DESORPTION BEHAVIOR OF PHENANTHRENE AND PYRENE IN ROCKY DESERTIFICATION SOIL IN GUIZHOU, CHINA

LI Wei; AN Xian-jin

doi:10.13205/j.hjgc.202209024

Volume 40 Issue 9

Nov. 2022

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LI Wei, AN Xian-jin. DESORPTION BEHAVIOR OF PHENANTHRENE AND PYRENE IN ROCKY DESERTIFICATION SOIL IN GUIZHOU, CHINA[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 178-185,214. doi: 10.13205/j.hjgc.202209024

Citation:

LI Wei, AN Xian-jin. DESORPTION BEHAVIOR OF PHENANTHRENE AND PYRENE IN ROCKY DESERTIFICATION SOIL IN GUIZHOU, CHINA[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(9): 178-185,214. doi: 10.13205/j.hjgc.202209024

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DESORPTION BEHAVIOR OF PHENANTHRENE AND PYRENE IN ROCKY DESERTIFICATION SOIL IN GUIZHOU, CHINA

doi: 10.13205/j.hjgc.202209024

LI Wei¹,
AN Xian-jin^{2,3
,
,}

1. College of Biology and Environmental Engineering, Guiyang University, Guiyang 550005, China;
2. Guizhou Normal University, Guiyang 550001, China;
3. National Karst Rock Desert Control Engineering Technology Research Center, Guiyang 550001, China

Received Date: 2022-05-13
Available Online: 2022-11-09

Abstract

Abstract

Study of typical polycyclic aromatic hydrocarbons(PAHs) in rocky desertification soil and the physicochemical properties of rocky desertification soil effect on the migration mechanism of PAHs, typical lime soil in the different rocky desertification areas in Guizhou was carried out. Phenanthrene and pyrene were selected as the subjects, and batch desorption method combined with Pearson correlation analysis was used to study the desorption behavior of these two pollutants in different solutions. The results showed that the higher the rocky desertification grades, the easier the desorption of phenanthrene and pyrene, with the desorption hysteresis coefficient(HI) of phenanthrene and pyrene decreased from 0.73 and 0.46 for non-rocky desertification, to 0.54 and 0.28 for strong rocky desertification, respectively. The nonlinear index(N) of phenanthrene and pyrene was increased from 0.514 and 0.557 for non-rocky desertification, to 0.606 and 0.637 for strong rocky desertification, respectively. The results of desorption kinetic showed that as the rocky desertification grade increased, the fast desorption fraction(F_rap) of phenanthrene and pyrene was increased and the amplification was 24.14% and 18.14%, respectively; the fast desorption rate(K_rap) of phenanthrene and pyrene was increased from 6.56 and 1.26 h^-1 to 8.16 and 7.98 h^-1, respectively. The four primary parameters affecting the desorption of phenanthrene and pyrene in rocky desertification grades soil in Guizhou province were soil organic matter content, degree of porosity, specific surface area and cation exchange capacity, which were all negatively correlated with the desorption capacity of phenanthrene and pyrene in rocky desertification soil. The abundant calcium in rocky desertification soil was also an essential factor in the effect of phenanthrene and pyrene desorption, and in the electrolyte solution, Ca²⁺ enhanced the desorption of phenanthrene and pyrene compared to trials under different desorption conditions. The study found that phenanthrene and pyrene desorption were easier in soil with higher rocky desertification grade, which was closely related to the calcium-rich properties of the soil.
- desertification,
- soil,
- phenanthrene,
- pyrene,
- desorption

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References(38)

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