Description
Specifications Table
Product Name – Sodium metabisulfite LR
Quantity/Pack Size – 500 g
Form – Powder
Grade – LR (Laboratory Reagent)
Application – Reducing agent, preservative, and dechlorination in lab processes
Product Overview
Sodium metabisulfite LR is a high-purity laboratory reagent widely recognized for its strong reducing properties and stability in aqueous solutions. This fine, white crystalline powder is highly soluble in water, making it ideal for precise chemical reactions where controlled oxidation-reduction conditions are required. Its LR grade ensures low impurity levels, minimizing interference in sensitive analytical procedures. The compound acts as an effective preservative by inhibiting microbial growth and preventing oxidation in stored solutions. In laboratory settings, it serves as a reliable dechlorinating agent, neutralizing chlorine residues in water samples without introducing additional contaminants. The chemical’s stability under standard storage conditions ensures long shelf life, provided it is kept in a cool, dry environment away from moisture and incompatible substances. Sodium metabisulfite LR is particularly valued for its consistent performance in titrations, synthesis reactions, and as a sulfur dioxide source in gas-generation setups. Its non-hygroscopic nature further enhances handling convenience, reducing the risk of premature degradation during weighing or transfer.
FAQs
1. What is the shelf life of sodium metabisulfite LR when stored properly?
When stored in an airtight container in a cool, dry place away from direct sunlight and moisture, sodium metabisulfite LR typically retains its efficacy for 24–36 months from the date of manufacture. Exposure to humidity or high temperatures can accelerate decomposition, so always reseal the packaging after use.
2. Can this grade be used for food preservation applications?
While sodium metabisulfite is commonly used as a food preservative (E223), the LR grade is specifically formulated for laboratory use and may contain trace impurities not suitable for food contact. For food-grade applications, always select a product certified as food-safe with appropriate compliance documentation.
3. How does sodium metabisulfite LR compare to sodium bisulfite in lab reactions?
Sodium metabisulfite (Na₂S₂O₅) releases sulfur dioxide more gradually than sodium bisulfite (NaHSO₃), making it preferable for controlled reduction reactions. It also has a higher sulfur content per unit weight, which can be advantageous in synthesis processes requiring precise stoichiometry. However, bisulfite may be more soluble in certain solvents.
4. What precautions should be taken when handling this chemical?
Always wear protective gloves, goggles, and a lab coat when handling sodium metabisulfite LR, as it can irritate skin, eyes, and respiratory tract upon contact or inhalation. Work in a well-ventilated area or fume hood, especially when dissolving in water, as it releases sulfur dioxide gas. Avoid mixing with strong acids or oxidizing agents to prevent hazardous reactions.
5. Is this product compatible with plastic labware for storage?
Sodium metabisulfite LR can be stored in high-density polyethylene (HDPE) or polypropylene (PP) containers, as these materials are generally resistant to chemical degradation. Avoid using metal containers, as prolonged contact may cause corrosion. Always ensure the container is chemically inert and properly sealed to prevent moisture absorption.
