GB/T 32102-2015 in English
VALIDDetermination for assay of organic peroxides―Iodometric method
- Issued on:2015-10-09
- Implemented on:2016-05-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
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《GB/T 32102-2015有机过氧化物含量的测定 碘量法》由TC63（全国化学标准化技术委员会）归口，TC63SC2（全国化学标准化技术委员会有机化工分会）执行，主管部门为中国石油和化学工业联合会。
本标准规定了用碘量法测定有机过氧化物含量的试验方法。本标准规定了三种检测方法,即碘化钾-室温检测方法、碘化钾-氯化铜催化检测方法和碘化钾-60℃检测方法。
本标准适用于有机过氧化物纯度的分析。
Introduction
GB/T 32102—2015 Determination of organic peroxide content - iodine titration
Background of standard formulation and analysis of technological evolution
GB/T 32102—2015 "Determination of organic peroxide content - iodine titration" is an important national standard for organic peroxide detection in China. This standard was issued in 2015 and aims to standardize the quantitative determination of various types of organic peroxides, including diacyl, dibasic acid, esters and other types by iodine titration. With the development of the organic synthesis industry, peroxides are increasingly used in chemical reactions, and the accurate determination of their content is of great significance to product quality control and safe production.
Principle of iodine titration
The iodine titration is based on the reaction of organic peroxides with potassium iodide solution to generate iodine. The generated iodine reacts with the sodium thiosulfate standard titration solution, and the active oxygen content is calculated by the volume of sodium thiosulfate consumed. This method has the characteristics of high sensitivity and simple operation.
Test Method Comparison Table
| Method Name | Applicable Peroxide Type | Key Steps | Precautions |
|---|---|---|---|
| Potassium Iodide-Room Temperature Test Method | Benzoyl Peroxide, Peroxysuccinic Acid | The sample is dissolved in dichloromethane and glacial acetic acid, saturated potassium iodide solution is added, and the reaction is allowed to stand at room temperature. | Avoid photosensitivity reaction and operate in dark. |
| Potassium iodide-copper chloride catalytic detection method | Ester peroxide | Add copper chloride solution as a catalyst and react at 60℃. | Strictly control the temperature to avoid side reactions. |
| Potassium iodide-60℃ detection method | Specific types such as tert-butyl peroxyacetate | React in a 60℃ water bath and add hydrochloric acid if necessary. | Pay attention to safety protection under high temperature conditions. |
Calculation of active oxygen content
Active oxygen content (X) is calculated according to formula (2):
X = [(V1 - V2) × c × 0.008] / m × 100%
- V1: volume of sodium thiosulfate standard titration solution consumed by the sample (mL)
- V2: volume consumed in the blank test (mL)
- c: concentration of sodium thiosulfate (mol/L)
- m: mass of sample (g)
The result is expressed in %, accurate to 0.01%, and the average value of two parallel determinations is taken.
Implementation suggestions
- Laboratory conditions: Equipped with iodine volume bottle, 50mL burette, analytical balance (sensitivity 0.0001g) and other instruments.
- Reagent preparation: Sodium thiosulfate standard solution must be prepared according to GB/T 601, and saturated potassium iodide solution must be prepared before use.
- Operator training: It is recommended to conduct method verification and comparison tests regularly to ensure the accuracy of the results.
- Data processing: Perform numerical rounding according to GB/T 8170 and record the complete experimental process.
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