gravimetric analysis

简明释义

重量分析

英英释义

例句

1.The results of the gravimetric analysis showed a high concentration of lead in the water sample.

这次重力分析的结果显示水样中铅的浓度很高。

2.To ensure accuracy, the gravimetric analysis was repeated multiple times.

为了确保准确性，重力分析重复进行了多次。

3.We used gravimetric analysis to measure the purity of the compound.

我们使用重力分析来测量化合物的纯度。

4.The laboratory technician explained how gravimetric analysis can be used to quantify substances.

实验室技术员解释了如何使用重力分析来定量物质。

5.In the chemistry lab, we performed gravimetric analysis to determine the amount of chloride in the sample.

在化学实验室，我们进行了重力分析以确定样品中氯的含量。

作文

Gravimetric analysis is a method of quantitative chemical analysis in which the mass of an analyte is determined. This technique is widely used in laboratories for its high accuracy and reliability. The fundamental principle behind gravimetric analysis (重量分析) is based on the measurement of mass. By converting the analyte into a stable, pure compound, chemists can accurately weigh the substance and calculate its concentration in the original sample. The process typically begins with the preparation of the sample. The sample is dissolved in a suitable solvent, and any impurities are removed through filtration or other purification methods. Once the solution is clear, a precipitating agent is added to form a solid compound with the analyte. This solid is known as a precipitate. The choice of precipitating agent is crucial, as it must react selectively with the target analyte without interfering with other components in the solution.After the precipitation reaction is complete, the precipitate is filtered out and washed to remove any adhering impurities. The washing process is essential to ensure that the final mass measurement reflects only the desired compound. Once the precipitate is thoroughly washed, it is dried to remove any moisture, and then it is weighed using an analytical balance. This is where the precision of gravimetric analysis (重量分析) shines, as modern balances can measure mass to the nearest microgram.The mass of the dried precipitate is then used to calculate the concentration of the analyte in the original sample. This calculation often involves stoichiometric relationships derived from the balanced chemical equation of the reaction that produced the precipitate. For instance, if a chemist knows the molar mass of the precipitate and the stoichiometry of the reaction, they can determine the amount of the original analyte present in the sample based on the mass of the precipitate obtained.One of the significant advantages of gravimetric analysis (重量分析) is its ability to provide highly accurate and reproducible results. Unlike other analytical techniques that may rely on instrumental measurements subject to calibration errors, gravimetric methods are less prone to such issues. Furthermore, because the analysis relies on mass rather than volume or concentration, it can be more straightforward in certain contexts.However, gravimetric analysis (重量分析) does have some limitations. It can be time-consuming, requiring careful sample preparation and multiple steps before reaching a final result. Additionally, the method is not suitable for all types of analytes, particularly those that do not form stable precipitates or those that are volatile. In such cases, alternative analytical techniques, such as titration or spectrophotometry, may be more appropriate.In conclusion, gravimetric analysis (重量分析) remains a cornerstone of analytical chemistry due to its accuracy and reliability. It is a valuable tool for chemists seeking to quantify substances in complex mixtures. Despite its limitations, the meticulous nature of this method ensures that it continues to be taught in chemistry courses and employed in research and industry. Understanding gravimetric analysis (重量分析) not only enhances one's grasp of analytical techniques but also reinforces the importance of precision in scientific inquiry.

重量分析是一种定量化学分析方法，通过测定分析物的质量来实现。这种技术因其高精度和可靠性而广泛应用于实验室。gravimetric analysis（重量分析）的基本原理是基于质量的测量。通过将分析物转化为稳定、纯净的化合物，化学家可以准确称量该物质并计算其在原始样品中的浓度。该过程通常从样品的准备开始。样品溶解在适当的溶剂中，并通过过滤或其他纯化方法去除任何杂质。一旦溶液清澈，就添加沉淀剂与分析物形成固体化合物。这个固体称为沉淀。沉淀剂的选择至关重要，因为它必须选择性地与目标分析物反应，而不干扰溶液中的其他成分。沉淀反应完成后，沉淀被过滤并清洗，以去除任何附着的杂质。清洗过程对于确保最终的质量测量仅反映所需化合物是必不可少的。一旦沉淀彻底清洗干净，就会被干燥以去除任何水分，然后使用分析天平称重。在这一步，gravimetric analysis（重量分析）的精确性得以体现，因为现代天平可以测量到微克级别的质量。干燥沉淀的质量随后用于计算原始样品中分析物的浓度。此计算通常涉及从产生沉淀的反应的平衡化学方程式中推导出的化学计量关系。例如，如果化学家知道沉淀的摩尔质量和反应的化学计量关系，他们可以根据获得的沉淀的质量确定样品中原始分析物的量。gravimetric analysis（重量分析）的一大优势是它能够提供高度准确和可重现的结果。与其他可能依赖于仪器测量的分析技术不同，这些测量可能受到校准错误的影响，重量分析方法不太容易受到此类问题的影响。此外，由于分析依赖于质量而不是体积或浓度，在某些情况下它可能更为简单。然而，gravimetric analysis（重量分析）也有一些局限性。它可能耗时，需要仔细的样品准备和多步骤才能达到最终结果。此外，该方法不适用于所有类型的分析物，特别是那些不形成稳定沉淀或挥发性物质。在这种情况下，其他分析技术，如滴定或光谱法，可能更为合适。总之，gravimetric analysis（重量分析）由于其准确性和可靠性，仍然是分析化学的基石。它是化学家在复杂混合物中量化物质的宝贵工具。尽管存在局限性，但该方法的细致特性确保它继续在化学课程中教授，并在研究和工业中应用。理解gravimetric analysis（重量分析）不仅增强了对分析技术的掌握，还强化了科学探究中精确性的必要性。