Variation in Cd accumulation among radish cultivars and identification of low-Cd cultivars

Environmental Science and Pollution Research - Heavy metals have serious health consequences and ecosystem impacts. A pot experiment was conducted to investigate the variation of cadmium (Cd)...     

梵净山自然保护区基岩的天然γ辐射水平

梵净山自然保护区地表和深部２６种基岩的γ辐射值为７．４ｘ１０－８－１６．７ｘ－８ＧＹ·ｈ－１。讨论了该区基岩的γ辐射水平及分布的主要特点。     

纳氏试剂比色法测定水质中氨氮时温度对纳氏试剂的影响

文中探讨了纳氏比色法测定水质重氨氮过程中温度对纳氏试剂配制和贮存的影响，并提出了解决措施和注意事项。     

金沙江水系稀土元素环境背景值和地球化学特征

采用化学分离富集－等离子发射光谱法测定籽金沙水系江水和沉积物中１５个稀土元素（Ｌａ，Ｃｅ，Ｐｒ，Ｎｄ，Ｓｍ，Ｅｕ，Ｇｄ，Ｔｂ，Ｄｙ，Ｅｒ，Ｔｍ，Ｙｂ，Ｉｕ，Ｓｃ和Ｙ）的含量，提供了金沙江水系江水和沉积物稀土元素环境背景值，结果表明，金沙江水系稀土元素分布模式呈负斜率，肴呈负异常，水系沉积物∑Ｃｅ／∑Ｙ比值在２．５２－４．１８之间，Ｅｕ／∑ＲＥＥ比值在０．５６－０．９４之间，说明金沙江水系沉积物属贫     

物理气浮在炼油污水中的中试应用

介绍了湖南宇宙环保公司和长岭分公司联合开发的纯物理气浮工艺的机理和特点及在炼油污水中的中试情况。纯物理气浮运行稳定、产渣量少，是一种适宜在炼油污水处理推广应用的清洁工艺。     

模化城市有机垃圾的热解研究

本文简介了对城市有机垃圾(模化垃圾)进行热解的研究结果。得到了产气量、可燃气体成分、热解时间等随热解温度的变化关系。研究结果指出,当城市有机垃圾含水率W~y<50％,热解温度在900℃左右条件下,有机垃圾的潜能不仅能实现自身的处理,而且可输出部分热能。     

我国水污染物排放标准体系调整的比较探讨

从我国水污染物排放标准现状出发，分析其结构特点，剖析了现行排放标准执行过程中的若干问题，并与美国水污染物排放标准体系进行比较，提出适应我国21世纪环境管理需要的水污染物排放标准体系调整的基本设想。主要包括：水污染物排放标准建立在经济可行的技术基础上，脱离与功能区对应的关系，采用吨产品排放限值，缩小综合排放标准扩大行业排放标准，逐步按工艺、产品种类制定排放标准。     

废铁屑生产聚合硫酸铁实验研究

文章介绍了聚合硫酸铁的制备，并用不同的原料合成了几种聚合硫酸铁产品，讨论了影响产品性能的因素。同时，将它们用于给水处理和污水处理，取得了较为理想的结果。     

Photocatalytic decolorization of dispersol dyes

ＰｈｏｔｏｃａｔａｌｙｔｉｃｄｅｃｏｌｏｒｉｚａｔｉｏｎｏｆｄｉｓｐｅｒｓｏｌｄｙｅｓＹｏｕＤａｏｘｉｎ；ＤａｉＳｈｕｇｕｉ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎｔａｌＳｃｉｅｎｅｅ，ＮａｎｋａｉＵｎｉｖｅｒｓｉｔｙ，Ｔｉａｎｊｉｎ３０００７...     

Stability of alpine timberline ecotone on Taibai Mountain,China

--Landscape boundaries are always indicated by thevegetation boundaries. As an ecotone between closed forest andtreeline, alpine timberline may respond to global climate changessensitively. The stability of timberline and treeline depend notonly on climate change, but also on the interaction of both sidesof the ecosystems. Three natural boundaries existing in thetimberline transitional zone are recognized (1) timberline (upperlimit of closed forest zone); (2) treeline (upper limit of treeislands zone); (3) tree-species line (upper limit of individualtree growth). Paleobotanical and sedimentary evidences suggest thatthere were several times of climate fluctuation during the Holoceneperiod in this area. The timberline of Taibai Mountain must havemoved for four times on the millennium scale. Being a stochasticoscillation boundary, treeline appears in a semi-stable conditionon the century scale. The tree-species line is even more unstable,which appears in an unstable status on the decades scale. Thecomparison of the stability within several landscape boundaries,shed light on the sensibility of these communities to variousperturbation and environmental heterogeneity, i.e., herb community is the most sensitive one, which is followed by shrubs, and forestis the most stable one. Trees and shrubs can adapt to rocky andpoor soils. On the contrary, alpine herbs are able to adapt towetter and cooler soils. Finally, under a scenario of a temperatureof 1.5-4.5℃ increase, the present timberline will be relativelystable but treeline and tree-species line will move upward.