A method for accurately testing phenols to generate dioxins in a chlorine bleach aqueous solution system
An aqueous solution and dioxin technology, which is used in the field of accurate detection of phenols to generate dioxins
Active Publication Date: 2021-04-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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Problems solved by technology
The current research has not yet started from the molecular structure of phenols and PCDD / Fs, and introduced 13 C 6 Labeled phenols and 13 C 6 12 C 6 -PCDD / Fs, eliminate the interference of natural PCDD / Fs in the environment, especially low-chlorinated PCDD / Fs, and directly confirm that phenols are the precursor substances for the formation of PCDD / Fs.
Method used
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Embodiment 1
[0077] Mix 0.5g phenol with 0.5mg 13 C 6 -Phenol is bleached, extracted, purified and analyzed according to the above steps, and the phenol in the detection calculation sample 12 C 12 -PCDD / Fs natural compounds and 13 C 6 12 C 6 -PCDD / Fs. At the same time, the bleaching experiment with only 0.5 g of phenol and the blank experiment with phenol unbleached were carried out as a control group, and all the reaction conditions, pretreatment and instrumental analysis steps were the same. 2 copies in parallel. The recovery rate of the internal standard was 25-73%. The detection limit of the instrument and the detection limit of the method are shown in Table 2.
[0078] Table 2
[0079]
[0080]
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The invention provides a method for accurately detecting dioxin produced by phenols in a chlorine bleach aqueous solution system. Specifically, it is added to the natural phenolic aqueous solution chlorine bleaching system 13 C 6 Labeled phenols are mixed and used for bleaching. After extraction and purification of bleached samples, high-resolution gas chromatography-high-resolution mass spectrometry is used for qualitative and quantitative analysis of dioxin targets. By detecting PCDD / Fs generated by bleaching, especially Yes 13 C 6 12 C 6 ‑PCDD / Fs, to determine whether phenols can be converted into PCDD / Fs in this process. Starting from the essence of structure, this test method has strict logic and simple operation. It can accurately determine whether phenols are the precursor substances of PCDD / Fs in the process of chlorine bleaching. At the same time, the mass spectrometry method used can simultaneously determine the 13 C 6 12 C 6 ‑The content of PCDD / Fs expands the scope of dioxin detection and improves the efficiency of analysis and detection.
Description
technical field [0001] The invention relates to a method for accurately detecting dioxins produced by phenols in a chlorine bleach aqueous solution system, belonging to the field of persistent pollutant analysis. Specifically, it is added to the natural phenolic aqueous solution chlorine bleaching system 13 C 6 The labeled phenols are used for bleaching. After the bleached samples are extracted and purified, high-resolution gas chromatography-high-resolution mass spectrometry is used for qualitative and quantitative analysis of dioxin targets. By detecting PCDD / Fs generated by bleaching, especially 13 C 6 12 C 6 -PCDD / Fs, to determine whether phenols can be transformed into PCDD / Fs in this process, and provide a direct basis for the study of the formation mechanism of PCDD / Fs. Background technique [0002] Dioxin (PCDD / Fs) is one of the first persistent pollutants in the Stockholm Convention. It has high toxicity, environmental persistence, long-distance migration and b...
Claims
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IPC IPC(8): G01N30/02G01N30/14
CPCG01N30/02G01N30/14
Inventor 夏科学倪余文张亦弛张海军陈吉平
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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