CN103940888A - Method used for detecting anti-oxidant content of transformer oil via linear sweep voltammetry - Google Patents
Method used for detecting anti-oxidant content of transformer oil via linear sweep voltammetry Download PDFInfo
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- 238000004502 linear sweep voltammetry Methods 0.000 title claims abstract description 44
- 239000003963 antioxidant agent Substances 0.000 title claims abstract description 37
- 230000003078 antioxidant effect Effects 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 23
- 235000006708 antioxidants Nutrition 0.000 title 1
- 239000003115 supporting electrolyte Substances 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 7
- 239000010439 graphite Substances 0.000 claims abstract description 7
- 239000000523 sample Substances 0.000 claims description 26
- 230000003647 oxidation Effects 0.000 claims description 10
- 238000007254 oxidation reaction Methods 0.000 claims description 10
- 239000012496 blank sample Substances 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 8
- 238000000840 electrochemical analysis Methods 0.000 claims description 7
- 238000002360 preparation method Methods 0.000 claims description 7
- 238000000835 electrochemical detection Methods 0.000 claims description 5
- YLLIGHVCTUPGEH-UHFFFAOYSA-M potassium;ethanol;hydroxide Chemical compound [OH-].[K+].CCO YLLIGHVCTUPGEH-UHFFFAOYSA-M 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 4
- 229910021641 deionized water Inorganic materials 0.000 claims description 4
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 4
- 238000005498 polishing Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 230000035945 sensitivity Effects 0.000 claims description 3
- ZOMNIUBKTOKEHS-UHFFFAOYSA-L dimercury dichloride Chemical class Cl[Hg][Hg]Cl ZOMNIUBKTOKEHS-UHFFFAOYSA-L 0.000 claims description 2
- 229910052697 platinum Inorganic materials 0.000 claims description 2
- 238000012360 testing method Methods 0.000 claims 7
- 230000003449 preventive effect Effects 0.000 claims 3
- 238000004090 dissolution Methods 0.000 claims 2
- 230000005477 standard model Effects 0.000 claims 2
- 239000000203 mixture Substances 0.000 claims 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims 1
- 238000005259 measurement Methods 0.000 abstract description 16
- 238000004458 analytical method Methods 0.000 abstract description 6
- 230000000284 resting effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 5
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical group [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000004566 IR spectroscopy Methods 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000004811 liquid chromatography Methods 0.000 description 2
- 238000002798 spectrophotometry method Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002576 ketones Chemical class 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
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Abstract
本发明公开了利用线性扫描伏安法检测变压器油中抗氧化剂含量的方法，该方法是将一定量待测变压器油超声溶解于一定体积的支持电解质中，得到待测样，然后以直径6mm的石墨电极为工作电极，利用电化学工作站采用线性扫描伏安法，在特定的条件下，对待测样进行电化学检测，根据所得线性扫描伏安曲线图，在T501抗氧化剂特征峰的峰电流与其在变压器油中浓度成正比关系的基础上，建立起了利用线性扫描伏安法检测变压器油中T501抗氧化剂含量的方法。与现有技术相比，本发明不仅成本低廉、操作简单、测量迅速、准确度高，而且可实现对样品的现场分析，对于变压器油中T501抗氧化剂含量的快速准确测定，具有非常大的意义。The invention discloses a method for detecting antioxidant content in transformer oil by linear sweep voltammetry. The method is to ultrasonically dissolve a certain amount of transformer oil to be tested in a certain volume of supporting electrolyte to obtain a sample to be tested, and then use a 6mm diameter The graphite electrode is used as the working electrode, and the linear sweep voltammetry is used in the electrochemical workstation. Under specific conditions, the sample to be tested is electrochemically detected. On the basis of the proportional relationship between the concentration in transformer oil, a method for detecting the content of T501 antioxidant in transformer oil by linear sweep voltammetry was established. Compared with the prior art, the present invention is not only low in cost, simple in operation, fast in measurement and high in accuracy, but also can realize on-site analysis of samples, and has great significance for the rapid and accurate determination of T501 antioxidant content in transformer oil .
Description
技术领域 technical field
本发明属于化学检测技术领域，具体是利用线性扫描伏安法检测变压器油抗氧化剂含量的方法。 The invention belongs to the technical field of chemical detection, in particular to a method for detecting antioxidant content of transformer oil by linear sweep voltammetry. the
背景技术 Background technique
为了有效地完成变压器油多方面的功能，变压器油本身必须具备良好的化学、物理和电气等方面的性能。变压器油在运行过程中不可避免的要发生氧化，生成大量的过氧化物及醇、醛、酮、酸等氧化产物，这些氧化产物对于电力系统设备的安全运行具有非常大的危害。 In order to effectively complete the various functions of transformer oil, the transformer oil itself must have good chemical, physical and electrical properties. Transformer oil is inevitably oxidized during operation, producing a large amount of peroxides and oxidation products such as alcohols, aldehydes, ketones, acids, etc. These oxidation products are very harmful to the safe operation of power system equipment. the
变压器油在出厂时均添加有T501抗氧化剂，以改善油的氧化稳定性。但是过量的抗氧化剂会影响油品的电气性能，同时因净化器的投运、滤油机处理油中老化产物等因素的影响，油中抗氧化剂的含量会逐渐损耗。GB/T7595—2008《运行中变压器油质量标准》规定国产新油、再生油中T501质量分数不低于0.3%～0.5%，运行中油不低于0.15%，否则应进行补加。 Transformer oil is added with T501 antioxidant before leaving the factory to improve the oxidation stability of the oil. However, excessive antioxidants will affect the electrical properties of the oil. At the same time, due to factors such as the operation of the purifier and the aging products in the oil treated by the oil filter, the content of antioxidants in the oil will gradually be lost. GB/T7595—2008 "Quality Standards for Transformer Oil in Operation" stipulates that the mass fraction of T501 in domestic new oil and recycled oil should not be lower than 0.3% to 0.5%, and that in running oil should not be lower than 0.15%, otherwise it should be supplemented. the
目前，常用的检测变压器油中T501抗氧化剂含量的方法有分光光度法、液相色谱法以及红外光谱法，但是每一种方法都存在很大的缺陷：分光光度法，样品预处理复杂，所用仪器和药品较多，重复性差；液相色谱法和红外光谱法，检测相对准确，但仪器设备非常昂贵，测定时间较长，不利于方法的大面积推广。 At present, the commonly used methods for detecting the content of T501 antioxidant in transformer oil include spectrophotometry, liquid chromatography and infrared spectroscopy, but each method has great defects: spectrophotometry, sample pretreatment is complicated, and the used There are many instruments and medicines, and the repeatability is poor; liquid chromatography and infrared spectroscopy are relatively accurate in detection, but the instruments and equipment are very expensive, and the measurement time is long, which is not conducive to the large-scale promotion of the method. the
显而易见，目前还没有一种比较成熟且简单易行的变压器油中T501抗氧化剂含量的测定方法。 Obviously, there is no relatively mature and simple method for the determination of T501 antioxidant content in transformer oil. the
因此，开发出一种成本低廉、操作简单、测量迅速、准确度高的变压器油中T501抗氧化剂含量的测定方法，具有很大的意义。 Therefore, it is of great significance to develop a method for the determination of T501 antioxidant content in transformer oil with low cost, simple operation, rapid measurement and high accuracy. the
发明内容 Contents of the invention
本发明的目的是提供一种成本低廉、操作简单、测量迅速、准确度高的利用线性扫描伏安法检测变压器油抗氧化剂含量的方法，以克服现有技术所存在的缺陷和满足实际情况的需求。 The purpose of the present invention is to provide a method for detecting the antioxidant content of transformer oil by linear sweep voltammetry with low cost, simple operation, rapid measurement and high accuracy, so as to overcome the defects in the prior art and meet the requirements of actual conditions. need. the
本发明解决上述技术问题的技术方案如下： The technical scheme that the present invention solves the problems of the technologies described above is as follows:
利用线性扫描伏安法检测变压器油抗氧化剂含量的方法，包括以下步骤： Utilize the method for linear sweep voltammetry detection transformer oil antioxidant content, comprise the following steps:
1.工作电极的预处理：运用0.3μm氧化铝抛光粉打磨直径6mm的石墨电极，用去离子水冲洗，然后依次在去离子水、无水乙醇中分别超声2-3min。 1. Pretreatment of the working electrode: Use 0.3 μm alumina polishing powder to polish the graphite electrode with a diameter of 6 mm, rinse it with deionized water, and then ultrasonicate it in deionized water and absolute ethanol for 2-3 minutes respectively. the
2.待测样品的配制：将变压器油超声溶解于支持电解质中，其中变压器油和支持电解质体积比例为1～1.5∶50，所述支持电解质为0.1～0.3mol·L-1的氢氧化钾乙醇溶液。 2. Preparation of the sample to be tested: ultrasonically dissolve the transformer oil in the supporting electrolyte, wherein the volume ratio of the transformer oil and the supporting electrolyte is 1 to 1.5:50, and the supporting electrolyte is potassium hydroxide of 0.1 to 0.3 mol L -1 weak.
3.电化学检测：以直径6mm的石墨电极为工作电极，饱和甘汞电极为参比电极，213型铂电极为辅助电极，组成三电极体系，利用电化学工作站采用线性扫描伏安法对待测样品进行电化学测试。 3. Electrochemical detection: a graphite electrode with a diameter of 6mm is used as the working electrode, a saturated calomel electrode is used as the reference electrode, and a 213-type platinum electrode is used as the auxiliary electrode to form a three-electrode system. The samples were subjected to electrochemical tests. the
线性扫描伏安法的测定条件有两种，两种情况下所得线性扫描伏安图谱完全不同，均可得到T501抗氧化剂特征峰的峰电流与其在变压器油中浓度的正比线性关系，而且在所得线性扫描伏安曲线图中，T501抗氧化剂特征峰灵敏度都非常高、峰型平滑： There are two kinds of measurement conditions of linear sweep voltammetry, and the obtained linear sweep voltammetry spectra are completely different in both cases, and the proportional linear relationship between the peak current of T501 antioxidant characteristic peak and its concentration in transformer oil can be obtained, and in the obtained In the linear sweep voltammetry curve, the characteristic peak sensitivity of T501 antioxidant is very high, and the peak shape is smooth:
测定条件一：初始电位0V，终止电位-0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s。 Measurement condition 1: initial potential 0V, termination potential -0.4V, potential increment 0.1V·s -1 , sampling interval 0.001V, resting time 2s.
测定条件二：初始电位-0.4V，终止电位+0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s。 Measurement condition 2: initial potential -0.4V, end potential +0.4V, potential increment 0.1V·s -1 , sampling interval 0.001V, resting time 2s.
4.T501含量标准曲线的绘制：按照步骤2，分别依次将T501含量为0.01%、0.02%、0.03%、0.04%、0.05%、0.1%、0.2%、0.3%、0.4%、0.5%的标准变压器油样，配制为标准样品，然后利用线性扫描伏安法，按照步骤3，分别依次对所得的十种标准样品进行电化学测试，在所得线性扫描伏安曲线图对应的TXT 文本中，分别读取T501抗氧化剂特征峰的峰电流，以T501含量为横坐标，以峰电流为纵坐标，绘制出T501含量的标准曲线。 4. Draw the standard curve of T501 content: according to step 2, the T501 content is 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4%, 0.5% respectively Transformer oil samples were prepared as standard samples, and then by linear sweep voltammetry, according to step 3, electrochemical tests were carried out on the ten standard samples obtained in turn. In the TXT text corresponding to the obtained linear sweep voltammetry curves, respectively Read the peak current of the T501 antioxidant characteristic peak, take the T501 content as the abscissa, and take the peak current as the ordinate to draw the standard curve of the T501 content. the
5.待测油样中T501含量的测定：按照步骤2，取一定量的待测变压器油样超声溶解于一定体积的支持电解质中，配制得到待测样品，然后利用电化学工作站采用线性扫描伏安法，在相同的条件下，分别依次对空白样品、待测样品进行电化学测试，在所得线性扫描伏安曲线图对应的TXT文本中，读取T501抗氧化剂特征峰的峰电流P，将P带入标准曲线，计算得出待测油样中T501抗氧化剂含量。 5. Determination of T501 content in the oil sample to be tested: According to step 2, a certain amount of transformer oil sample to be tested is ultrasonically dissolved in a certain volume of supporting electrolyte to prepare the sample to be tested, and then the electrochemical workstation is used to linearly scan volts An method, under the same conditions, perform electrochemical tests on the blank sample and the sample to be tested in sequence, read the peak current P of the characteristic peak of T501 antioxidant in the TXT text corresponding to the obtained linear sweep voltammetry curve, and set P is brought into the standard curve, and the T501 antioxidant content in the oil sample to be tested is calculated. the
6.采用线性扫描伏安法，在相同的条件下，依次对空白样品、待测样品进行电化学测定，得到线性扫描伏安法特征曲线，在线性扫描伏安法特征曲线所对应的TXT文本中，读取图2中-0.3V～-0.1V区间内，T501抗氧化剂特征氧化峰的高度值P，将P值带入相应标准曲线，计算T501抗氧化剂含量。 6. Using linear sweep voltammetry, under the same conditions, electrochemically measure the blank sample and the sample to be tested in turn to obtain the linear sweep voltammetry characteristic curve, and the TXT text corresponding to the linear sweep voltammetry characteristic curve , read the height value P of the characteristic oxidation peak of T501 antioxidants in the range of -0.3V to -0.1V in Figure 2, and bring the P value into the corresponding standard curve to calculate the antioxidant content of T501. the
本发明具有如下有益效果： The present invention has the following beneficial effects:
（1）本发明方法不仅成本低廉、操作简单、测量迅速、准确度高，而且可实现对样品的现场分析、具有良好的稳定性和重现性，是对现行的电力用油抗氧化剂含量测量方法标准的一种强有力的补充，对于变压器油中T501抗氧化剂含量的快速准确测定，具有非常大的意义。 (1) The method of the present invention is not only low in cost, simple in operation, fast in measurement and high in accuracy, but also can realize on-site analysis of samples, has good stability and reproducibility, and is a good method for measuring the antioxidant content of current power oil A powerful supplement to the method standard is of great significance for the rapid and accurate determination of T501 antioxidant content in transformer oil. the
（2）本发明所采用的线性扫描伏安法，测定条件一为：初始电位0V，终止电位-0.4V，电位增量0.1V·s-1；测定条件二为：初始电位-0.4V，终止电位0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s。最大限度的优化了一种电化学测试方法最重要的三个方面：扫描方向、扫描范围以及扫描速度，大大提高了测量的灵敏度，降低了方法的测量下限。 (2) For the linear sweep voltammetry used in the present invention, the first measurement condition is: initial potential 0V, end potential -0.4V, potential increment 0.1V s -1 ; the second measurement condition is: initial potential -0.4V, The termination potential is 0.4V, the potential increment is 0.1V·s -1 , the sampling interval is 0.001V, and the resting time is 2s. The three most important aspects of an electrochemical test method are optimized to the greatest extent: scanning direction, scanning range and scanning speed, which greatly improves the sensitivity of the measurement and reduces the lower limit of the method.
（3）本发明采用直径6mm的石墨电极做为工作电极，采用0.1～0.3mol·L-1的氢氧化钾乙醇溶液做为支持电解质，采用的变压器油和支持电解质的溶解体积比例为（1～1.5）∶50，最大限度的优化了变压器油中T501抗氧化剂 含量的电化学测定条件，大大减小了测量误差，为实验所得结果的准确性提供了保证。 (3) The present invention adopts a graphite electrode with a diameter of 6 mm as the working electrode, adopts 0.1 to 0.3 mol L -1 potassium hydroxide ethanol solution as the supporting electrolyte, and the dissolved volume ratio of the transformer oil and the supporting electrolyte used is (1 ~1.5): 50, the electrochemical determination conditions of T501 antioxidant content in transformer oil were optimized to the greatest extent, the measurement error was greatly reduced, and the accuracy of the experimental results was guaranteed.
附图说明 Description of drawings
图1是本发明实施例1中在空白样品分析中所得的线性扫描伏安曲线图。 Fig. 1 is the linear sweep voltammetry graph obtained in the blank sample analysis in Example 1 of the present invention. the
图2是本发明实施例1中在待测样品分析中所得的线性扫描伏安曲线图。 Fig. 2 is a linear sweep voltammetry curve obtained in the analysis of the sample to be tested in Example 1 of the present invention. the
图3是本发明实施例2中在空白样品分析中所得的线性扫描伏安曲线图。 Fig. 3 is a linear sweep voltammetry curve obtained in the blank sample analysis in Example 2 of the present invention. the
图4是本发明实施例2中在待测样品分析中所得的线性扫描伏安曲线图。 Fig. 4 is a linear sweep voltammetry curve obtained in the analysis of the sample to be tested in Example 2 of the present invention. the
具体实施方式 Detailed ways
本发明的目的在于提供一种成本低廉、操作简单、测量迅速、准确度高的变压器油中T501抗氧化剂含量的测定方法，以克服现有技术所存在的缺陷和满足实际情况的需求。 The object of the present invention is to provide a low-cost, simple-to-operate, fast-measurement, high-accuracy method for determining the content of T501 antioxidants in transformer oil, so as to overcome the defects in the prior art and meet the needs of actual conditions. the
下面结合具体实施例对本发明作进一步说明： The present invention will be further described below in conjunction with specific embodiment:
实施例1 Example 1
利用线性扫描伏安法检测变压器油抗氧化剂含量的方法 Method for detecting antioxidant content in transformer oil by linear sweep voltammetry
检测步骤： Detection steps:
（1）配制0.2mol·L-1氢氧化钾乙醇溶液。 (1) Prepare 0.2mol·L -1 potassium hydroxide ethanol solution.
（2）工作电极的预处理：运用0.3μm氧化铝抛光粉打磨直径6mm的石墨电极，然后用去离子水冲洗，并在无水乙醇中超声3min。 (2) Pretreatment of the working electrode: use 0.3 μm alumina polishing powder to polish the graphite electrode with a diameter of 6 mm, then rinse it with deionized water, and ultrasonicate it in absolute ethanol for 3 min. the
（3）待测样品的配制：移取50ml0.2mol·L-1氢氧化钾乙醇溶液做为空白样品。移取1.5ml含有T501抗氧化剂质量分数为0.5%的标准变压器油，超声溶解于50ml0.2mol·L-1氢氧化钾乙醇溶液中，做为待测样品。 (3) Preparation of samples to be tested: pipette 50ml of 0.2mol·L -1 potassium hydroxide ethanol solution as a blank sample. Pipette 1.5ml of standard transformer oil containing T501 antioxidant with a mass fraction of 0.5%, and ultrasonically dissolve it in 50ml of 0.2mol·L -1 potassium hydroxide ethanol solution as the sample to be tested.
（4）选择线性扫描伏安法的测定条件为：初始电位0V，终止电位-0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s。 (4) The measurement conditions of linear sweep voltammetry were selected as follows: initial potential 0V, end potential -0.4V, potential increment 0.1V·s -1 , sampling interval 0.001V, resting time 2s.
（5）T501含量标准曲线的绘制：按照待测样品的配制步骤，分别依次将T501含量为0.01%、0.02%、0.03%、0.04%、0.05%、0.1%、0.2%、0.3%、0.4%、0.5%的标准变压器油样，配制为标准样品，然后利用线性扫描伏安法，按照电化学检测步骤，分别依次对所得的十种标准样品进行电化学测试，在所得线性扫描伏安曲线图对应的TXT文本中，分别读取T501抗氧化剂特征峰的峰电流，以T501含量为横坐标，以峰电流为纵坐标，绘制出T501含量的标准曲线。 (5) Draw the standard curve of T501 content: According to the preparation steps of the samples to be tested, the T501 content is respectively 0.01%, 0.02%, 0.03%, 0.04%, 0.05%, 0.1%, 0.2%, 0.3%, 0.4% , 0.5% standard transformer oil sample, prepared as a standard sample, and then using linear sweep voltammetry, according to the electrochemical detection steps, the ten standard samples obtained were sequentially electrochemically tested, and the obtained linear sweep voltammetry curve In the corresponding TXT text, read the peak current of the T501 antioxidant characteristic peak respectively, take the T501 content as the abscissa, and take the peak current as the ordinate, and draw the standard curve of the T501 content. the
（6）采用线性扫描伏安法，在相同的条件下，依次对空白样品、待测样品进行电化学测定，测定条件为：初始电位0V，终止电位-0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s，得到线性扫描伏安法特征曲线（图1和图2）。在线性扫描伏安法特征曲线所对应的TXT文本中，读取图2中-0.3V～-0.1V区间内，T501抗氧化剂特征氧化峰的高度值P，P=1.979e-5A。将P值带入相应标准曲线，计算T501抗氧化剂含量X，X=0.497%。 (6) Using linear sweep voltammetry, under the same conditions, electrochemically measure the blank sample and the sample to be tested in turn. The measurement conditions are: initial potential 0V, termination potential -0.4V, potential increment 0.1V s -1 , the sampling interval is 0.001V, and the resting time is 2s, the characteristic curve of linear sweep voltammetry is obtained (Figure 1 and Figure 2). In the TXT text corresponding to the characteristic curve of linear sweep voltammetry, read the height value P of the characteristic oxidation peak of T501 antioxidant in the range of -0.3V to -0.1V in Figure 2, P=1.979e-5A. Put the P value into the corresponding standard curve to calculate the antioxidant content X of T501, X=0.497%.
实施例2 Example 2
利用线性扫描伏安法检测变压器油抗氧化剂含量的方法 Method for detecting antioxidant content in transformer oil by linear sweep voltammetry
检测步骤： Detection steps:
在实施例2中，步骤同实施例1，区别仅在于线性扫描伏安法测定条件改为：初始电位-0.4V，终止电位+0.4V，电位增量0.1V·s-1，采样间隔0.001V，静置时间2s，在该条件下，依次对空白样品、待测样品进行电化学测定，得到线性扫描伏安法特征曲线（图3和图4）。 In Example 2, the steps are the same as in Example 1, the only difference is that the measurement conditions of linear sweep voltammetry are changed to: initial potential -0.4V, end potential +0.4V, potential increment 0.1V s -1 , sampling interval 0.001 V, the resting time is 2s. Under this condition, the blank sample and the sample to be tested are electrochemically measured in sequence to obtain the characteristic curve of linear sweep voltammetry (Figure 3 and Figure 4).
在线性扫描伏安法特征曲线所对应的TXT文本中，读取图4中-0.3V～-0.1V区间内，T501抗氧化剂特征氧化峰的高度值P，P=-2.776e-5A。将P值带入相应标准曲线，计算T501抗氧化剂含量X，X=0.498%。 In the TXT text corresponding to the characteristic curve of linear sweep voltammetry, read the height value P of the characteristic oxidation peak of T501 antioxidant in the range of -0.3V to -0.1V in Figure 4, P=-2.776e-5A. Put the P value into the corresponding standard curve to calculate the antioxidant content X of T501, X=0.498%. the
以上仅为本发明的具体实施例，并不以此限定本发明的保护范围；在不违反本发明构思的基础上所作的任何替换与改进，均属本发明的保护范围。 The above are only specific embodiments of the present invention, and do not limit the protection scope of the present invention; any replacement and improvement made on the basis of not violating the concept of the present invention shall fall within the protection scope of the present invention. the
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