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Influence of Physical-Chemical Properties and Temperature on Soil/Air Partition Coefficient of Selected Compounds

Author: HeXin
Tutor: QuanZuo
School: Dalian University of Technology
Course: Environmental Engineering
Keywords: Soil / air partition coefficient (KSA) Octanol / air partition coefficient (KOA) Temperature dependence Oil / gas partition coefficients
CLC: X131.3
Type: PhD thesis
Year: 2009
Downloads: 202
Quote: 0
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Abstract


The Northeast region is China's important industrial base and grain production bases, industrial pollution and pesticide contamination is more serious. The area is also China's major oil-producing region, three major oil fields of Daqing, Liaohe and Jilin oil is inevitable in the process of mining, transportation and other contaminated soils. The northeast region is higher latitudes, the long winter, generally from November to February, the average temperature is lower, the minimum temperature of -35 ℃. This paper studies the northeast of contaminated soil, volatile (VOCs), semi-volatile organic contaminants (SOCs) in the soil when the low temperature and oil combined pollution / gas partition behavior. Specifically to carry out the following research: (1) the method of batch experiments to trichlorethylene (TCE), measured TCE in soil organic carbon content (loess, paddy soil and black soil), a variety of temperatures ( -14-20 ℃) ??soil / air partition coefficient (K SA ). The TCE K SA increases with the increase in soil organic carbon content, the lower the temperature. At low temperatures, even if it is extremely volatile TCE can also tends to be assigned to the soil (-14 ° C, K SA = 10 3 ). (2) In order to further study the compounds in the low temperature behavior of the soil / gas partition using solid phase Yat meter to semi-volatile Aroclor1242 for target determination of 66 kinds of polychlorinated biphenyls (PCBs) (of which 27 species chromatography on Total effluent), in the range of -30-30 ℃ temperature of 15 K SA , the cross nearly 6.5 magnitude range 10 4.4 - 10 11 . Temperature ≥ 0 ℃ and temperature ≤ 0 ℃ of PCBs log K SA and the reciprocal of the absolute temperature showed a linear relationship between the slope between 3.82-5.61 and 5.58-6.88, respectively. Description of PCBs log K SA decreasing temperature significantly increases, while at a temperature of LT; 0 ° C, this tendency to increase more significantly. Experimental determination of log K SA corresponding the log K OA, linear regression slope close to 1, indicating the nature of the distribution of PCBs in the soil and their in octanol The allocation of a similar nature. Improved Karickhoff equation was used to predict the allocation of PCBs in the experimental soil (temperature ≥ 0 ℃ and temperature ≤ 0 ° C). (3) In order to further extend the low temperature SOCs K SA data, determination of polycyclic aromatic hydrocarbons (phenanthrene and fluoranthene) and organochlorine pesticides (α-BHC, γ - HCH, cis-chlordane, o, p'-DDE, trans-chlordane and trans-nonachlor) within the temperature range of -30-30 ℃ K SA to obtain 113 data, the range of 10 4.5 -10 10.4 . The same results as the PCBs, at a temperature of ≥ 0 ℃ and temperature ≤ 0 ℃, these substances log of K SA and the reciprocal of the absolute temperature showed a linear relationship. Temperature ≥ 0 ° C, when the temperature ≤ 0 ° C of PAHs and OCs slope between 5.51-6.10 and 6.23-9.68, respectively, of PAHs and OCs slope of 4.11-4.84 and 4.75-5.65, respectively; OCs in each test temperature log K SA and log K OA , the linear regression slope of an average of 0.6. Further studies have shown that that the Karickhoff equation can only be broadly estimate the the OCs in experimental soil of K SA 20 ° C, the predictive value is measured 19 times (trans-nonachlor). (4) combined with the characteristics of the oil pollution of the northeastern region, the effects of oil - hexachlorobenzene (HCB) composite contaminated soil, different oil concentration and temperature (-30-30 ℃) HCB K SA . Come to inspect oil concentration impact experiments: 20 ℃ when the the Panjin crude critical separate phase concentration (CSPC) is approximately 1000 mg kg soil organic carbon content of 1% -1 when greater than this value, the oil phase is present in the soil. In temperature influence drawn: the oil-contaminated soil, oil is related to the performance of the change with temperature of the soil adsorption (allocation), the same oil pollution of soil load, high temperature, the oil tends to enhance the adsorption of the soil as a whole (allocation) capability and compared with natural soil organic carbon, oil is an adsorption (distribution) are strong matrix, 30 ℃ 5 times of natural soil organic carbon. In summary, this study in the wider environment within the temperature range investigated the behavior of some organic pollutants in soil / gas partition. Reveal a low temperature (≤ 0 ℃), the compound soil / gas partition behavior particularity. Preliminary study of the residual oil in the soil of the other compounds in soil / gas partition behavior. This thesis is to fill the blank of the distribution of data in the low temperature and deepen people's understanding of the environmental behavior of the compounds in the low temperature and oil contaminated soil.

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CLC: > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Chemistry > Environmental pollution, chemical > Soil pollution chemistry
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