【摘要】：以西安漢城湖為研究對(duì)象,2015年4月對(duì)湖體沉積物進(jìn)行現(xiàn)場(chǎng)調(diào)查和采樣分析,共設(shè)4個(gè)采樣點(diǎn),研究不同溫度下沉積物磷的吸附釋放特性及沉積物磷形態(tài)的分布。結(jié)果表明,沉積物磷等溫吸附隨著溫度的升高而增大,吸附特征符合修正的Langmuir模型,最大吸附容量Qmax的范圍為507.21~786.77 mg·kg~(-1)。磷動(dòng)力學(xué)吸附主要發(fā)生在實(shí)驗(yàn)進(jìn)行前12 h之內(nèi),吸附量基本達(dá)到或超過(guò)72 h吸附平衡時(shí)吸附總量的85%。磷動(dòng)力學(xué)釋放量范圍為2.02~11.058 mg·kg~(-1),且在6 h達(dá)到最大值。沉積物總磷的含量范圍為655.37~1.809.38 mg·kg~(-1),以無(wú)機(jī)磷為主,沉積物不同形態(tài)磷含量為T(mén)PIPHCl-POPNaOH-P。沉積物富營(yíng)養(yǎng)化風(fēng)險(xiǎn)指數(shù)ERI的范圍為5.92~11.86,在10℃和20℃時(shí),4個(gè)采樣點(diǎn)的ERI均在10以下,屬于低風(fēng)險(xiǎn),在30℃時(shí),4個(gè)采樣點(diǎn)的ERI均在10以上,屬于中等富營(yíng)養(yǎng)化風(fēng)險(xiǎn)。
[Abstract]:Taking the Hancheng Lake of Xi'an as the research object, a field investigation and sampling analysis of lake sediments were carried out in April 2015. Four sampling sites were set up to study the characteristics of phosphorus adsorption and release and the distribution of phosphorus forms in sediments at different temperatures. The results show that the isothermal adsorption of phosphorus increases with the increase of temperature, and the adsorption characteristics are in accordance with the modified Langmuir model. The maximum adsorption capacity of Qmax is 507.217786.77 mg kg~ (-1). The kinetic adsorption of phosphorus mainly took place within 12 hours before the experiment, and the adsorption capacity basically reached or exceeded the adsorption equilibrium at 72 h, which was 85% of the total adsorption amount. The kinetic release of phosphorus was in the range of 2.02U 11.058 mg kg~ (-1) and reached the maximum at 6 h. The content range of total phosphorus in sediment is 655.37 ~ 1.809.38 mg kg~ (-1), inorganic phosphorus is dominant, and phosphorus content in different forms of sediment is TPIPHCl-POPNaOH-P.. The range of eutrophication risk index (ERI) of sediment was 5.92 ~ 11.86. At 10 鈩，

本文編號(hào)：2315242