Diammonium oxalate monohydrate or Oxalic acid diammonium salt monohydrate or Ammonium ethanedioate monohydrate

Product Overview & Quality

Product Name: Ammonium oxalate monohydrate 99.5% or Diammonium oxalate monohydrate or Oxalic acid diammonium salt monohydrate or Ethanedioic acid diammonium salt monohydrate
Brand: QReC (Product Code: QR-A5110-1-0500)
Grade: Analytical Reagent High Purity Grade (AR Grade) featuring a certified chemical assay of not less than 99.5 percent in a 500 g laboratory container. Multi-crystallized and purified under strict QReC global laboratory specifications without anti-caking conditioning additives, strictly maintaining stoichiometric monohydrate crystalline hydration. Strictly analyzed to enforce minimal water-insoluble matter (strictly below 0.005 percent) and sulfated ash (residue on ignition below 0.02 percent), alongside ultra-low ppm limits of chloride, sulfate, phosphate, magnesium, and calcium. Trace heavy metals (such as iron, lead, copper, zinc, and arsenic) are controlled at minimal parts-per-million levels. Dry, uniform colorless crystalline prisms dissolve cleanly in water to yield clear, neutral-to-acidic solutions free of turbidity. Packaged in a heavy-duty, moisture-barrier polymer container fitted with an airtight double hermetic seal.
Physical Properties: Colorless transparent prismatic or needle-like crystals or fine white crystalline powder. Odorless with a cooling, saline-metallic taste. Stable under ambient conditions; decomposes upon heating above 70 to 100 degrees Celsius, losing water of crystallization and undergoing thermal decomposition into ammonia, water, carbon monoxide, and carbon dioxide. Non-combustible inorganic-organic salt. Aqueous solutions are neutral to weakly acidic (pH approximately 6.0 to 7.0 for a 4 percent aqueous solution at room temperature).
Solubility: Moderately soluble in water at room temperature (approximately 4.5 to 5.0 grams per 100 milliliters at 20 degrees Celsius; solubility increases substantially in boiling water, exceeding 11 to 12 grams per 100 milliliters); practically insoluble in ethanol and diethyl ether.
Key Use: Universally utilized as the standard analytical precipitating agent for the quantitative determination of calcium ions (via both gravimetric analysis as calcium oxalate monohydrate/calcium oxide and indirect permanganometric redox titration) in limestone, gypsum, cement, mineral ores, metallurgical fluxes, soil, and agricultural fertilizers. Extensively applied in analytical chemistry for the separation and precipitation of rare-earth elements, lead, and multivalent transition metal cations. Heavily employed in hematology and clinical diagnostic research as an in vitro anticoagulant (often formulated in double-oxalate mixtures alongside potassium oxalate) by chelating and precipitating free ionized calcium from whole blood specimens. Serves as an analytical buffer component, rust removal agent, and precursor for synthesizing oxalato metal coordination complexes in coordination chemistry.

Safety & Hazards (Harmful if Swallowed/In Contact with Skin & Hypocalcemia/Renal Hazard)

Classification: Harmful if swallowed or in contact with skin (Acute Toxicity Oral/Dermal Category 4). Causes serious eye irritation (Eye Irritation Category 2). May cause mild skin and respiratory tract irritation.
Health Risks: Direct ocular contact triggers acute chemical stinging, conjunctival erythema, corneal irritation, and profuse lacrimation. Dermal contact causes localized erythema, dryness, burning sensations, and dermal absorption. Inhalation of particulate dust irritates the mucous membranes of the upper respiratory tract, inducing coughing, sneezing, choking, and dyspnea. Critical Systemic Toxicological Risk: Systemic absorption of oxalate ions leads to acute chelation of blood plasma calcium, precipitating life-threatening hypocalcemia, muscle spasms, tetany, cardiac dysrhythmias, and the deposition of insoluble calcium oxalate crystals in renal tubules, culminating in acute tubular necrosis and acute renal failure. Ingestion causes acute burning pain in the oral cavity, esophagus, and stomach, accompanied by vomiting, hemorrhagic gastritis, severe abdominal cramps, convulsions, shock, and cardiovascular collapse.
First Aid Measures: Immediately flush affected eyes with an abundant stream of clean flowing water for at least 15 minutes while stripping contaminated clothing; remove contact lenses promptly and seek medical attention if irritation persists. Wash exposed skin thoroughly with soap and water for at least 15 minutes. In case of dust inhalation, relocate the individual to fresh air. If accidentally swallowed, do NOT induce vomiting; thoroughly rinse mouth with water, and immediately administer calcium-containing liquids (such as calcium gluconate solution, calcium lactate, or copious amounts of milk) to bind and precipitate oxalate as unabsorbable calcium oxalate in the digestive tract, and transport to an emergency medical facility immediately.

Handling & Storage

Storage: Oxalate Salt, Systemic Nephrotoxin, and Thermally Sensitive Compound. Must be preserved in its original, tightly closed QReC container. Store in a clean, strictly dry, cool, and well-ventilated dedicated chemical store at controlled temperatures (below 25 to 30 degrees Celsius), sheltered from atmospheric humidity, heat sources, and direct sunlight. Keep strictly segregated from strong oxidizing agents (such as permanganates, chromates, and perchlorates), concentrated mineral acids (which liberate free oxalic acid), and strong caustic alkalis (which liberate toxic ammonia gas).
Precautions: Standard laboratory PPE is mandatory, including protective nitrile gloves, splash-proof safety goggles, a certified particulate dust mask, and a protective lab coat. “Technical Handling Precaution: Minimize dust generation during weighing and dispensing; perform powder handling in a certified laboratory fume hood to avoid inadvertent inhalation of toxic oxalate dust.” Re-seal container cap tightly immediately after sampling. Collect and treat oxalate chemical wastes properly; never discharge concentrated oxalate solutions directly into municipal wastewater systems.