Correlation between Cr^(6+) and Mn^(2+) Adsorption in Rock-soil Medium with Combined Pollution

[Objective] The aim was to study the correlation between Cr6+ and Mn2+ adsorption in rock-soil medium with combined pollution. [Method] Combining single Cr6+ and Mn2+ adsorption test with combined pollution test, the adsorption laws of Cr6+ and Mn2+ were studied, and the correlation between Cr6+ and Mn2+ adsorption was analysed by using correlation analysis and regression analysis. [Result] According to the comparative analysis on adsorption tests, the adsorption time, adsorption amount and adsorption speed of Cr6+ and Mn2+ were obviously distinct in single adsorption test and combined adsorption test. Correlation analysis revealed that there was a significantly positive correlation between Cr6+ and Mn2+, and there existed addition effects between Cr6+ and Mn2+ in regression analysis, that is, the adsorption of Cr6+ by the soil tested would be enhanced by Mn2+. [Conclusion] The research could provide scientific references for environmental control and environmental management.

Cr^(6+)、As^(3+)污染对黑藻叶细胞伤害的超微结构研究

电镜观察发现 ,黑藻 (Hydrillaverticillata(L .F .)Royle)叶细胞遭受Cr6+ 、As3 + 毒害初期 ,高尔基体消失 ,内质网膨胀后解体 ,叶绿体中的类囊体和线粒体中的脊突膨胀 ,核中染色质凝集 .随着叶细胞毒害程度的加重 ,核仁消失 ,核膜破裂 ,叶绿体和线粒体解体 ,质壁分离使胞间连丝拉断 ,最后细胞死亡 .结果表明 :Cr6+ 、As3 +

Cr^(6+)污染对菱叶中矿质元素含量的影响

研究 Cr6 +污染后菱浮水叶和沉水叶中 Cr、K、Mg、Fe、Mn、Zn、Cu、Mo元素的含量 ,结果显示 :Cr含量随培养浓度的上升而上升 ,K、Mg随培养浓度的上升而下降 ,Fe含量随培养浓度的上升而出现先上升后下降 ,Mn、Zn、Cu、Mo与 Cr6 + 的培养浓度无明显的相关关系。

废弃茶叶脱除废水中Cr^(6+)效果研究

废弃茶叶等非活性生物质脱除废水中铬具有广阔的发展前景。采用室内吸附实验方法,考察了振荡时间、铬离子初始浓度、加入茶渣量、pH及茶叶粒径等对废水铬吸附率的影响,得出废弃茶叶渣对Cr6+最佳的吸附条件。结果表明,当废水的pH为7、振荡时间为1 h时,茶叶渣对浓度为30 mg/L和50 mg/L的Cr6+溶液的吸附最佳。且废水的pH对吸附效果的影响最大,振荡时间次之。

Cr^(6+)污染对水鳖的超微结构及菱、莼菜、黑藻细胞膜的影响

Cr6+污染对水鳖超微结构的影响主要表现在 :胞间连丝呈现不同程度的断裂 ;细胞核出现各种各样的变形 ;叶绿体膨胀 ,其基粒解体。细胞损伤程度与 Cr6+ 培养浓度呈正相关。Cr6+ 对水鳖、菱、莼菜和黑藻这几种水生高等植物的细胞膜影响主要表现在 :质壁发生分离 ,质壁之间有黑色颗粒存在。在做生理验证时发现处理组的膜脂过氧化产物丙二醛 (MDA)和超氧阴离子 (O 2 )均高于对照。

Cr^(6+)对皱叶留兰香生长及生理生化的影响

[目的]为皱叶留兰香野生蔬菜生产中预报金属铬的污染及消除其毒害提供理论依据。[方法]通过水培试验,研究不同浓度的重金属Cr6(+0、5、10、50和100mg/L)对野生蔬菜皱叶留兰香生长、生理生化特性的影响。[结果]当Cr6+浓度>5mg/L时,皱叶留兰香株高、叶面积、产量及叶绿素a/b比值随着Cr6+浓度的升高而明显下降。植株体内细胞膜透性和MDA含量随着Cr6+处理浓度的增加而逐渐增大,SOD活性随Cr6+浓度增到50mg/L时上升,达到峰值后下降;POD活性随Cr6+浓度的增加而下降。SOD对铬引起氧化胁迫具有相应的适应和抵抗能力,在皱叶留兰香生长抗铬胁迫防止膜脂过氧化起着重要作用。[结论]野生蔬菜皱叶留兰香对浓度为10mg/L的Cr6+污染胁迫有较强的适应性和防御能力。

重金属Cr^(6+)污染对辣椒幼苗生理生化特性的影响

通过水培试验,研究了重金属Cr^(6+)污染对辣椒生理生化特性的影响。结果表明,低浓度的Cr^(6+)(<5mg·L^(-1))处理,地上、地下部分的干重与对照相比具有显著性差异,随着Cr^(6+)处理浓度的增大,根冠比(干重)呈现升高趋势,辣椒株高、叶绿素含量以及叶绿素a/b比值明显下降。SOD、POD是植物体内重要的两个保护酶,低浓度的Cr^(6+)对辣椒幼苗SOD的活性无明显的抑制作用,而POD活性则显著性升高;随着Cr6+处理浓度的增大,辣椒幼苗的细胞膜透性及MDA含量逐渐增大,SOD活性下降;Cr^(6+)处理浓度增大到20mg·L^(-1)时,POD活性达到峰值而后下降,暗示POD对铬胁迫具有较强的适应性,在辣椒抗铬胁迫的过程中起着重要作用。关键词:辣椒;铬污染;

铬污染土壤中Cr^(6+)的测定

通过研究土壤中的Cr6+的提取测定方法,结果表明,用0 4mol LKCl为提取剂,离心分离提取液,可简单、快速、准确地测定土壤中的Cr6+。所建立的方法适用于北方偏碱性土壤。

Fabrication of highly efficient Bi2WO6/CuS composite for visible-light photocatalytic removal of organic pollutants and Cr(VI)from wastewater

A visible-light-driven Bi_(2)WO_(6)/CuS p-n heterojunction was fabricated using an easy solvothermal method.The Bi_(2)WO_(6)/CuS exhibited high photocatalytic activity in a mixed system containing rhodamine B(RhB),tetracycline hydrochloride(TCH),and Cr(VI)under natural conditions.Approximately 98.8%of the RhB(10 mg/L),87.6%of the TCH(10 mg/L)and 95.1%of the Cr(VI)(15 mg/L)were simultaneously removed from a mixed solution within 105 min.The removal efficiencies of TCH and Cr(VI)increased by 12.9%and 20.4%,respectively,in the mixed solution,compared with the single solutions.This is mainly ascribed to the simultaneous consumption electrons and holes,which increases the amount of excited electrons/holes and enhances the separation efficiency of photogenerated electrons and holes.Bi_(2)WO_(6)/CuS can be applied over a wide pH range(2–6)with strong photocatalytic activity for RhB,TCH and Cr(VI).Coexisiting dissolved organic matter in the solution significantly promoted the removal of TCH(from 74.7%to 87.2%)and Cr(VI)(from 75.7%to 99.9%)because it accelerated the separation of electrons and holes by consuming holes as an electron acceptor.Removal mechanisms of RhB,TCH,and Cr(VI)were proposed,Bi_(2)WO_(6)/CuS was formed into a p-n heterojunction to efficiently separate and transfer photoelectrons and holes so as to drive photocatalytic reactions.Specifically,when reducing pollutants(e.g.,TCH)and oxidizing pollutants(e.g.,Cr(VI))coexist in wastewater,the p-n heterojunction in Bi_(2)WO_(6)/CuS acts as a“bridge”to shorten the electron transport and thus simultaneously increase the removal efficiencies of both types of pollutants.

铬、镉、铅胁迫对青菜叶片几种生理生化指标的影响

研究了溶液培养条件下铬、镉、铅胁迫对青菜叶片细胞膜透性、叶绿素含量和游离脯氨酸含量等的影响 .结果表明 :随着Cr6+,Cd2 +,Pb2 +处理时间的延长和处理浓度的增加 ,青菜叶片细胞膜透性显著增大 ,叶绿素a/b值逐渐降低 ,游离脯氨酸含量明显增加 ,其中游离脯氨酸含量增加的时间比细胞膜透性增大明显超前 ,而叶绿素a/b值降低的时间在这 3种重金属中未见明显的规律性 .图 4表 1参 2

南水北调中线焦作典型区浅层地下水污染特征

南水北调中线焦作典型区浅层地下水污染的研究对确保南水北调工程供水水质安全具有重大的意义。通过现场调查以及水质分析,结果表明:研究区浅层地下水六价铬、硝酸盐、硫酸盐、硬度、溶解性总固体(TDS)以及大肠杆菌污染严重。研究区浅层地下水铬污染的污染源是焦作某电厂的灰场,该灰场粉煤灰中含有大量的重金属铬。工矿业污水灌溉农田是浅层地下水硝酸盐、硫酸盐、硬度、TDS以及大肠杆菌污染的主要影响因素。

不同类型岩土对六价铬的抗污染性分析

对已经受铬污染的、未受铬污染的以及受造纸厂废水污染的不同岩土样,分别用蒸馏水和铬污染水作为淋液进行淋滤试验。受铬污染的岩土会发生二次溶解,导致淋滤液受Cr6+污染。受造纸废液污染的土样对污染水中的Cr6+具有较强的吸附截留作用,其去除Cr6+效果远优于一般岩土,即对Cr6+的抗污染性较好。

模拟矿井水中部分离子对蚕豆遗传性损伤的研究

用矿井水作蚕豆微核实验,讨论了F-、Hg2+和Cr6+单一及复合污染对蚕豆微核的影响。结果表明,F-、Hg2+和Cr6+单一污染均对微核产生显著影响,随着氟化物浓度和Cr6+浓度的增加,微核率呈上升趋势;随着Hg2+和Cr6+浓度增加,微核率呈先上升后下降的趋势。两因子方差分析显示,F-和Hg2+复合污染对蚕豆微核率有显著影响。

含铬电镀废水处理技术

对电镀含铬废水进行电解作用 ,使 Cr6 +变为氢氧化铬沉淀 ,沉淀物被填料吸附、过滤后统一处理 ,清水回用 。

铬渣在济钢120m^2烧结机生产上的应用

介绍济钢120m2烧结机消化济南裕兴化工厂含Cr6+铬渣的生产情况,重点是使用铬渣进行的工艺改造和效果,达到消化铬渣的同时不产生二次污染,即消除污染,又造福社会。