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Preparation of 14C-Labelled Natural Organic Matter and Tetrabromobisphenol A （TBBPA） and Their Degradation and Transformation in Soil

Author: JiangBingQi
Tutor: JiRong
School: Nanjing University
Course: Environmental Science
Keywords: (14) ~ C tracer technique (14) ~ C-DOM (14) ~ C-TBBPA Degradation Transformation Synthesis
CLC: X53
Type: Master's thesis
Year: 2011
Downloads: 101
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Abstract


Radioisotope tracer technique is to study the movement of the sample and the variation is to show changes in the level of its activities a study sample internal radioactive tracer technology. This technology capable of accurate and sensitive detection of organic compounds in environmental samples transformation and degradation. In this paper, the synthesis of labeled target organisms, soil organic matter (Soil Organic Matter, 14C-SOM), and tetrabromobisphenol A (Tetrabromobisphenol A, referred to as the 14C-TBBPA) study they study soil degradation and transformation process. Soil organic carbon is an important part of the global carbon cycle, small changes in soil carbon pool will cause significant changes in the concentration of carbon dioxide in the atmosphere, soil macrofauna on the stability of the soil carbon pool plays an important role in the decision. In this paper, the 14C-labeling technique to 14C-glucose preparation of microbial source of soil organic matter, representatives of the food soil earthworm William cavity ring earthworm (Metaphire guillelmi), 14C-SOM in two soils containing earthworms, excluding earthworms mineralization in the control soil without earthworms vermicompost residue distribution in soil and vermicompost and earthworms absorption of 14C-SOM. The results showed that the 15-day incubation period earthworms significantly accelerate the mineralization of 14C-SOM mineralization in soil without earthworm control soil mineralization 1.5-1.7 times, however, when removed from earthworms 40 days of mineralization of residual 14C-SOM in both soil than the control soil low. About 4.2-4.8% of the 14C-SOM earthworms absorption and utilization. 14C-SOM residue humin content is slightly increased, while the dissolved organic matter (DOM) of the content was significantly reduced in the presence of earthworms soil. Vermicompost without earthworms, 14C-SOM 55 days mineralization and mineralization dynamics and residual distribution were not significantly different from the control soil. These results suggest that the major impact of earthworms on microbial source 14C-SOM transformation earthworm gut role, which can be manifested in two aspects, namely the role of early mineralization of 14C-SOM as well as post of 14C-SOM residual the stabilizing effect of the substance. The follow-up should further study the role of food soil earthworms on other sources SOM degradation and transformation, to clarify the mechanism of control of earthworms on SOM stability has an important significance to reveal the laws of the global carbon cycle. 14C-phenol and acetone as raw materials, After condensation reaction, we synthesized MC-bisphenol A (Bisphenol A, BPA), 14C-tetrabromo bisphenol A, bisphenol A synthesized after the halogenation reaction, were studied using bacteria. repair TBBPA pollution of the soil, the test selection BPA degrading bacterium, Sphingomonas sp TTNP3 investigate the degradation of TBBPA aqueous solution as well as the degradation of the natural soil. The results show TTNP3 not degradation of an aqueous solution of TBBPA, can contribute to the degradation and mineralization of TBBPA in soil slurry. The the adding TTNP3 treated, TBBPA mineralization rate was significantly increased (P lt; 0.05), compared to 66.7 percent without TTNP3 treated. 20 days added the TTNP3 treated TBBPA content accounted for only 51.5% of the initial content, a decrease of 13.2% compared than plus TTNP3 processing. TBBPA both polarities different metabolites formed in the soil slurry, while the addition of the BPA degrading bacteria, the degradation rate has been improved. Polar than TBBPA weak metabolites of TBBPA was identified as monomethyl ether. A follow-up study should identify types of microbial degradation of TBBPA metabolite bioavailability and persistence in environmental media.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Soil Contamination and Control
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