印度露天采矿的回填要求和制约因素

印度的大多数采矿活动都发生在生态敏感地区．本文讨论了一项回填(即用挖出来的物质填矿井)研究计划的结果．在一些情况下,由于技术限制,回填法的使用不得不被部分或全部放弃．也有许多费用方面的考虑．制定一条国家改造采矿用地战略是最根本的策略．     

Lead monitoring in air,soil and foliar deposits at Indore city with special reference to automobile pollution

Ambient lead levels in air, soil and dust deposits on selected plant species at ten distinctly located sampling stations of Indore city are presented. The maximum lead level in air was recorded at Palasia, where the traffic density was found to be the highest. Out of the plant species studied, the maximum lead was recorded on Dalbergia sissoo leaves. A possible relationship between leaf morphology and dust accumulation tendency is also discussed.     

色楞金斯克制浆造纸厂废水和固体废物的回收利用

色楞金斯克制浆造纸厂位于距贝加尔湖60公里的色楞格河畔,年产17万吨未漂白纸浆,按照苏联政府1987年法令,该厂必须在1992年停止向色愣格河排放废水。本文讨论有助于使废水排放量减少90％（1989年减少到5000米~3/日 ）和到1992年使水全部回收利用成为可能的途径。如本文所述在色愣金斯克使用的技术,包括固体废物利用技术,是向着使该厂在生态上适合于受特别保护的贝加尔湖集水盆地前进了一大步。色楞金斯克厂西伯利亚制浆造纸工程研究所的工作人员也许能帮助有兴趣的同行发展类似的技术。     

西亚的备选水资源管理政策

即使采取方案,包括增加供应以及需求管理和保护政策,预计西亚将来还是会缺水.由于该地区的水资源非常有限,把规划、机构改革、经济手段、保护措施和实施具体项目结合起来或许可以实现长期可持续供应.     

Antimicrobial resistance among enteric bacteria, isolated from runoff of the Gangotri glacier, western Himalaya India

An attempt has been made to study antimicrobial resistance among the coliforms, faecal coliforms and faecal streptococci isolated from the runoff of the Gangotri glacier. The number of multiple antibiotic resistances (MAR) coliform isolates increases from upper stretch (33.33%) to lower stretch (83.33%). All faecal coliforms (100%) and faecal streptococci (100%) of lower stretch of study area showed multiple antibiotic resistances. Among coliforms, the value of Antibiotic resistance index (ARI) was found maximum in lower stretch (0.34) followed by middle stretch (0.29) and upper stretch (0.25).     

The Impact of the Hyperacid Ijen Crater Lake. Part I: Concentrations of Elements in Crops and Soil

In Asembagus (East Java, Indonesia) irrigation water is contaminated with effluent from the hyperacid Ijen Crater Lake resulting in a low pH and high levels of various elements. As a first step towards a risk assessment, locally produced food items (rice, maize, cassava leaf, cassava root, peanuts) were collected and concentrations of As, B, Ca, Cd, Co, Cu, Fe, Mg, Mn, Mo, Ni, Pb, V, Zn were compared to samples from a reference area and with literature values. Further, concentrations in rice were compared to total soil concentrations in paddy fields. Compared to the reference area, food items produced in the contaminated area had increased levels of Cd, Co, Ni and Mn in particular, while levels of Mo were lower. In contrast, total soil concentrations of Cd and Mn in particular have decreased whereas especially Mo was increased. In combination with the observed soil acidification, it is likely that the bioavailable concentration of most elements in the contaminated soil is higher (except for Mo) due to an increased weathering rate and/or input via the contaminated irrigation water. In terms of human health, concentrations in foods were generally within normal literature values. However, it was observed that essential elements (in particular Fe) known for their inhibitory effects on e.g. Cd and Mn toxicity did not accumulate in crops whereas Cd and Mn did.     

Effect of fenvalerate technical grade on acetyl cholinesterase activity in Indian bullfrog Haplobatrachus tigerinus (Daudin)

Indian bullfrog Haplobatrachus tigerinus (Daudin) was exposed to sublethal dose (1/3 of LC50 I.E. 1.166 mg/kg) of fenvalerate technical grade and the effect was studied on the specific activity of acetyl cholinesterase in the different tissues of frog viz., brain, muscle, liver, kidney and testis at different time periods viz., 3,6, 12, 24, 48 and 72 hours. The inhibition of specific activity of acetyl cholinesterase was in the order of kidney > brain > muscle > liver > testis. A significant inhibition was noticed in kidney at 12 hours (-64.33%) and no effect was noticed at 3 hours in testis (+0.67%). The AChE activity was inhibited in first three hours of administration of fenvalerate in all the tissue tested. The inhibition continued upto 6 hours or 2 hours in different tissue but the recovery was started by 24 hours and almost completed by 72 hours.     

Long-term temporal-spatial dynamics of marine coastal water quality in the Tolo Harbor, Hong Kong, China

IntroductionToloHarborislocatedinthenortheasternpartofHongKong .Itisanearlyland lockedwaterbodywithonlyonenarrowexittotheopenseaatMirsBay(Fig .1) .Itslengthandsurfaceareaareapproximately 15kmand 5 2km2 ,respectively .Theaveragedepthvariesfromlessthan10min…     

微地气(geogas)流——深海结核形成的一种可能机制

<正> 关于深海锰结核的形成机理已有多种看法。多数主张海水中锰和铁的无机沉淀说和火山热液沉积说。此外,还有锰在沉积物和水的接触带中的成岩富集说及生物成因说。但是,这些机理都不能解释实验观测资料的一些重要特性,故又提出了多成因说。 人们对锰结核的分布和形成已作了广泛的研究。     

13、用比较滞留指数的方法鉴定复杂混合物中的成份

概述用高分辨力的毛细管气相色谱,比较试验物质与参考物质的经过精确测定的滞留指数是一项在复杂混合物中鉴定单一成份的具有说服力的方法。精确的测定滞留指数,除需要恒定的GC参数外,还需要非常精确的测定净滞留时间。尤其在运用logt_s/同系物