致癌的铬：世界上很多地方通过铬把兽皮制成皮革，铬在六价化学结构下是强烈致癌物。
CARCINOGENIC chromium: Turning hides into leather in much of the world requires chromium, which in its hexavalent chemical form is a potent carcinogen.
管理方法多样，简单的从使用骨炭吸收致癌物，然后把骨碳当作有毒废物扔掉，到高级的使用化学方法把六价铬转化成更良性的结构。
Management tactics range from using bone charcoal to soak up the carcinogen and then dispose of it as toxic waste to chemically transforming hexavalent chromium to a more benign form.
从乙烯衍生而来的一价化学基。
(化学)有五个原子价的。
在离子化合物中，正、负离子的比例严格遵守化学公式定义的化合价关系。
For ionic compounds, the state of having exactly the ratio of cations to anions specified by the chemical formula.
另外其化学指标的过氧化值和酸价与对照相比也有一定的改善。
Besides, compared with control the peroxide value and acid price of its chemical indexes also improve a little.
从磺基水杨酸与三价铁离子配合物的组成及稳定常数测定实验入手，探讨了化学实验中的教学技巧问题。
By determining the composition and stable constants of sulphuric iron salicylate, this article probes into the teaching skills in chemistry experiments.
从苯甲酸衍生而来的一价化学基。
本文提出了一个将直接电位法与化学法相结合应用于元素价态分析的方法。
In this paper, a new method has been reported which combines direct potentiometry with chemical method to analyse valence states of elements.
用原子吸收、碘价分析、BET比表面测定、XRD和IR等手段对上述催化剂以及进口催化剂进行了物理和化学表征。
Physical and chemical characterization of the catalysts as well as some import catalysts also was carried out by means of atomic spectra, activity and BET surface area measurement, XRD and IR etc.
用原子吸收、碘价分析、活性和BET比表面积测定及XRD、TG -DTA、IR等手段，对催化剂和产物进行了物理和化学表征。
Physical and chemical properties of the catalysts were studied using activity measurement, BET surface area measurement, XRD, TG DTA and IR spectra etc.
本文提出一种将传统化学滴定和图像处理技术相结合的油脂酸价检测新方法。
This paper presents a new method for oil acid value detection combining traditional chemical titration with image processing technology.
运用XPS分析方法研究一系列复合氧化物催化剂中毒前后硫在其表面的各种形态及催化剂活性组分中毒前后的组成、价态、化学机理及其变化。
By using XPS, before and after the intoxication of mixed oxide catalysts, the various appearance and the composition. valence and chemical mechanism of the active component of catalysts were studied.
煎炸油在加热过程中由于高温发生一系列的化学反应，导致煎炸油中的酸价、过氧化值、极性物质含量等指标发生变化。
Several chemical changes undergo during the frying oil heated, inducing varieties of free fatty acid content, peroxide value and the quantity of the polar components.
该系统为不含六价铬的锌铝片防腐涂料，为工业界提供了在防腐蚀、稳定摩擦系数及抗化学腐蚀领域的一个最佳选择。
Such system does not contain Chrome VI and offers the best choice for industry in corrosion protection, consistent torque-tension values and chemical resistance.
在这个模型中，认为围绕中心原子的化学键的排列取决于价层中电子对的数量。
In this model the arrangement of bonds around the central atom is considered to depend upon how many valence-shell electron pairs.
以库仑分析法为研究手段，考察了在室温下经电化学活化的石墨基二氧化铅阳极电生三价钴的条件及其应用。
It was studied that the graphite-based lead dioxide anode which had been electrochemically activated was used to electrogenerate trivalent cobalt ion by means of coulometry at ambient temperature.
利用电化学方法分别研究了晶粒尺寸对纯锌及其表面三价铬钝化膜腐蚀行为的影响。
The effects of grain size on the electrochemical corrosion behaviors of zinc and trivalent chromium passivation film on zinc have been studied respectively by electrochemical methods.
加上钪和钇，一起组成稀土金属。它们的原子都有相似的配置，以及相似的物理和化学行为，最常见的原子价是3和4。
With scandium and yttrium they make up the rare earth metals. their atoms have similar configurations and similar physical and chemical behaviour; the most common valences are3and4
(化学)具有一个以上的化合价的，或具有三价或更高价的。
(Chemistry) having more than one valence or having a valence of 3 or higher.
(化学)具有一个以上的化合价的，或具有三价或更高价的。
(Chemistry) having more than one valence or having a valence of 3 or high er.
测试表示了6价铬(一种可以导致动物得癌症的化学物质)的含量，20倍高于允许的含量。
Tests showed levels of chromium 6, a chemical that has been shown to cause cancer in laboratory animals, at 20 times the allowable limit.
使用化学方法制备pbo2可通过在溶液相或熔融状态下氧化二价铅的化合物，也可以通过在氧气中高温加热二价铅的化合物来制备。
Lead dioxide has been prepared chemically by methods in which Pb (II) compounds are oxidized to lead dioxide in the solution phase or in melts or by heating at elevated temperatures in oxygen.
采用化学镀技术在预处理后的金属表面上制备镍磷二元和镍铜磷三元镀片，用X射线光电子能谱分析仪和扫描电镜分别对镀片表面的元素价态、组成及镀片表面的形貌进行表征。
The coatings of nickel-phosphor and nickel-copper-phosphor are prepared on the pretreated metal surface by electroless plating technology. The coating surface has been characterized by XPS and SEM.
通过化学热力学平衡模拟，研究了在不同烟气温度下汞从元素态汞转化为二价汞的规律，并与小型实验结果进行了比较。
Simulations were carried out to study the effects of different compositions, such as O2, HCl, NO and SO2 on the mercury transformation.
基于凝相机理与热解实验，从分子层面和化学反应的角度，结合价键、形式电荷、链反应等理论和固体单元推进剂的燃烧状况，提出了AP与HMX间的“连锁互动”机制。
Related to bond polarity, formal charges on atoms, chain reaction theory and the comparison of solid monopropellant combustion and modeling, the "linkage mutualism"mechanism was proposed.
基于凝相机理与热解实验，从分子层面和化学反应的角度，结合价键、形式电荷、链反应等理论和固体单元推进剂的燃烧状况，提出了AP与HMX间的“连锁互动”机制。
Related to bond polarity, formal charges on atoms, chain reaction theory and the comparison of solid monopropellant combustion and modeling, the "linkage mutualism"mechanism was proposed.
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