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Xylenol Orange Tetrasodium Salt CAS 3618437 China Suppliers and Factory
Xylenol orange tetrasodium salt (CAS No. 3618-43-7) is a high-performance metallochromic indicator essential for precision complexometric titrations. Engineered for superior water solubility compared to free acid forms, this reagent is indispensable for the accurate detection and quantification of metal ions, including zirconium, thorium, and various rare earth elements, across industrial and environmental samples.
Designed for high sensitivity and stability, this chemical intermediate enables precise endpoint detection in EDTA titrations and spectrophotometric analysis. Its unique structural ability to form colored complexes with over 30 different metals makes it a versatile tool for quality control in pharmaceuticals, water hardness testing, and advanced histological staining for visualizing metal ion distribution.
Detailed Parameters
| Chemical Name | Xylenol orange tetrasodium salt | CAS No. | 3618-43-7 |
|---|---|---|---|
| Molecular Formula | C31H28N2Na4O13S | Molecular Weight | 760.58 |
| EINECS No. | 222-805-8 | Appearance | Reddish brown crystal powder |
| Water Solubility | Passes test (Easy deliquescence) | Alcohol Solubility | Insoluble |
| Sulfated Ash | 30% ~ 35% | Loss on Drying | 15% max |
Key Advantages
Enhanced Solubility
The tetrasodium form provides significantly improved water solubility, enabling the preparation of highly stable analytical solutions.
Rapid Response
Features a sharp and distinct color transition from yellow to red upon metal complexation for precise titration endpoints.
High Sensitivity
Capable of detecting trace metal concentrations, making it ideal for water quality testing and metallurgical analysis.
Broad Versatility
Effective as an indicator for over 30 different metals, supporting diverse qualitative and quantitative analyses.
Visual Precision
Ideal for histological staining and zymography to visualize metal ion distribution and enzyme activity.
Industry Standard
Meets rigorous purity standards for pharmaceutical quality control and environmental monitoring applications.
Product Gallery
Management Platforms
Inventory Control
Strict batch tracking and FIFO management for all specialty chemical intermediates.
Quality Assurance
Rigorous testing for sulfated ash and drying loss to ensure consistent purity levels.
Regulatory Compliance
Full adherence to EINECS and international chemical safety shipping standards.
Supply Chain Stability
Optimized logistics for fiber drum packaging ensuring zero contamination during transit.
Specialized Storage
Climate-controlled environments to manage the deliquescent nature of the product.
Tech Support
Professional guidance on preparing analytical solutions and titration protocols.
Investment Return Comparison
| Feature | Standard Grade Indicator | Xylenol Orange Tetrasodium |
|---|---|---|
| Solubility Speed | Slow/Variable | Rapid (High Water Solubility) |
| Detection Limit | Moderate | High (Trace Metal Sensitivity) |
| Stability in Solution | Low (Degrades faster) | High (Stable Analytical Prep) |
| Color Contrast | Subtle Transition | Sharp Yellow-to-Red Shift |
| Application Range | Limited Metals | 30+ Different Metal Ions |
Frequently Asked Questions
The tetrasodium salt form offers significantly enhanced water solubility, making it far easier to prepare stable, concentrated analytical solutions for laboratory use compared to the free acid.
The color change is due to structural rearrangement of the sulfonephthalein framework. In acidic solutions, it is yellow; when it coordinates with metal ions, the electron delocalization changes, shifting the color to red.
It is widely used for detecting zirconium, thorium, rare earth elements, aluminum, bismuth, lead, and determining water hardness through calcium and magnesium ions.
Due to its easy deliquescence (ability to absorb moisture from the air), it should be stored in tightly sealed containers, preferably in a cool, dry environment away from moisture.
Yes, it is frequently used in pharmaceutical QC for the visual titration of bismuth, lead, and other metallic impurities to ensure product safety and compliance.
The product is typically supplied in 25kg fiber drums, designed to protect the crystalline powder from environmental contamination and moisture during shipping.
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