GB/T 23844-2019 in English
VALIDGeneral method for the determination of sulphate in inorganic chemicals products
- Issued on:2019-10-18
- Implemented on:2020-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 23844-2019无机化工产品中硫酸盐测定通用方法》由TC63（全国化学标准化技术委员会）归口，TC63SC1（全国化学标准化技术委员会无机化工分会）执行，主管部门为中国石油和化学工业联合会。
Introduction
Analysis of the determination method and standard of sulfate in inorganic chemical products
Background and significance of the standard
GB/T 23844-2019 "General method for determination of sulfate in inorganic chemical products" is an important standard for the field of inorganic chemical industry, which aims to standardize the determination process of sulfate. This standard replaces the original visual turbidimetry and adds spectrophotometry and inductively coupled plasma emission spectrometry (ICP), which significantly improves the detection accuracy and scope of application.
With the diversification of inorganic chemical products and the advancement of technology, the determination method of sulfate is also being continuously optimized. The formulation of this standard provides a unified technical specification for the industry, ensuring the accuracy and comparability of data.
Comparison of three main determination methods
| Determination method | Principle | Scope of application | Detection accuracy |
|---|---|---|---|
| Visual turbidimetry | Based on the comparison of turbidity of barium sulfate precipitation with standard solution. | $0.4~\mu{\mathrm{g}}/{\mathrm{mL}}{\sim}4.0~\mu{\mathrm{g}}/{\mathrm{mL}}$ | Simple operation, low cost, but limited accuracy. |
| Spectrophotometry | Quantitative analysis of absorbance at a specific wavelength through barium sulfate precipitation. | $1.0~\mu{\mathrm{g/mL}}{\sim}10.0~\mu{\mathrm{g/mL}}$ | High precision, suitable for medium concentration range. |
| Inductively Coupled Plasma Emission Spectrometry (ICP) | Quantitative analysis using the characteristic spectrum of sulfur. | Not less than $0.25~\mu{\mathrm{g}}/{\mathrm{mL}}$ | High sensitivity, suitable for trace analysis. |
Detailed explanation of the determination method
Visual turbidimetry
Principle:In the hydrochloric acid medium, barium ions react with sulfate to form barium sulfate precipitation, and the content is determined by turbidity comparison.
Steps:After acidifying the sample, add the barium reagent, observe the turbidity and compare it with the standard solution.
Spectrophotometry
Principle:Based on the quantitative change of absorbance at a wavelength of 420nm based on barium sulfate precipitation.
Steps:Prepare a standard curve and determine the sulfate content in the sample by colorimetry.
Inductively Coupled Plasma Optical Emission Spectrometry
Principle:After the sample is dissolved, the characteristic spectrum of sulfur element is detected by ICP.
Steps:Prepare the sample solution, draw the standard curve, and determine the mass concentration of sulfate.
Implementation Suggestions
Selection of method:Choose the appropriate method according to the detection requirements and laboratory conditions. Visual turbidimetry is suitable for rapid initial screening, spectrophotometry is suitable for medium precision requirements, and ICP method is used for microanalysis.
Operation Precautions:Operate in strict accordance with the standard reagent preparation and instrument conditions.
Data processing: It is recommended to use professional software for data analysis and ensure that the deviation of parallel determination is within the allowable range.
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