Method for accurately detecting dioxin generated by phenols in chlorine bleaching aqueous solution system

Abstract

The invention provides a method for accurately detecting dioxin generated by phenols in a chlorine bleaching aqueous solution system. Specifically, the method is characterized in that: phenols markedby <13>C<6> are added into a natural phenol aqueous solution chlorine bleaching system to mix, then a mixture is used for bleaching, a bleaching sample is obtained and then extracted and purified, a high-resolution gas chromatography-high resolution mass spectrometry is used to perform qualitative and quantitative analysis on a dioxin target object, and whether the phenols can be converted to generate PCDD / Fs in the process is judged through detection of the PCDD / Fs generated by bleaching, especially <13>C<6><12>C<6>-PCDD / Fs. The method of the invention has the beneficial effects that: the method starts from the essence of a structure, has strict logic and simple operation, and can accurately judge whether the phenols are precursor substances for generating the PCDD / Fs in the chlorine bleaching process, at the same time, the adopted mass spectrometry method can simultaneously measure the content of the <13>C<6><12>C<6>-PCDD / Fs in a sample, thereby expanding the range of dioxin detection and improving analysis and detection efficiency.

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...

AI Technical Summary

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.

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