邻苯二甲酸二丁酯降解过程的单体同位素分析

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Abstract

A systematic investigation on carbon and hydrogen isotopic compositions, isotope fractionations and dual isotope correlations (Δδ²H-Δδ¹³C) during different degradation processes (hydrolysis, UV/H₂O₂, direct photolysis and UV-activated persulfate oxidation) of dibutyl phthalate (DBP) was performed in this study. Significant carbon isotope enrichment and no hydrogen isotope fractionation were observed during hydrolysis. The carbon isotope enrichment factor (ε_C) was determined as (-2.7±0.4)‰. The difference between carbon and hydrogen isotope patterns indicated the C-O bond cleavage in the hydrolytic reaction without H atoms involvement. During photodegradation of DBP induced by UV/H₂O₂ and direct photolysis at different pH values (pH 2, 7 and 10), correlation Λ values of dual isotope were observed in a similar range of[(9±2)~(11±2)] and indicated similar reaction mechanism. UV-activated persulfate oxidation yielded the distinct Λ value of (31±3), which was likely associated with the C-H bond cleavage. Therefore, two-dimensional compound specific isotope analysis (2D-CSIA) highlighted the potential to discriminate three types of degradation processes (hydrolysis, photolysis and UV-activated persulfate oxidation) of DBP and to deduce degradation pathways.

Key words： dibutyl phthalate isotope fractionation photolysis potassium persulfate oxidation compound specific isotope analysis

Received: 30 December 2017

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	Articles by authors
	ZHANG Dan
	CAO Su-zhen
	DUAN Xiao-li
	YAO Jun

Cite this article:

ZHANG Dan,CAO Su-zhen,DUAN Xiao-li等. Compound specific isotope analysis of dibutyl phthalate during degradation processes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(7): 2714-2721.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I7/2714

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