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INFORMATION ON DOCTORAL THESIS
1. Full name: Ngo Thi Lan Phuong 2. Sex: Female
3. Date of birth: March 30, 1975 4. Place of birth: Hanoi, Vietnam
5. Admission decision number: 290/SĐH Dated November 22, 2005
6. Changes in academic process: Extended 12 months decision number 2114/QĐ-SĐH dated October 28, 2008.
7. Official thesis title: Evaluation of pollution status and contaminating capacity of some heavy metals in vegetable cultivation outskirt areas of Hanoi
8. Major: Soil and Water Environment 9. Code: 62 85 02 05
10. Supervisors: Trinh Thi Thanh, Assoc. Prof. Dr.
Nguyen Xuan Hai, Assoc. Prof. Dr. Sc.
11. Summary of the new findings of the thesis:
Contamination status ofsubmerged soil, irrigating water and vegetable produces by some heavy metals are investigated. In addition, the contents of these metals in differents oxidation states are carried out by using advanced methods. Moreover, the abilities of these metals to mobilize in irrigating water as well as the obsorption and of these metals by plants are studied. Also, the accumulation levels of the studied metals by heavy metals contaminated irrigating water are stimulated. Finally, the thesis provides an overview on where contamination of heavy metals originated by using Minitab software.
Contamination of heavy metals in soil, water and vegetables of four vegetable-grown areas of suburbs of Hanoi is still within the guidelines (with the exceptions of several contaminated samples). The above mentioned results lead us to a conclusion that there is a tendency of a decrease in the environmental qualities indicating by an incease in the concentrations of heavy metals.
The obtained results shows that although the water used for irrigation is still within the required standards, there are possibilities that the soil environment can be contaminated with heavy metals. This is due to the fact that concentrations of heavy metals in total solid resudue of the investigated water samples are relatively high, especially high in concentrations of Zn, Fe, Cu, Pb, Mn, Hg and As (dissolved contaminations make up less than 40% total contamination). The concentrations of mobile heavy metals in soil and submerged soil are very low compared to the total values (< 2%). That is why there are symptoms of contamination detected in the investigated samples but in fact the vegetable samples studied are not found heavily contaminated.
The abilities to accumulate heavy metals of each type by vegetables are different from each other and different in each part of the vegetable.
The contamination of heavy metals in soil according to the ratio between the augmentation per year and the current content is in the following order: Co < Ni < Fe < Cr < Mn < Cd < Cu < Zn < Pb < Hg < As.
12. Practical applicability:
Research results about contamination of heavy metal in water, soil, sediment and vegetable are precious material for environmental protection in vegetable cultivation outskirt areas of Hanoi.
13. Further research direction:
Studies speciations of heavy metals in water and soil environment.
14. Thesis-related publications:
[1] Ngo Thi Lan Phuong (2007), “The affect of water and soil environment to vegetable quality”, Vietnam Journal of Agriculture and Rural Development, (17), 15-20.
[2] Le Nhu Thanh, Pham Quoc Dung, Ngo Thi Lan Phuong, Le Thi Kieu Nhi (2008), “Using solid-Phase Extraction and Atomic Absorption Spectrometry technique for separation and determination of cadmium”, Journal of Analytical Sciences, 2 (13), 72-75.
[3] Nguyen Xuan Hai, Ngo Thi Lan Phuong (2009), “Study on accumulation of heavy metals in soil and irrigation water at outskirts area of Hanoi city”, Vietnam Journal of Agriculture and Rural Development, (9), 26-31.
[4] Trinh Thi Thanh, Ngo Thi Lan Phuong (2010), “Assessment of distribution and sources of heavy metals in water environment at outskirts area of Hanoi city”, Natural resources and Environment Magazine, (2), 52-56.
[5] Nguyen Xuan Hai, Ngo Thi Lan Phuong (2010), “Assessment of distribution, sources of heavy metals in soil and sediment at outskirt area of Hanoi City”, Vietnam Journal of Agriculture and Rural Development, (2), 23-29.
March 24, 2010
Ngo Thi Lan Phuong
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