These oxides are released into the atmosphere and they can fall back to earth as acid rain.
这些氧化物会被排进大气，然后会以酸雨的形式降回地面。
They later fall to the Earth as acid rain, sometimes hundreds of kilometers from where they were formed.
它们以酸雨的形式降到地球上，有时离酸雨形成的地区有千里之遥。
Europium and terbium rare earth complexes with tetra carboxylic acid were successfully prepared in aqueous solution.
摘要在水溶液中合成了铕和试的四元羧酸稀土配合物。
They have found that we are causing air pollution, deforestation, acid rain, and other problems that are dangerous both to the earth and to ourselves.
他们发现，我们正在造成空气污染，森林的消失，酸雨，及其他既对地球也对我们自己有危险的问题。
A lab-scale chemical neutralizing-coagulative precipitation process was carried out to treat fluoride-rich acid wastewater in a rare earth wet refining factory.
采用实验室规模的化学混凝沉淀法处理某稀土湿法冶炼厂酸性含氟废水。
The main products are phosphoric acid, phosphates and activated beaching earth.
主要产品有磷酸，磷酸盐和激活搁浅地球。
Based on pot experiments, the effect of acid rain stress on membrane protective system of spinach and the conservation of rare earth elements were studied.
利用盆栽实验，探讨了酸雨胁迫下对菠菜膜保护酶系统的防护效应。
Trees receive fewer nutrients from the earth because it is so acid, and this creates forests that are more vulnerable to drought, disease and insect attack.
因为它是酸值很高，树木获得来自土壤的养分就会减少，森林也变得更容易受到干旱和病虫害袭击。
This article aims at summarizing the development of research on synthesis of tributyl citrate and the catalysis of sulfonic acid inorganic salt solid superacid heteropoly acid rare earth compound.
综述了磺酸、无机盐、固体超强酸、杂多酸、稀土化合物等催化体系对合成柠檬酸三丁酯的催化作用及研究进展。
The synthetic method for citric acid rare earth complex was studied in this paper. Moreover, the content of rare earth and IR of the product were measured.
研究碱式柠檬酸稀土盐的合成方法，并对产物的稀土含量、红外光谱等理化指标进行了测试。
Etherification of methanol with ethylene oxide (EO) was investigated systematically on the pillared rare earth solid acid catalyst.
全面系统地考察了在层柱稀土固体酸催化剂上甲醇和环氧乙烷醚化反应。
Eleven solid quaternary complexes of rare earth perchlorate with diphenyl sulfoxide (L) and benzoic acid (L') have been synthesized and characterized.
本文首次合成并表征了高氯酸稀土与二苯基亚砜、苯甲酸的十一种四元配合物。
Catalyzed by insoluble rare earth salts of heteropoly acid, butyl acetate have been synthesized from butanol and acetic acid.
用乙酸和正丁醇为原料，以不溶性杂多酸稀土盐为催化剂合成了乙酸丁酯。
Bifunctional organic ligand 2, 4, 6-pyridine tricarboxylic acid, water-soluble rare-earth fluorescence labeling material and preparation method thereof.
双功能有机配体2,4,6 -吡啶三甲酸、其水溶性稀土荧光标记材料及其制备方法。
Researches in and application of Lewis acid, Bronsted acid, alkali, alkaline earth and molecular sieve catalysts were described in detail.
综述了L酸与质子酸、碱（土）金属和分子筛催化剂在合成反应中的研制与应用情况，指出了分子筛催化剂是一种极具开发潜力的催化剂。
According to the chelation of citric acid and the sterically hindered effect of glycol, the vesicle of rare earth mixture can been obtained.
依据柠檬酸的螯合作用和乙二醇的空间位阻效应，获得了稀土混合物囊泡。
There are some reports about the technology for precipitating rare earth oxides directly from loaded organic phase with oxalic acid solution, but they just stop laboratory research mostly.
有关负载有机稀土草酸溶液直接沉淀工艺的研究，已见一些报道，但大都停留在实验室研究基础上。
The main factors that affect the rare earth recovery, such as concentration of rare earth and oxalic acid, acidity, temperature of the solution, and the composition of cerium and terbium are studied.
研究了料液浓度、酸度、温度、草酸浓度、铈铽配分改变对稀土收率的影响。
Synthesises rare earth complex monomer was conducted by sedimentation and direct method. The rare earth organic ionomer was synthesized by copolymerization of acrylic acid monomer.
通过沉淀法和直接法制备羧酸稀土配合物，与丙烯酸等单体共聚反应制备不同稀土含量的稀土有机高分子离聚物。
This paper presents the newest research results on rare earth element additives to chrome plating in chromic acid bath.
对稀土镀铬添加剂的最新研究成果进行了系统的介绍，并就目前应用情况，阐述了今后研究工作中需要进一步探讨的问题。
However, dendrimer catalysts are not easily synthesized and rare earth Lewis acid catalysts are easily deliquescence.
然而，树状大分子合成难度大，稀土催化剂也存在易潮解之不足。
This paper narrates the effect and the demand of titanium liquid filter aid; and introduces the use of diatom earth filter aid in the manufacture of titanium white by sulfuric acid method.
叙述了钛液助滤剂的作用及其要求，并介绍了硅藻土助滤剂在硫酸法钛白生产中的应用。
Rare earth elements in the aqueous leaching liquor of chlorinated mine mud from Sichuan West is of lower content, they can be separated by naphthenic acid extraction.
川西稀土矿泥氯化后水浸液中，稀土含量较低，可借助环烷酸萃取法分离出稀土元素。
In this paper, some advances in study on rare earth extraction chemistry are reviewed since the naphthenic acid has been used in extracting rare earth to 1990s.
本文主要综述环烷酸用作稀土元素萃取剂的萃取化学研究进展。
But even on windless days the air always smelt of something under-earth: sulphur, iron, coal, or acid.
甚至无风的时候，空气里也带着一种地窖下的什么恶味。
An easy method of rare earth separation-acid fractional crystallization was put forward.
提出了一种利用酸分离稀土的简便方法———酸分级结晶法。
Experiments showed that rare earth complexes of citric acid could improve the dye uptake and washing fastness of alginate fiber significantly.
实验表明，稀土柠檬酸络合物可以明显提高海藻酸纤维的上染百分率以及耐洗色牢度。
Experiments showed that rare earth complexes of citric acid could improve the dye uptake and washing fastness of alginate fiber significantly.
实验表明，稀土柠檬酸络合物可以明显提高海藻酸纤维的上染百分率以及耐洗色牢度。
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