查询词典 heavy metal

In order to understand the molecular mechanism of heavy metal tolerance, our work was focused on the isolation of heavy metal tolerance genes from tolerant plant Allium sativum L.

为了了解植物重金属抗性的分子机制，我们的研究主要是从重金属抗性植物材料大蒜（Allium sativum L。

Hazard analysis sheet is not updated and potential hazards are not identified in part of raw materials e.g. heavy metal, benzene hexachloride and DDT in raw materials, heavy metal and toluene diamine in inner packaging materials.

危害分析表中对部分原料的不同危害未明确识别，如原料鲜奶(化学危害：六六六/滴滴涕/黄曲霉毒素/重金属/四环素/磺胺类等)和内包材甲苯二胺/重金属

Digitaria sanguinalis Scop., Opliamenus undulatifolius Beauv. have the resistance to Mn; Cardamine flexuosa With.can accumulate the excess heavy metal of Mn. The Cinnamomun camphora seed can sprout and grow well, P. ternata Breit transportation coefficient is the highest, which have the prospect of reuse heavy metal Mn.

马唐、求米草对Mn具有抗性；碎米荠能超量积累重金属Mn；樟树种子能够萌发并很好地生长，其中半夏的转运系数最高，具有能重新利用重金属Mn的应用前景。

In order to find out completely the soil-wheat contaiminated by heavy metals in Tianjin sewage farm, we collect samples on the dry land and examinate contents of heavy metals in soil-wheat system. Firstly, the anthor evaluates that soil irrigated by sewage that has been contaminated slightly, the main polluting factors are Cd and Zn, and then the anthor evaluates soil according to different regions, soil types and irrigating water. Secondly, the anthor analyzes content and enrichment ability of heavy metals in different part of wheat, evaluates wheat is contaiminated by Cd widespreadly, only few samples polluted by Zn.Finally the anthor put up correlative analysis about heavy metal contents in the soil-wheat system, as well as plant enrichment coefficient and some physico-chemical properties of soil, and establishes a prognostic model about heavy metal content among wheat spike, soil, soil types, PH, organic matter and salinity with the quantifying theory.The prognostic accuracy of primarily contaminative factors is the best with compound correlative coefficient examining, the model can be founded.With improvement of living level, people need cleaner food.

为全面了解天津市污灌区农产品生产地土壤和旱地作物小麦的重金属污染状况，我们于2004～2005年对全市污灌区的土壤和小麦进行了采样，在对该区土壤—小麦系统中六种重金属元素(Cd、Cu、Pb、Zn、Cr和Ni)的含量进行检测的基础上，本文首先分析评价了污灌区农田土壤的环境质量总体已达到了轻度污染水平，主要的污染因子是Cd和Zn，同时对污灌区农田土壤分区县、土壤类型和不同灌水类型进行了评价；然后分析了重金属在小麦不同部位的含量与富集能力，评价了污灌区旱地作物小麦普遍遭受了Cd的污染，只有个别样点遭受了Zn的污染；最后对土壤—小麦系统重金属含量间以及植物富集系数与土壤部分理化性质间进行了相关分析，由于土壤类型是定性变量，本论文以数量化理论建立了小麦穗实中重金属含量与土壤中重金属全量、土壤类型、PH值、有机质和全盐量间的预测模型，经复相关系数检验，污灌区主要的污染因子Cd和Zn的预测精度最高，模型可以成立。

First of all, this study will be multi-walled carbon nanotubes by chemical oxidation process purified so it can be modified to deal with than the purification of purity before the modified 5 wt%, more than 1.89 times the surface area to increase the surface potential decrease of about 10 ~ 20 mV and the surface functional base (-COOH and-OH) to increase 1.45 times, and then the control technology of electroless preparation parameters include: analysis of plating time, plating analysis of temperature, metal ions in solution than the (Fe2+/ Ni2+), bath pH and the added value of dispersion Agent and other research towards Fe-Ni particles to increase the iron content and Fe-Ni particles spread in the MWCNT upper fixed targets,the results found that when the parameters for the preparation of 50 ℃, pH10, do not add dispersant, metal ions than the solution (Fe2 +/ Ni2 +) 7, the highest iron content can be Fe = 40.55 at%(flat iron content 111.17 mg / g) of nanocomposites Fe-Ni/CNT, then for a series of the nature of its analysis, the final evaluation Fe-Ni/CNT nanocomposites were processed on the effectiveness of the application of mixed pollutants, the results showed that in 120 minutes at the same time when Adsorption of heavy metal ions lead nitrate 10 ppm, selenium heavy metal ion degradation of 1 ppm and orange azo dye AO7 50 ppm standard of effluents, and after a total Fe-Ni nano-particles to SEM / EDS analysis of more than 50% still remaining.

本研究首先将多壁奈米碳管以化学氧化法做纯化改质处理能使其纯度较纯化改质前提高5 wt％、比表面积提高1.89倍、表面电位下降约10~20 mV以及表面官能基提高1.45倍，再控制无电镀技术之制备参数包括：析镀时间、析镀温度，镀液中金属离子比(Fe2+/Ni2+)、镀液pH值及是否添加分散剂等，研究朝提高Fe-Ni粒子的含铁量与Fe-Ni粒子散布固定在MWCNT上等目标进行，研究结果发现当制备参数为50 ℃、pH10、不添加分散剂、镀液金属离子比(Fe2+/Ni2+)7时，可得到最高铁含量Fe = 40.55 at％(单位铁含量111.17 mg/g)之奈米复合材料Fe-Ni/CNT，接著对其作一系列性质分析，最后评估奈米复合材料Fe-Ni/CNT对共处理混合污染物之应用效益，结果显示其在120分钟时能够同时吸附重金属硝酸铅离子10 ppm、重金属硒酸根离子1 ppm及降解偶氮橘色染料AO7 50 ppm达放流水标准，且共处理后奈米Fe-Ni粒子以SEM/EDS分析仍剩余50 %以上。

Chemometric method were used to analyze UV spectrum of TCAS-heavy metal complex, pure UV spectrum of TCAS-heavy metal complex and TCAS-heavy metal complex distribution curves toward concentration of heavy metals in solution were gained. Finally, complex constants of TCAS towards Cu, Zn, Cd and Pb were got to be 9.79、8.72、6.87 and 5.00, respectively.

采用化学计量学分析TCAS络合重金属的紫外光谱，获得了TCAS－重金属络合物的纯紫外光谱，以及TCAS、TCAS－重金属络合物随重金属浓度变化的分布曲线，并最终解析得到TCAS与Cu、Zn、Cd和Pb的络合常数分别为9.79、8.72、6.87和5.00。

At the heavy metal concentration of 3-4ppm, our study on adsorption capacity, adsorption selectivity of montmorillonite, illite and kaolinite to Cu〓、 Pb〓、 Zn〓、 Cd〓、 Cr〓 shows that the adsorption capacity is mainly determined by the capacity of exchangeable cations and the adsorption capacity of the three clay minerals decreases in this sequence: montmorillonite ＞＞ illite＞kaolinite. It is found that clay minerals have obvious adsorption selectivity to various heavy metals. Montmorillonite exhibits a stronger affinity to Cr〓 and Cu〓 while kaolinite and illite sorb Cr〓 and Pb〓 more effectively. At the same heavy metal concentration, adsorption amount of clay minerals to heavy metals increase with increasing pH value of the solution.

在痕量浓度下，研究了蒙脱石、伊利石、高岭石三种粘土矿物对Cu〓、Pb〓、Zn〓、Cd〓、Cr〓五种重金属离子的吸附容量、吸附选择性及其介质条件对吸附量的影响，结果表明，粘土矿物的阳离子交换容量越大，对重金属离子的吸附容量也越大，其大小顺序为蒙脱石＞＞伊利石＞高岭石；同时，不同粘土矿物对重金属离子具有明显的吸附选择性，蒙脱石对Cr〓和Cu〓有较好的选择性，伊利石和高岭石则对Cr〓和Pb〓有较好的选择性；随着吸附溶液pH值的增大，其吸附量有增加的趋势。

Results showed that cultivation of milk vetch significantly lowered concentrations of heavy metals and soil comprehensive pollution index, and more or less the same as the treatments of organic reagents, except for effect on decreasing Zn and Cd concentrations and comprehensive heavy metal pollution index, which were not so big in scale. When compared with the treatment of milk vetch + organic reagents, the treatment of milk vetch did not differ much in heavy metal concentrations and comprehensive pollution index. Elsholtzia splendens Nakai ex F.

结果表明，紫云英处理显著降低土壤重金属浓度和土壤综合污染指数，下降幅度与CK比呈极显著差异；除土壤Zn、Cd浓度和土壤重金属多因子综合污染指数的下降幅度显著低于有机试剂处理，其他与有机试剂处理均无显著差异；紫云英处理与&紫云英＋有机试剂&的交互作用处理相比，土壤重金属浓度和土壤综合污染指数的下降幅度无显著差异。

General analysis indicates that Myriophyllum spicatum L.Panicle shape of the absorption of chromium Cr6 + concentration and treatment exist between the concentration of significant positive correlation with Myriophyllum spicatum L.can pollute the environment in better enrichment of chromium, the background environment The higher concentration levels of heavy metals, plant accumulation of heavy metals in higher concentration levels, the application of plant technology for the repair of heavy metal pollution on the environment to provide a scientific basis on Myriophyllum spicatum L. of heavy metal pollution of wetland restoration has great potential.

综合分析表明，在一定范围内，穗状狐尾藻对铬Cr6+的吸收富集含量随处理浓度升高而增大，说明穗状狐尾藻在污染环境中能较好地富集重金属铬，从而得出在一定范围内，环境背景中重金属含量水平越高植物富集重金属的含量水平也越高的结论，这就为应用植物技术修复重金属对环境造成的污染提供科学依据，而穗状狐尾藻对湿地重金属污染具有较大的修复潜力。

Heavy metals, Pb and Cd, which were popularly accumulated in vegetables, were selected as test indexes in heavy metal passivators screening and the application effect of special fertilizer for reducing heavy metal pollution in vegetables.

无公害蔬菜生产的目的就是要求蔬菜产品中的农药、重金属、硝酸盐和亚硝酸盐含量都达到国家或省制定的蔬菜卫生标准。

But we don't care about Battlegrounds.

但我们并不在乎沙场中的显露。

Ah! don't mention it, the butcher's shop is a horror.

啊！不用提了。提到肉，真是糟透了。