GB/T 30921.4-2016Test method of purified terephthalic acid (PTA) for industrial use—Part 4: Determination of titanium content—Diantipyrylmethane photometric method (English PDF)
工业用精对苯二甲酸（PTA）试验方法 第4部分：钛含量的测定 二安替吡啉甲烷分光光度法
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
June 14, 2016
Implementation date
January 1, 2017
Scope
GB/T 30921.4-2016 is the English-translated version of 工业用精对苯二甲酸（PTA）试验方法 第4部分：钛含量的测定 二安替吡啉甲烷分光光度法.
GB/T 30921.4-2016 is the Chinese standard "Test method of purified terephthalic acid (PTA) for industrial use—Part 4: Determination of titanium content—Diantipyrylmethane photometric method".
Its scope clause reads: This part of GB/T 30921 specifies the spectrophotometric method for the determination of titanium content in industrial terephthalic acid (PTA).
This part is applicable to the determination of titanium content of not less than 0.020mg/kg in industrial terephthalic acid (PTA). Its clauses include normative reference documents; method summary; reagents and materials.
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Document preview — GB/T 30921.4-2016
National Standard of the People's Republic of China
- ICS
- 71.080.40
- Classification
- G 16
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 normative reference documents
- 3 method summary
- 4 Reagents and Materials
1 Scope
This part of GB/T 30921 specifies the spectrophotometric method for the determination of titanium content in industrial terephthalic acid (PTA).
This part is applicable to the determination of titanium content of not less than 0.020mg/kg in industrial terephthalic acid (PTA).
2 normative reference documents
The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article
Pieces. For undated references, the latest edition (including all modifications) applies to this document.
Preparation of standard solutions for the determination of impurities in chemical reagents GB/T 602-2002
General rules for sampling of solid chemical products GB/T GB/T 6682 Analytical laboratory water specifications and test methods
Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170
3 method summary
Under the conditions specified in this section, the PTA sample is treated ashes and the ash is dissolved in the sulfuric acid solution. In the hydrochloric acid medium, (DAM) to form a yellow complex, measured at the wavelength of 420nm absorbance, the concentration of titanium in the sample,
According to the standard curve.
4 Reagents and Materials
4.1
Unless otherwise specified, all reagents are of analytical grade and the test water complies with the provisions of GB/T 6682.
4.2 sulfuric acid solution
1 1, with excellent grade pure sulfuric acid preparation.
4.3 hydrochloric acid
excellent grade pure.
4.4 ascorbic acid solution (30g/L)
Weigh 30g ascorbic acid, dissolved in 1L water, shake.
4.5 Diantipyrylmethane (DAM) solution (50g/L)
Weigh 50gDAM, dissolved in 1L hydrochloric acid solution [c (HCl) = 1mol/L]
Shake well.
4.6
Titanium standard stock solution (1.0mg/mL) can be prepared according to GB/T 602-2002 in Table 1, No. 51, or commercially available.
4.7
Titanium standard solution (0.001mg/mL). absorb titanium standard stock solution (4.6) 1.0mL in 1000mL volumetric flask, 1% (volume
Fraction) of the hydrochloric acid solution was diluted to the mark. The solution is prepared before use.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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Related Standards
GB/T 30921.1-2014 — Test method of purified terephthalic acid (PTA) for industrial use - Part 1: Determination of concentrations of 4-carboxybenzaldehyde (4-CBA) and p-toluic acid (p-TOL)
GB/T 30921.2-2016 — Test method of purified terephthalic acid (PTA) for industrial use—Part 2: Determination of metal content
GB/T 30921.3-2016 — Test method of purified terephthalic acid (PTA) for industrial use - Part 3: Determination of water content
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