Overview
Sodium gluconate is an organic sodium salt derived from gluconic acid, produced through fermentation of glucose. With CAS number 6065-27-6, this versatile compound has gained prominence in industrial applications due to its excellent chelating properties and environmental compatibility. As a biodegradable alternative to phosphates, it meets stringent environmental regulations while maintaining high performance in diverse sectors. The compound's molecular structure enables it to bind metal ions effectively, making it invaluable for water treatment and cleaning applications. Its approval as a food additive (E576) in some jurisdictions further demonstrates its safety profile, though industrial grades typically dominate B2B transactions.
Physical and Chemical Properties
Sodium gluconate presents as a white, odorless crystalline powder with excellent water solubility (approximately 59g/100mL at room temperature). The compound demonstrates remarkable stability across a wide pH range (3-12), maintaining its chelating efficacy even in alkaline environments. Its decomposition begins around 170°C without boiling, a characteristic of many organic salts. Key chemical behaviors include its sequestering capacity for calcium, iron, and other metal ions, with stability constants significantly higher than EDTA in alkaline conditions. The substance shows low volatility and negligible vapor pressure, contributing to safe handling characteristics. Its hygroscopic nature requires attention to packaging integrity during storage and transport.
Main Applications
In construction, sodium gluconate serves as a highly effective concrete retarder, delaying setting time without compromising final strength. Dosages typically range 0.1-0.3% of cement weight, allowing extended workability for complex pours. The textile industry utilizes it as a metal ion sequestrant in dyeing processes, preventing unwanted precipitation that could affect color quality. Water treatment applications leverage its ability to inhibit scale formation in cooling towers and boilers, often replacing environmentally problematic phosphates. The food-grade variant finds use as a acidity regulator and stabilizer, though industrial applications constitute over 85% of global demand. Emerging uses include agricultural formulations and pharmaceutical excipients where controlled metal ion availability is crucial.
Safety and Storage
Classified as non-hazardous under GHS standards, sodium gluconate requires no special hazard pictograms. The LD50 (oral, rat) exceeds 10,000 mg/kg, indicating very low acute toxicity. However, powder forms may cause mild eye irritation, warranting basic PPE during handling. No known carcinogenic or mutagenic effects have been documented. Optimal storage conditions involve moisture-proof containers in ambient temperatures below 30°C. Bulk storage silos should incorporate desiccant systems to prevent caking. The material remains stable for at least 24 months when properly stored, though prolonged exposure to high humidity may lead to clumping without affecting chemical efficacy. Compatibility with most common construction materials eliminates special containment requirements.
B2B Procurement Guide
Industrial buyers should specify technical grade (typically ≥98% purity) versus food/pharmaceutical grades, as pricing diverges significantly. Bulk shipments (25kg bags or supersacks) offer 15-20% cost advantages over smaller packaging. Key evaluation criteria include: residual glucose levels (<0.5%), chloride content (<0.05%), and solubility performance in target applications. Regional supply dynamics show China dominating production capacity (70% global output), with European suppliers specializing in high-purity variants. Just-in-time procurement works well given generally stable prices, though Q4 demand surges in construction sectors may temporarily tighten availability. Third-party certificates to verify include ISO 9001, Halal/Kosher (if applicable), and REACH compliance for EU markets.
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