活性氧化铝对溶液中氟离子的吸附研究

一、前言对于含氟废水,目前常采用混凝沉淀法处理,但较难达标。由于活性氧化铝对氟表现出很强的吸附能力,因而可用于含氟废水的后级净化处理。有关以活性氧化铝作为载体,浸渍金属盐溶液制备催化剂,国内外已有大量的研究成果,但用以去除溶液中氟离子吸附研究的报道,则不多见。本文研究了氟离子的吸附等温线、溶液pH值、氧化铝粒径以及SO_4^(2-)、PO_4^(3-)、Fe^(3+)等离子与氟离子共存时对吸附的影响,并对吸附机理进行了探讨。二、实验部分 (一)仪器与试剂用HDF氟离子选择性电极、232饱和甘汞电极和PHS-2型精密酸度计,测定溶液中氟离子浓度。总离子强度调节缓冲剂(TISAB),按文献[2]配制。

Response of SOD Activity of Earthworm to Soil Plumbum Pollution

The response of the superoxide dismutase （SOD） activities of earthworm （Eisenia fetida） to soil plumbum （Pb） pol ution was studied in the artificial soil test. The results indicated that the SOD activity in earthworm exposed to low-concentra-tion Pb declined on the 5th day of acute toxicity test, while that exposed to high-concentration Pb increased by different extents. On the 15th day, the SOD activity increased slightly along with soil Pb concentration increasing.