五价砷

结果表明；Freundlich方程、Langmuir方程和Temkin方程对五价砷的吸附解吸的模拟，均达到了极显著水平，其中尤以Freundlich方程和Langmuir－（3）方程最佳；

The results suggest that the equations of Freundlich , Langmuir , and Temkin can be used to describe the arsenate adsorption and desorption , and reach the most significant level by statistical examination , especially the equations of Freundlich and Langmuir - ( 3 ) are optimum .

研究四川六大类紫色土对五价砷的吸附解吸及其数学模拟，并采用灰色系统的关联度方法，力图使吸附解吸参数与土壤性质联系起来。

The arsenate adsorption and desorption in six types of purple soil were investigated , and the analytical method of the correlation degree of the grey system was used to relate them with the soil properties .

三价砷和五价砷的吸附等温线对Langmuir和Freundlich模型都有良好的相关性。

The adsorption isotherm of arsenate and arsenite fits Langmuir and Freundlich adsorption isotherm model well .

在利用硫酸铁去除五价砷[As（V）]的基础上研究了三价砷[As（III）]的氧化及去除，以寻求适合于分散式饮水中As（III）的氧化方法。

The feasible methods for oxidation and removal of arsenite [ As (ⅲ) ] from dispersed drinking water were based on the removal of arsenate [ As ( V ) ] by ferric sulfate .

然后研究所制备的改性沸石球对水中五价砷的去除效果，详细考察了沸石投加量、处理液浓度、沸石粒度、温度、时间、pH等因素对砷（V）去除的影响规律；

Then , the removal efficiency of arsenic ( V ) by zeolite pellets and the factors influencing the efficiency , as pellet size , zeolite amout , treating time , pH and temperature , etc. were investigated thoroughly .

混凝去除五价砷中试研究及絮体回流的强化效果

Pilot Study on Pentavalent Arsenic Removal by Coagulation and the Strengthening Effect of Flocs Recycling

其中三价砷比五价砷毒性更强、更不稳定、更不容易去除。

And trivalent arsenic has stronger toxicity , more stability and more difficult to remove than pentavalent arsenic .

并且，三价砷在自然状态下氧化成五价砷的速度较慢。

Moreover , trivalent arsenic in the natural environment oxidized to pentavalent arsenic is a very slow process .

考察了不同的紫外光照射情况对三价砷和五价砷吸附机理的影响。

And try to find the different effect of different UV irradiation conditions on arsenate and arsenite adsorption mechanism .

因此，在除砷前将三价氧化成为五价砷是强化除砷的有效途径。

Therefore , it is an effective way to oxidized trivalent arsenic to pentavalent arsenic when we remove arsenic in the water .

结论因进入体内的五价砷可以还原成三价，对工业生产中接触的五价砷的致癌危险性不容忽视。

Conclusion Seems that as the pentavalent arsenic can be reduced to trivalent arsenic in human body , it should not ignore the risk of exposure to pentavalent arsenic in working environment .

本论文的目的：首先建立一种快速测定水中三价砷和五价砷的方法；其次合成一种负载型Mn/TiO2光催化剂和吸附剂，并将其应用于砷的处理体系中。

The first purpose of this paper is to establish a rapid determination of trivalent arsenic and pentavalent arsenic method in water , secondly , to synthesize loaded Mn / TiO2photocatalyst and adsorbent and apply it to the arsenic treatment system .