values of calcium and magnesium were 0.12 mg/kg and 0.15 mg/kg, respectively, which met the requirements of industry standards.
4. Implementation suggestions
- Choose an appropriate method according to the detection needs (Method A has high sensitivity, Method B is suitable for trace analysis, and Method C detects multiple elements simultaneously)
- Strictly control the sample pretreatment process to avoid introducing interference factors
- Regularly calibrate the instrument to ensure data accuracy
- Establish a quality control system, including blank test and standard curve verification
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