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Zincon indicator is a colorimetric indicator used for the spectrophotometric determination of zinc, mercury, and copper. Zinc indicators may exhibit a specific color under normal conditions, but this color may change as they dissolve in solvents or react with specific metal ions. It usually exists in the form of solid powder or particles for easy storage and transportation. These solid forms may appear as fine powders or tiny particles. When dissolved in an appropriate solvent, it will form a uniform and transparent solution.
This solution may appear in a specific color and be used for colorimetric reactions with metal ions. Insoluble in organic solvents, slightly soluble in water and alcohol, dark red purple powder. It is mainly used for the determination of zinc, mercury, and copper in spectrophotometry. The concentration of these metal ions can be accurately determined through colorimetric reactions. In addition, it can also be used for the determination of zinc in automated flow injection analysis, improving the efficiency and accuracy of the analysis. When stored simultaneously, it should be placed in a cool, dry, and well ventilated place, avoiding direct sunlight and high temperatures.
Additional information of chemical compound:
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Chemical Formula |
C20H16N4O6S |
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Exact Mass |
440.08 |
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Molecular Weight |
440.43 |
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m/z |
440.08(100.0%),441.08(21.6%),442.07(4.5%),442.09(2.2%),441.08(1.5%),442.08(1.2%) |
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Elemental Analysis |
C, 54.54; H, 3.66; N, 12.72; O, 21.80; S, 7.28 |
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Melting point |
250-260℃(dec.) |
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Zincon indicator is a widely used colorimetric indicator in chemical analysis. The following is a detailed explanation of its applications:
The product plays a crucial role in the spectrophotometric determination of zinc ions. The principle is that the zinc indicator undergoes a specific chemical reaction with zinc ions to produce a compound with a specific color. The color intensity of this compound is directly proportional to the concentration of zinc ions, so the concentration of zinc ions can be accurately determined by measuring the color intensity of the reaction product.
This method has the advantages of high sensitivity, high accuracy, and easy operation, and is widely used in fields such as environmental monitoring, water quality analysis, and food testing. In addition to zinc ions, it can be used for spectrophotometric determination of mercury ions. Similar to zinc ions, zinc indicators react with mercury ions to produce a compound with a specific color. By measuring the color intensity of this compound, the concentration of mercury ions can be accurately determined.
Automated flow injection analysis is an efficient and accurate chemical analysis method that combines the advantages of flow injection analysis and automation technology to achieve rapid and accurate determination of multiple parameters. Zinc indicators also have wide application value in automated flow injection analysis. By injecting the zinc indicator together with the sample to be tested into the flow injection analyzer, rapid and accurate determination of metal ions such as zinc, mercury, and copper can be achieved. This method has the advantages of fast analysis speed, easy operation, and high accuracy, and is particularly suitable for rapid screening and analysis of large quantities of samples.
Other application areas
In addition to the main uses mentioned above, zinc indicators can also be applied in other fields. For example, in environmental monitoring, zinc indicators can be used to accurately determine the content of metal ions such as zinc, mercury, copper, etc. in the atmosphere, water, and soil. They can quickly respond to the concentration of target metal ions, providing important and reliable data support for environmental quality assessment, pollution source tracing and targeted pollution control measures.
In food testing, zinc indicators can be used to detect and determine the heavy metal content in various foods, including grains, vegetables, meat and aquatic products. This helps to effectively screen out food products that do not meet safety standards, ensuring the safety and quality of food and protecting consumers' health.
In addition, zinc indicators can also be widely applied to the determination and analysis of metal ions in fields such as biomedical research and materials science. In biomedical research, they assist in detecting trace metal ions in biological samples like blood and tissue, providing a basis for studying the role of metal ions in physiological and pathological processes. In materials science, they help analyze the distribution and content of metal ions in new materials, facilitating the development and optimization of material performance.
Principles and Methods of Measurement
Measurement principle
The principle of zincon indicator for measuring metal ions is mainly based on its chemical reaction with metal ions. During the reaction process, the zinc indicator combines with metal ions to form a compound with a specific color. The color intensity of this compound is directly proportional to the concentration of metal ions, so the concentration of metal ions can be accurately determined by measuring the color intensity of the reaction product. The accuracy of this method depends on multiple factors, including reaction conditions, concentration of indicators, type and concentration of metal ions, etc.
Measurement method
Before conducting spectrophotometric measurements, appropriate treatment of the sample is required. For example, for water quality samples, it may be necessary to remove interfering substances such as suspended solids and organic matter; For solid samples, it may be necessary to dissolve them in an appropriate solvent and dilute them to the appropriate concentration. The accuracy and consistency of sample preparation are crucial for the accuracy of measurement results.
Add an appropriate amount of zinc indicator to the sample to be tested. The concentration of the indicator should be adjusted according to the concentration of the metal ion to be tested and the reaction conditions. Generally speaking, the concentration of the indicator should be high enough to ensure complete reaction with metal ions, but it should not be too high to avoid interfering with the measurement results.
Under appropriate temperature and pH conditions, allow the zinc indicator to fully react with metal ions. After the reaction is complete, observe the color change of the reaction product. The color intensity is directly proportional to the concentration of metal ions, so the concentration of metal ions can be accurately determined by measuring the color intensity.
Measure the color intensity of the reaction product using a spectrophotometer or other appropriate instrument. Convert color intensity to the concentration of metal ions based on known standard curves or formulas. The standard curve or formula is usually obtained by pre measuring the color intensity of a series of known concentrations of metal ion solutions.
1. Synthesis Principle
The core synthesis of the product (CAS No. 62625-22-3) involves three consecutive reactions: diazotization, hydrazone formation, and coupling. Using o-aminobenzoic acid, o-hydroxyaniline-5-sulfonic acid and other raw materials, the target product in the form of purple-brown powder is finally obtained. The reaction process must strictly control the low-temperature conditions to avoid side reactions and ensure the purity and yield of the product.
2. Main Raw Materials and Reagents
The core raw materials include o-aminobenzoic acid, o-hydroxyaniline-5-sulfonic acid, sodium nitrite, sodium sulfite, zinc powder, acetic acid, concentrated hydrochloric acid, 5% sodium hydroxide solution and ethanol. All reagents should be of analytical grade, among which sodium nitrite should be taken and used immediately to avoid oxidation and deterioration affecting the reaction effect.
3. Specific Synthesis Steps
First, prepare the hydrazone compound: mix o-aminobenzoic acid with water to form a paste, slowly add concentrated hydrochloric acid, cool to 0℃, then add sodium nitrite for diazotization. Then add sodium sulfite paste, acetic acid and zinc powder at 10℃, stir at a constant temperature for 2 hours until the solution is transparent. Filter, cool the filtrate and add concentrated hydrochloric acid for crystallization to obtain o-carboxyphenylhydrazine.
Then react with benzaldehyde-ethanol solution to precipitate benzaldehyde-2-carboxyphenylhydrazone for later use. Subsequently, carry out coupling and purification: add o-hydroxyaniline-5-sulfonic acid to ice water and hydrochloric acid, cool to below 5℃, add sodium nitrite for diazotization, and control the end point with potassium iodide-starch test paper. Then add the mixed solution of hydrazone and sodium hydroxide, control the temperature ≤10℃, stand for 2 hours and filter. Adjust the filtrate to acidity with acetic acid, and recrystallize the precipitated crystals with ethanol to obtain the pure zincon indicator.
By the mid-20th century, the demand for quantitative analysis of metal ions had grown increasingly urgent. Traditional indicators suffered from drawbacks such as poor selectivity and insufficient sensitivity, making it difficult to accurately detect trace amounts of metal ions including zinc and copper. This caused considerable inconvenience in fields like environmental monitoring and chemical production. Against this backdrop, the search for highly efficient and specific metal indicators became a research focus in analytical chemistry. The discovery of the product precisely responded to this industrial need.
The product was first proposed and reported by Rush and Yoe in 1952. It was initially developed as a colorimetric reagent for the quantitative determination of zinc (Zn²⁺) and copper (Cu²⁺) ions, and its name derived from its highly selective binding property toward zinc ions. As a formazan compound, it exhibits a distinctive color reaction and can form a stable blue complex with zinc ions under weakly alkaline conditions. This feature distinguished it from conventional indicators and quickly attracted industrial attention.
In 1954, Rush and Yoe further refined its detection method, clarifying its chromogenic mechanism and application conditions, which laid the foundation for its industrial application. Over the following decades, researchers continuously explored its application scope and found that it could also bind various metal ions such as mercury and nickel. With appropriate masking and demasking strategies, selective detection of specific metal ions could be achieved. Subsequent studies also optimized its synthetic process and performance, extending its use to food testing, biomedicine, and other fields, making it an indispensable and important indicator in analytical chemistry.
The product is a valuable tool in analytical chemistry, offering high sensitivity, selectivity, and simplicity for the detection and quantification of metal ions. Its wide range of applications in environmental analysis, biological research, industrial quality control, and pharmaceutical analysis highlights its importance in various fields.
Despite some limitations, such as interference and pH sensitivity, recent advancements in nanotechnology, sensor development, and green chemistry are expected to overcome these challenges and further enhance the performance and sustainability of zincon-based analysis. As research continues to evolve, it will likely remain a key player in metal ion detection, contributing to advancements in science and technology.
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