Overview
Alizarin Complexone is a specialized organic compound derived from alizarin, primarily functioning as a metallochromic indicator in analytical chemistry. Its unique structure allows it to form stable, colored complexes with various metal ions, particularly calcium and rare earth elements. Developed as an improvement over traditional indicators, it offers sharper endpoint detection in complexometric titrations. The compound's anthraquinone backbone provides both chromogenic and chelating properties, making it invaluable in quantitative analysis. Its selectivity for certain metal ions under specific pH conditions has cemented its role in water hardness testing, clinical diagnostics, and metallurgical analysis.
Physical and Chemical Properties
As an orange-red crystalline powder, Alizarin Complexone exhibits limited solubility in neutral water but dissolves readily in alkaline solutions. Its molecular structure contains multiple functional groups (hydroxyl, carbonyl, and iminodiacetic acid) that participate in metal coordination. The compound is thermally stable but decomposes at temperatures exceeding 300°C. The indicator undergoes distinct color changes depending on its binding state: free form appears yellow (pH < 4) or violet (pH > 11), while metal complexes typically show red or blue hues. These transitions occur within specific pH ranges (usually 10-12 for calcium detection), making pH control critical during titrations.
Main Applications
In analytical chemistry, Alizarin Complexone serves as a preferred indicator for EDTA titrations of calcium and rare earth elements. Water treatment plants employ it for hardness testing, while clinical laboratories use modified versions for serum calcium determination. The compound's affinity for lanthanides also supports rare earth element separation processes. Industrial applications include quality control in cement production (calcium analysis) and metallurgy. Researchers utilize its fluorescent properties in developing sensors for metal ion detection. Recent advancements explore its potential in environmental monitoring for heavy metal contamination in water systems.
Safety and Storage
While not classified as highly hazardous, Alizarin Complexone requires standard laboratory precautions. Use gloves and eye protection to prevent irritation from powder exposure. Avoid generating dust during handling, and work in well-ventilated areas. The compound shows low acute toxicity but may cause sensitization upon repeated exposure. For long-term storage, keep containers tightly sealed with desiccants in cool (15-25°C), dark conditions. Shelf life typically exceeds two years when properly stored. Dispose of waste according to local regulations for organic compounds, preferably through licensed chemical waste handlers.
B2B Procurement Guide
When sourcing Alizarin Complexone, prioritize suppliers specializing in analytical reagents with proper certification (e.g., ISO 9001). Key specifications include purity grade (ACS reagent or higher), batch-specific certificates of analysis, and consistent particle size distribution. Technical datasheets should confirm absorbance characteristics and titration performance. Bulk purchases (100g+) may qualify for discounts of 10-20%. Consider lead times (typically 2-4 weeks for custom purities) and request samples for method validation before large orders. For international shipments, verify compliance with transportation regulations for chemical substances.
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