摘要
通过室内培养试验研究了不同水分条件下,孕酮、雄烯二酮、17β-雌二醇、雌酮4种天然性激素在我国东北黑土中的降解情况。结果表明：4种激素在土壤中的降解符合一级动力学模型（R2=0.84~0.98,p〈0.01）,降解速率常数为0.010 0~1.004 2 d-1;4种激素在灭菌土壤中的降解半衰期均远大于未灭菌土壤,分别为未灭菌土壤的24.7、20.1、49.5和23.6倍;微生物是影响孕酮、雄烯二酮、17β-雌二醇、雌酮在黑土中降解的主要因素;4种激素在不同含水量黑土中的降解半衰期为0.69~4.92 d,孕酮和雄烯二酮的降解速率随土壤含水量升高而加快;17β-雌二醇和雌酮的降解速率随土壤湿度增加而增加,但当土壤含水量达到淹水状态时,其降解速率受到抑制。
This paper is focused on the study of the degrading char acteristics of typical sexual hormones in different soil moisture conditions based on a theory of forecasting and controlling the potential pollution of steroid hormones. The so-called natural sexual hormones re fer to a group of endocrine disrupting chemicals, which are endowed with the power to alter or disrupt the endocrine system function by mimicking. They enter the environment with sewage sludge, manure or sewage applications to agriculture soils and then become an envi ronmental concern. The so-called four types of hormones, i.e. pro gesterone, androstenedione, 17β-estradiol and estrone, should be able to incubate the black soil fertility characteristic for the different soil moisture conditions （ 15 %, 25 % and flooding） in China northeast, in hoping to expose its degradation mechanism. At the same time, we were keeping the experiment with the soil sterilization at 25 % moisture conditions in the control group. In the process of our experiments, we were trying to extract the soil samples in acetone and hormone concentrations analysis was performed by high performance liquid chromatography with an ultraviolet detector （DAD）. The resuits of our simulated experiments and analysis show that the degradation of four types of hormones turns out well in accord with the firstorder kinetics equation （R^2 = 0.84 - 0.98, p 〈 0.01） and the degradation rate constant （k） in a range of 0.010 0 - 1.004 2 d- 1 . The results also demonstrate that the four types of hormone tend to degrade much faster in non-sterilized soils than in the sterilized soils. Their half-life periods in the non-sterilized soils were 24.7, 20.1, 49.5 and 23.6 times longer than those in the sterilized soils. Thus, it can be concluded that the microorganism serves as the main influential factor affecting the degradation of the said hormones in the soil. Moreover, the half-life periods of the four different hormones in different water-content black soils prove to be 0.69 - 4.92 days. Furthermore, the degradation rates of progesterone and androstenedione prove to be increasing with the increase of the soil moisture. And, due to the said reason, the half-lives of progesterone and androstenedione in the black soil tend to be shortened from 4.92, 4.07 days to 2.37, 1.38 days with the increase of the soil water moisture from 15% to flooding. Thus, the degradation rate of 17β-estradiol and estrone proves to increase with the increase of the soil moisture from 15 % to 25 % whereas the degradation rates are bound for the flood water with the corresponding half-life periods of 2.41, 0.69, 1.82 days for 17β-estradial and 3.66, 2.94, 3.96 days for estrone, respectively.
出处
《安全与环境学报》
CAS
CSCD
北大核心
2014年第4期232-237,共6页
Journal of Safety and Environment
基金
国家自然科学基金项目(41201513)
中国博士后基金特别资助项目(2013T60149)
关键词
环境科学技术基础学科
性激素
含水量
降解
半衰期
basic disciplines of environmental science and technology
sexual hormones
water content
degradation
halflife
