天然沸石吸附氨氮和磷的研究

选用浙江缙云产颗粒状天然沸石为材料对氨氮和磷进行吸附动力学和吸附等温试验,考察初始浓度、振荡时间对吸附量、去除率的影响。试验结果表明：沸石对氨氮和磷吸附显示出＂快速吸附,缓慢平衡＂的特点;吸附动力学过程符合准二级动力学模型;吸附等温线更符合Freundlich方程;氨氮初始浓度小于7 mg/L、振荡时间在1h内和磷初始浓度小于30 mg/L、振荡时间在15 min内,吸附量、去除率随初始浓度、振荡时间增加而增加,当超过此阶段后,吸附量增加缓慢、去除率下降。     

居室花卉对室内空气污染的正负效应

人们很早就意识到室内养花能调解室内空气。近年来随着室内空气污染问题的日益凸显,加之人们对环境质量与健康水平的日益关注,原本作为室内装饰用的花卉被赋予新的使命而大量搬进居室。居室花卉对室内空气污染具有一定的消除作用,但同时我们也要看到其对室内空气的污染效应。本文分别论述了居室花卉对室内空气污染的消除作用和污染效应;最后指出要以科学的态度和方法看待居室花卉在室内空气污染中的作用。     

兼氧接触工艺处理纺织印染废水的生产性试验

采用兼氧接触工艺处理纺织印染废水,该工艺具有电耗低,耐受高ｐＨ值冲击,降低ｐＨ值,降解部分有限物,提高废水可生化性的作用,生产装置进水ｐＨ８．８－１２．５,ＣＯＤ１２６６．９ｍｇ／Ｌ,兼氧接触处理出水ｐＨ７．６－１０．１ＣＯＤ８９４．０ｍｇ／Ｌ,ＣＯＤ去除率２９．４％,出水经后续好氧处理,达到ＧＢ８９７８－８８二级新扩改排放标准。     

东莞市景观生态演化特征的分析

利用多时相遥感手段,对东莞市的景观演化特征进行了回顾性分析,重点研究不同景观要素从1986～1994年的变化情况,探讨景观结构和功能变化与东莞市社会经济发展之间的对应关系。研究表明,高强度土地资源开发利用是东莞市景观变化的直接驱动因素,生物过程在景观动态变化过程中,居于次要地位;景观演化的基本格局是城市要素迅速膨胀,农业和自然要素则不断减少;由于缺乏必要的景观结构和功能的相互适应设计,在东莞市景观演化过程中,存在一些潜在的生态问题。初步探讨了东莞市景观生态保护的基本途径     

灰色模型在环境评价中的应用

探讨了灰色系统理论在环境评价中的应用,并且以某区地下水体中NO3^--N含量的观测资料为例建立了灰色预测模型。将预测计算结果与实际数据进行比较,结果表明,灰色预测模型对于波形特点的污染元素含量预测,其效果是比较好的。     

北京市燕山地区大气颗粒物中NO3－和SO42－浓度变化规律及其与O3

用ＫＢ－１２０型大气颗粒采样器采样,离子色谱法分析其中水溶性无机阴离子组分。结果表明,北京市燕山石油化工区大气颗粒物中和浓度随季节变化显著,夏季和平均浓度分别为９．４０μｇ／ｍ３和２８．２２μｇ／ｍ３;秋季分别为４．１２μｇ／ｍ３和３．８０μｇ／ｍ３。     

张八岭变质地体细碧石英角斑岩系岩石学和岩石化学

本文在1／5万张八岭幅、珠龙幅区调工作基础上．结合邻区有关资料．从张八岭变质地体的细碧－石英角斑岩系的岩石学、岩石化学及地球化学特征．讨论了细碧－石英角斑岩系的变质作用、岩石化学、原岩建造特点及其原始构造环境。     

管店岩体岩石谱系单位划分及其就位机制探讨

本文从宏观（结构、构造、接触关系）微观（岩石化学、微量元素、稀土元素、副矿物）对比出发，按国际地层指南的将课成岩体“属于地层学和地层划分的范畴”的思路，将管店岩体划分成石马凹单元、南封单元、小寺王单元和祝刘单元四个单元,合并成管店超单元。并对岩浆受构造应力驱使由南向北挤侵就位证据进行了探讨。     

Disruption of iron homeostasis and resultant health effects upon exposure to various environmental pollutants: A critical review

Environmental pollution has become one of the greatest problems in the world, and the concerns about environmental pollutants released by human activities from agriculture and industrial production have been continuously increasing. Although intense efforts have been made to understand the health effects of environmental pollutants, most studies have only focused on direct toxic effects and failed to simultaneously evaluate the long-term adaptive, compensatory and secondary impacts on health. Burgeoning evidence suggests that environmental pollutants may directly or indirectly give rise to disordered element homeostasis, such as for iron. It is crucially important to maintain concerted cellular and systemic iron metabolism. Otherwise, disordered iron metabolism would lead to cytotoxicity and increased risk for various diseases, including cancers. Thus, study on the effects of environmental pollutants upon iron homeostasis is urgently needed. In this review, we recapitulate the available findings on the direct or indirect impacts of environmental pollutants, including persistent organic pollutants (POPs), heavy metals and pesticides, on iron homeostasis and associated adverse health problems. In view of the unanswered questions, more efforts are warranted to investigate the disruptive effects of environmental pollutants on iron homeostasis and consequent toxicities.