Mohamed K A, Basfar A A, Al-Shahrani A A
Radiation Technology Center, Atomic Energy Research Institute, King Abdulaziz City for Science and Technology, P.O. Box 6086, Riyadh 11442, Saudi Arabia.
J Hazard Mater. 2009 Jul 30;166(2-3):810-4. doi: 10.1016/j.jhazmat.2008.11.081. Epub 2008 Dec 3.
Degradation of diazinon and atrazine pesticides present in natural groundwaters was investigated on a laboratory scale upon gamma-irradiation from a (60)Co source. The effects of pesticide type, initial concentration, characteristics of natural groundwater, potential radical scavengers and absorbed dose on efficiency of pesticide degradation were investigated using GC-MS. gamma-Irradiation experiments were carried out for three concentrations (i.e. 0.329, 1.643 and 3.286 microM/diazinon and 0.464, 2.318 and 4.636 microM/atrazine) with irradiation doses over the range 0.5-5.6 kGy for diazinon and 0.2-21 kGy for atrazine. gamma-Radiolysis showed that diazinon was much easier to degrade by ionizing radiation compared to atrazine in all natural groundwater samples. This was observed at the three initial concentrations over the range irradiation doses. The irradiation doses required for degradation of 50 and 90% diazinon (distilled water) and atrazine (humic aqueous solution) at the three concentrations were not sufficient to degrade the same concentrations in different natural groundwater samples. Moreover, the presence of naturally occurring inorganic scavengers in solutions of diazinon and atrazine decreased significantly the efficiency of radiolytic degradation of pesticides, especially at higher concentrations.
在实验室规模下，研究了天然地下水中存在的二嗪农和莠去津农药在来自钴 -60 源的伽马辐射下的降解情况。使用气相色谱 - 质谱联用仪（GC-MS）研究了农药类型、初始浓度、天然地下水特征、潜在自由基清除剂和吸收剂量对农药降解效率的影响。对二嗪农的三种浓度（即 0.329、1.643 和 3.286 微摩尔/升）和莠去津的三种浓度（即 0.464、2.318 和 4.636 微摩尔/升）进行了伽马辐射实验，二嗪农的辐照剂量范围为 0.5 - 5.6 千戈瑞，莠去津的辐照剂量范围为 0.2 - 21 千戈瑞。伽马辐射分解表明，在所有天然地下水样品中，与莠去津相比，二嗪农更容易被电离辐射降解。在三种初始浓度的整个辐照剂量范围内均观察到了这一现象。在三种浓度下，降解 50%和 90%的二嗪农（蒸馏水）和莠去津（腐殖酸水溶液）所需的辐照剂量，不足以降解不同天然地下水样品中的相同浓度。此外，二嗪农和莠去津溶液中天然存在的无机清除剂的存在显著降低了农药辐射降解的效率，尤其是在较高浓度时。
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