Overview
Chlorophenol Red (CPR) is an organic compound belonging to the sulfonphthalein family of pH indicators. It is widely recognized for its distinct color change from yellow (acidic) to red (basic) within the pH range of 4.8 to 6.4. The compound is synthesized through sulfonation and halogenation processes, yielding a stable powder suitable for laboratory use. Due to its reliable performance and sharp endpoint, Chlorophenol Red is commonly employed in titrations, particularly in biochemical and environmental testing. Its molecular structure includes chlorine substituents, which enhance its stability and solubility in organic solvents.
Physical and Chemical Properties
Chlorophenol Red appears as a dark red to brown crystalline powder. It exhibits moderate solubility in ethanol and alkaline solutions but is only slightly soluble in water. The compound decomposes at approximately 250°C, making it unsuitable for high-temperature applications. As a pH indicator, CPR undergoes a reversible color change dependent on the hydrogen ion concentration. Its transition range (pH 4.8-6.4) makes it ideal for monitoring weakly acidic to neutral solutions. The compound’s absorbance spectrum peaks at 435 nm (yellow form) and 572 nm (red form), allowing for spectrophotometric analysis.
Main Applications
Chlorophenol Red is primarily used as a visual pH indicator in titration experiments, particularly in microbiology and clinical diagnostics. It is also incorporated into pH test strips and buffer solutions for quick assessments of sample acidity. In biochemistry, CPR serves as a marker in enzyme assays and cell culture media to monitor metabolic activity. Environmental labs utilize it to test water quality, as its sensitivity to pH changes helps detect pollutants or shifts in aquatic ecosystems. Industrial applications include its use in dye formulations and chemical synthesis.
Safety and Storage
While Chlorophenol Red is not highly toxic, it requires careful handling to avoid irritation. Direct contact with skin or eyes may cause mild inflammation, and inhalation of dust should be prevented. Always use gloves, goggles, and a lab coat when working with the powder. Store CPR in a tightly sealed container in a cool, dry place, protected from light and moisture. Exposure to humid conditions may degrade its performance. Dispose of waste according to local regulations for halogenated organic compounds.
B2B Procurement Guide
When sourcing Chlorophenol Red, B2B buyers should prioritize suppliers that provide certificates of analysis (CoA) to verify purity (typically ≥95%). Bulk purchases for industrial use may qualify for discounts, but ensure the material meets ASTM or reagent-grade standards. Key procurement considerations include packaging (e.g., amber glass bottles for light sensitivity), lead times, and compatibility with downstream processes. Reliable suppliers often offer technical support for application-specific queries. Compare prices across vendors, as costs vary based on quantity and purity.
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