Overview
1,10-Phenanthroline solution is a versatile chemical reagent primarily composed of 1,10-phenanthroline dissolved in water or organic solvents. This heterocyclic compound serves as a bidentate ligand, forming stable complexes with transition metals, particularly iron(II). The solution is standardized for analytical applications due to its distinct colorimetric response with Fe²+, producing an orange-red complex measurable at 510 nm wavelength. In industrial contexts, the solution is typically prepared at 0.1-0.3% w/v concentrations, though specialized formulations exist for trace metal analysis. Its stability and selectivity make it indispensable in environmental testing, pharmaceutical quality control, and metallurgical laboratories.
Physical and Chemical Properties
The solution's properties vary by solvent system. Aqueous solutions exhibit neutral pH (6-8) and remain stable for months when refrigerated. The active component, 1,10-phenanthroline, shows UV-Vis absorption maxima at 265 nm and 360 nm in methanol. Its iron complex has a molar absorptivity of 11,100 L·mol⁻¹·cm⁻¹, enabling sensitive detection limits (0.02-4.0 ppm Fe). Key reactivity includes oxidation prevention by ascorbic acid in analytical protocols. The ligand forms 3:1 complexes with Fe²+ (log β3 = 21.3), with reaction completeness achieved within 10-15 minutes at room temperature. Solvent choice affects sensitivity—ethanol solutions yield 15% higher absorbance than aqueous systems.
Main Applications
The primary use is iron quantification via ISO 6332 and ASTM D1068 standards, critical for water treatment plants and boiler feedwater analysis. In materials science, it serves as a corrosion inhibitor research tool by forming protective films on metal surfaces. Pharmaceutical manufacturers employ it for catalyst residue testing in APIs. Environmental labs utilize the solution for soil and wastewater Fe speciation studies. Recent applications include battery electrolyte research (Li-ion systems) and as a fluorescence quencher in biochemical assays. Industrial users should note that chloride ions above 100 ppm may interfere with Fe measurements.
Safety and Storage
As a Category 2B potential carcinogen (IARC), workplace exposure should be minimized using fume hoods and nitrile gloves. Spills require neutralization with 5% acetic acid before water rinsing. Flash points vary by solvent—ethanol-based solutions are flammable (FP 16°C) and demand Class B fire extinguishers. Optimal storage uses amber PTFE-lined bottles under nitrogen blanket for extended stability. Shelf life extends to 24 months at 4°C, but precipitation may occur below -5°C. Incompatible with strong oxidizers (e.g., peroxides) and concentrated acids—segregate from these materials.
B2B Procurement Guide
Bulk buyers should request certificates of analysis (CoA) verifying: (1) Absorbance ratio (A265/A360) ≥ 2.0, (2) Iron content < 0.0005%, and (3) Residual solvents per ICH Q3C. For ISO 17025 accredited labs, pre-standardized ampoules reduce preparation errors. Technical specifications should define: solvent matrix (e.g., 40% ethanol/water), preservatives (often 0.1% sodium azide), and packaging (20L HDPE carboys vs. 1L glass bottles). MOQs typically start at 5L for custom formulations. Lead times range from 2 weeks (stock solutions) to 6 weeks for GMP-grade batches.
Related Manufacturers
- 主营：阻燃剂、催化剂、洗涤剂、丙二醇、酸二氢铝、异戊二醇、4-丁二醇、二甲胺硼烷、硫酸铵、醋酸镧、起泡剂、清洗剂、碳酸钙、抗氧剂、灭火剂、交联剂、粘合剂、封头剂、聚乙烯醇、对氯溴苯、生物试剂、息香乙醚、香精香料、2-氯丙烯腈、2-己基癸酸
- 主营：硫酸铜、指示液、铁离子、标准溶液、缓冲溶液、锰离子、镁离子、缓冲液、硫酸镁、碘化钾、氯化钠、氯离子、蒸馏水、葡萄糖、氯化物、碳酸钠、钛离子、储备液、四苯硼钠、甲醛试纸、氢氧化钾、磷表试剂、草酸试剂、硫代乙酰胺、电脑水冷液
- 主营：中药对照品、药物杂质标准品、中药农产空白基质、药典标准溶液、分析标准品、标准物质、标准品、对照品