hexavalent

简明释义

英[ˌheksəˈveɪlənt]美[ˌheksəˈveɪlənt]

adj. [化学] 六价的（sexivalent）

英英释义

单词用法

同义词

反义词

例句

1.In general, hardened fly ashes compacted at the optimum moisture content are with higher hexavalent chromium leachability than hardened fly ash slurry.

一般来说，干硬击实粉煤灰硬化体中六价铬离子的溶出量较泥浆硬化体的高。

2.This study can provide some academic references for the treatment of wastewater containing hexavalent chromium.

本研究对于花生壳处理低浓度含铬废水具有理论参考价值。

3.This study discussed the effect of applied voltage on the removal efficiency and electrical energy consumption of electrokinetic remediation kaolin polluted by hexavalent chromium at laboratory scale.

采用电动修复装置进行试验，研究了污染高岭土电动修复过程中不同电压对修复效率和电能消耗的影响，探讨了其经济有效的电压范围。

4.The research development of microbial reduction of hexavalent chromium in wastewater is described.

本文综述了微生物还原处理含六价铬的废水的研究进展。

5.This experiment mainly investigates several aspects as follows:the effects and mechanism of removing hexavalent chromium using ion-exchange;

实验中主要研究以下几点：离子交换对六价铬的去除效果和机理；

6.Hexavalent chromium plating has weaknesses such as toxicity and environmental pollution.

六价铬电镀具有毒性大、环境污染严重等缺点。

7.This study discussed the effect of applied voltage on the removal efficiency and electrical energy consumption of electrokinetic remediation kaolin polluted by hexavalent chromium at laboratory scale.

采用电动修复装置进行试验，研究了污染高岭土电动修复过程中不同电压对修复效率和电能消耗的影响，探讨了其经济有效的电压范围。

8.The toxicity of chromium is related to its oxidation states, and the primary typical pollutant in chromium-containing electroplating waste water is hexavalent chromium.

铬的毒性与其存在状态有关，六价铬是电镀含铬废水中的主要特征污染物。

9.All the ROHS standards, in conformity with the plating line with general international environmental standards, lead, cadmium, mercury, hexavalent chromium not to exceed bid.

所有镀种符合ROHS标准，符合国际通用环保标准，铅、镉、汞、六价铬不超标。

10.Workers must wear protective gear when handling materials that contain hexavalent 六价 chromium.

工人在处理含有六价铬的材料时必须穿戴防护装备。

11.The contamination of water sources with hexavalent 六价 chromium is a significant environmental concern.

水源被六价铬污染是一个重大环境问题。

12.The study focused on the health effects of hexavalent 六价 chromium exposure among factory workers.

该研究集中于工人接触六价铬的健康影响。

13.Regulations have been established to limit the release of hexavalent 六价 chromium into the environment.

已制定法规以限制六价铬的释放到环境中。

14.Testing for hexavalent 六价 chromium is essential in assessing soil contamination levels.

检测六价铬对于评估土壤污染水平至关重要。

作文

The term hexavalent refers to a chemical species that has a valence of six, meaning it can form six bonds with other atoms. This concept is crucial in the field of chemistry, particularly when discussing certain elements and their compounds. One of the most notable examples of a hexavalent element is chromium. In its hexavalent state, chromium is found in various compounds, including chromates and dichromates, which are widely used in industrial applications. However, while these compounds have practical uses, they also pose significant health risks. Chromium(VI), or hexavalent chromium, is known to be highly toxic and carcinogenic. Exposure to hexavalent chromium can occur through inhalation, ingestion, or skin contact, leading to severe health issues such as lung cancer, kidney damage, and skin ulcers. This has raised considerable concerns regarding occupational safety and environmental pollution. Industries that utilize hexavalent chromium must implement stringent safety measures to protect workers and surrounding communities from its harmful effects.In contrast, chromium(III), or trivalent chromium, is considered less harmful and is even an essential nutrient for humans in trace amounts. This difference highlights the importance of understanding the oxidation states of elements, particularly those that exhibit multiple valences like chromium. The transition between hexavalent and trivalent states can occur through various chemical reactions, often involving reduction processes that convert the more toxic form into a less harmful one.Moreover, the study of hexavalent compounds extends beyond chromium. Other elements, such as molybdenum and tungsten, can also exist in a hexavalent state. Research on these elements is ongoing, as scientists seek to understand their properties, potential applications, and environmental impacts. For instance, hexavalent molybdenum compounds are being investigated for their use in catalysis and materials science.Understanding the implications of hexavalent species is not only vital for chemists but also for policymakers and environmentalists. As regulations surrounding hazardous substances become stricter, industries must adapt by finding safer alternatives to hexavalent compounds or developing technologies to mitigate their risks. For example, some companies are exploring the use of bioremediation techniques to clean up sites contaminated with hexavalent chromium, utilizing microorganisms that can reduce it to the less toxic trivalent form.In conclusion, the concept of hexavalent is a significant aspect of chemistry with far-reaching implications in health, safety, and environmental science. As we continue to study and understand the behavior of hexavalent compounds, it becomes increasingly clear that responsible management of these substances is essential for protecting human health and the environment. The ongoing research and development in this area will play a critical role in ensuring that the benefits of hexavalent compounds can be harnessed safely and sustainably.

“六价”一词指的是具有六价的化学物种，意味着它可以与其他原子形成六个键。这个概念在化学领域中至关重要，特别是在讨论某些元素及其化合物时。一个最显著的例子是铬。在其六价状态下，铬存在于各种化合物中，包括铬酸盐和重铬酸盐，这些化合物被广泛应用于工业。然而，尽管这些化合物具有实际用途，但它们也带来了显著的健康风险。铬（VI），或六价铬，已知是高度毒性和致癌性的。接触六价铬可能通过吸入、摄入或皮肤接触发生，导致严重的健康问题，如肺癌、肾损伤和皮肤溃疡。这引发了关于职业安全和环境污染的重大关切。使用六价铬的行业必须实施严格的安全措施，以保护工人和周围社区免受其有害影响。相比之下，铬（III）或三价铬被认为危害较小，甚至在微量上是人体必需的营养素。这种差异突显了理解元素氧化态的重要性，特别是那些表现出多种价态的元素，如铬。六价和三价状态之间的转变可以通过各种化学反应发生，通常涉及将更具毒性的形式转化为较无害的形式的还原过程。此外，六价化合物的研究不仅限于铬。其他元素，如钼和钨，也可以以六价状态存在。对这些元素的研究正在进行中，科学家们试图理解它们的性质、潜在应用和环境影响。例如，六价钼化合物正在被研究用于催化和材料科学。理解六价物种的含义不仅对化学家至关重要，对政策制定者和环境保护主义者也是如此。随着对危险物质的法规变得越来越严格，行业必须通过寻找更安全的替代品或开发技术来减轻其风险来适应。例如，一些公司正在探索生物修复技术，以清理受到六价铬污染的场所，利用能够将其还原为较无毒的三价形式的微生物。总之，六价的概念是化学中的一个重要方面，对健康、安全和环境科学有着深远的影响。随着我们继续研究和理解六价化合物的行为，越来越清楚的是，对这些物质的负责任管理对于保护人类健康和环境至关重要。在这一领域的持续研究和发展将在确保安全和可持续地利用六价化合物的好处方面发挥关键作用。