Overview
Zinc ion (Zn²⁺) is a positively charged divalent ion derived from zinc metal, essential in biological systems and industrial processes. It plays a critical role in enzymatic functions, DNA synthesis, and immune response in humans, while industrially, it is utilized for its electrochemical and catalytic properties. Zinc ions are typically supplied in compound forms like zinc sulfate or chloride for ease of handling and application. In nature, zinc ions occur in mineral deposits and are released through weathering. Industrially, they are produced via electrolysis or chemical reactions, often as byproducts of zinc refining. Their stability in aqueous solutions makes them versatile for liquid formulations in agriculture and medicine.
Physical and Chemical Properties
Zinc ions are colorless in solution and exhibit a +2 oxidation state, forming stable complexes with ligands such as water, ammonia, or organic molecules. They are redox-inactive under physiological conditions but participate in electron transfer in industrial catalysts. The ion’s small size (0.74 Å) allows it to fit into enzyme active sites, contributing to its biological significance. In water, zinc ions hydrolyze weakly, forming slightly acidic solutions. They precipitate as hydroxides at high pH but remain soluble in acidic or neutral conditions. Their solubility and reactivity can be modulated by counterions (e.g., sulfate, chloride), which are chosen based on application requirements.
Main Applications
In agriculture, zinc ions are key components of micronutrient fertilizers to correct soil deficiencies, boosting crop yields. They are also used in animal feed additives to support growth and immunity. Industrially, zinc ions are critical for galvanization (corrosion protection of steel) and as catalysts in rubber vulcanization and chemical synthesis. The biomedical field employs zinc ions in wound healing formulations, antiseptics, and dietary supplements. Recent research explores their role in biodegradable implants and antibacterial coatings. In energy storage, zinc ions are promising for rechargeable aqueous batteries due to their low cost and environmental safety.
Safety and Storage
Zinc ions pose low acute toxicity but require careful handling in concentrated forms to avoid skin/eye irritation. Inhalation of zinc-containing dusts should be avoided. Storage involves keeping solutions in corrosion-resistant containers (e.g., polyethylene) away from strong acids or bases to prevent unwanted reactions. Environmental releases must be minimized, as excessive zinc ions can harm aquatic ecosystems. Regulatory limits (e.g., EPA’s 5 mg/L for wastewater) apply in many regions. For labs and factories, PPE like gloves and goggles is recommended when handling powdered zinc compounds.
B2B Procurement Guide
Buyers should specify zinc ion concentration, compound type (e.g., zinc sulfate heptahydrate), and purity (industrial grade ≥95%, reagent grade ≥99%). Bulk purchases (tons) typically cost $5–$15/kg, while high-purity grades for pharmaceuticals may exceed $20/kg. Key suppliers include zinc refineries and specialty chemical distributors. Verify certifications like ISO 9001 for quality assurance. For liquid formulations, request stability data and compatibility with existing systems. Sample testing is advised to confirm suitability for specific applications, such as electroplating baths or fertilizer blends.
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