gravimetric analysis

简明释义

重量分析

英英释义

例句

1.The accuracy of gravimetric analysis makes it a preferred method for quantifying metal ions in environmental samples.

由于重量分析的准确性，它成为量化环境样品中金属离子的首选方法。

2.The results from gravimetric analysis were critical for our research on soil composition.

来自重量分析的结果对我们关于土壤成分的研究至关重要。

3.We learned that gravimetric analysis is often used in pharmaceuticals to ensure dosage accuracy.

我们了解到，重量分析常用于制药行业，以确保剂量的准确性。

4.In the laboratory, we performed gravimetric analysis to determine the concentration of sulfate ions in the sample.

在实验室中，我们进行了重量分析以确定样品中硫酸根离子的浓度。

5.During the quality control process, gravimetric analysis was used to verify the purity of the chemical compounds.

在质量控制过程中，使用重量分析来验证化学化合物的纯度。

作文

Gravimetric analysis is a method in analytical chemistry that involves measuring the mass of an analyte or its derivatives to determine its concentration in a solution. This technique is widely used due to its high accuracy and precision. The process typically involves several steps, including sample preparation, precipitation, filtration, drying, and weighing. Each step must be carefully controlled to ensure reliable results.To begin with, the sample containing the analyte is prepared. This may involve dissolving a solid in a suitable solvent or diluting a concentrated solution. Once the sample is ready, a reagent is added to precipitate the analyte as an insoluble compound. For example, if we want to analyze the amount of chloride ions in a solution, we might add silver nitrate, which reacts with chloride to form silver chloride, a white precipitate.After precipitation, the next step is filtration. This involves separating the solid precipitate from the liquid solution using filter paper or a centrifuge. It is crucial to ensure that no analyte is lost during this process, as it could lead to inaccurate results. Once the precipitate is collected, it is washed to remove any impurities or excess reagents that may interfere with the final measurement.The dried precipitate is then weighed. This is where the term gravimetric analysis comes into play, as the core principle of this technique revolves around measuring mass. The mass of the precipitate is recorded, and this value is used to calculate the concentration of the original analyte in the sample. The calculations often involve stoichiometry, where the relationship between the mass of the precipitate and the amount of analyte is established.One of the key advantages of gravimetric analysis is its ability to provide highly accurate results. Unlike other methods that may rely on indirect measurements or complex instruments, gravimetric methods are straightforward and rely on basic principles of mass measurement. This makes them particularly useful in situations where high precision is required, such as in pharmaceuticals or environmental testing.However, there are also some limitations to consider. Gravimetric analysis can be time-consuming and requires careful handling of samples to avoid contamination. Additionally, not all analytes can be easily precipitated, which may limit the applicability of this method. Despite these challenges, gravimetric techniques remain an essential part of many analytical laboratories due to their reliability and accuracy.In conclusion, gravimetric analysis is a powerful analytical tool that provides valuable information about the concentration of substances in various samples. By understanding the principles and processes involved in this method, chemists can obtain precise measurements that are crucial for research and quality control. As technology advances, the integration of gravimetric methods with modern analytical techniques will continue to enhance the capabilities of chemists and improve the accuracy of chemical analyses.

重量分析是一种分析化学方法，涉及测量分析物或其衍生物的质量，以确定其在溶液中的浓度。由于其高精确度和准确性，这种技术被广泛使用。该过程通常包括几个步骤，包括样品准备、沉淀、过滤、干燥和称重。每个步骤都必须仔细控制，以确保可靠的结果。首先，准备含有分析物的样品。这可能涉及将固体溶解在合适的溶剂中或稀释浓缩溶液。一旦样品准备好，就会添加试剂以将分析物沉淀为不溶性化合物。例如，如果我们想分析溶液中氯离子的含量，我们可能会添加硝酸银，它与氯反应生成氯化银，一种白色沉淀。沉淀后，下一步是过滤。这涉及使用滤纸或离心机将固体沉淀与液体溶液分离。确保在此过程中不丢失任何分析物至关重要，因为这可能导致结果不准确。一旦收集到沉淀，就会对其进行清洗，以去除任何可能干扰最终测量的杂质或多余试剂。然后对干燥后的沉淀进行称重。这就是重量分析一词发挥作用的地方，因为这种技术的核心原理围绕着质量测量。沉淀的质量被记录下来，这个值用于计算样品中原始分析物的浓度。这些计算通常涉及化学计量学，在这里建立了沉淀质量与分析物数量之间的关系。重量分析的一个关键优点是它能够提供高度准确的结果。与其他可能依赖间接测量或复杂仪器的方法不同，重量分析方法简单明了，依赖于基本的质量测量原理。这使得它们在需要高精度的情况下特别有用，例如在制药或环境测试中。然而，也有一些限制需要考虑。重量分析可能耗时，并且需要小心处理样品以避免污染。此外，并非所有分析物都可以轻易沉淀，这可能限制该方法的适用性。尽管面临这些挑战，重量分析技术仍然是许多分析实验室的重要组成部分，因为它们的可靠性和准确性。总之，重量分析是一种强大的分析工具，提供有关各种样品中物质浓度的宝贵信息。通过理解这种方法所涉及的原理和过程，化学家可以获得对研究和质量控制至关重要的精确测量。随着技术的进步，重量分析方法与现代分析技术的结合将继续增强化学家的能力，提高化学分析的准确性。