Diammonium Citrate | Diammonium Hydrogen Citrate — High-Purity Reagent Grade | Cat. No. ASC-8020
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Diammonium Citrate
Diammonium Hydrogen Citrate — High-Purity Reagent Grade | Cat. No. ASC-8020
ASC-8020 CAS 3012-65-5 Assay 100.60% ✓ pH 4.98 🇦🇺 Melbourne
CAS No.
3012-65-5
Mol. Weight
226.18 g/mol
Assay
98.5–101.0%
pH
4.5–5.5
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Overview
Diammonium Citrate (Diammonium Hydrogen Citrate) is the diammonium salt of citric acid, supplied as a high-purity white powder with a characteristic weak ammoniacal odour. It is widely used across analytical chemistry, food formulation, and agricultural testing applications.
In analytical chemistry, it is a standard component of matrix solutions for MALDI-TOF mass spectrometry and is used in the determination of citrate-soluble phosphate in fertilizers. In food applications, it functions as a flavour enhancer, pH control agent, and sequestrant.
Typical Applications
🔬
Analytical Chemistry
MALDI-TOF matrix solutions
🌾
Agricultural Testing
Citrate-soluble phosphate in fertilizers
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Food Formulation
Flavour enhancer, pH control, sequestrant
🧪
Laboratory Reagent
Citrate buffer preparation
FAQs
❓ What is diammonium citrate used for in mass spectrometry?
Diammonium citrate is a common additive in MALDI-TOF (matrix-assisted laser desorption/ionization time-of-flight) matrix solutions, where it helps improve peak resolution and reduce unwanted fragmentation, particularly in oligonucleotide and phosphopeptide analysis.
❓ How is diammonium citrate used in fertilizer testing?
A standard neutral ammonium citrate solution is used in official fertilizer analysis methods to extract and quantify "citrate-soluble" phosphate — the fraction of phosphate that becomes available to plants over time, as distinct from water-soluble phosphate. This is a recognised step in determining a fertilizer's total available phosphate content.
❓ Is diammonium citrate the same as ammonium citrate (tribasic)?
No — diammonium citrate (this product, CAS 3012-65-5) has two of citric acid's three carboxylic acid groups neutralised by ammonium ions. Triammonium citrate is a different, more fully neutralised salt. The two are not interchangeable in applications sensitive to pH or exact stoichiometry.
Intended Use
⚠️ For laboratory and industrial use. Refer to the Safety Data Sheet before use.
Chemical & Physical Information
| Product Name | Diammonium Citrate (Diammonium Hydrogen Citrate) |
| Catalogue Number | ASC-8020 |
| CAS Number | 3012-65-5 |
| Chemical Formula | C₆H₁₄N₂O₇ |
| Molecular Weight | 226.18 g/mol |
| EC Number | 221-146-3 |
| Appearance | White powder, with ammoniacal odour |
| Solubility | Soluble in water |
| Storage | Preserve in well-closed containers |
Synonyms
Ammonium citrate dibasic · di-Ammonium hydrogen citrate · Citric acid ammonium salt · Citric acid, diammonium salt · Diammonium hydrogen 2-hydroxypropane-1,2,3-tricarboxylate
Typical Specifications
| Parameter | Specification |
|---|---|
| Description | White powder, with ammoniacal odour |
| Solubility | Soluble in water |
| Chloride | Not more than 0.002% |
| Sulphate | Not more than 0.02% |
| Heavy metals | Not more than 0.001% |
| pH | 4.5 to 5.5 |
| Residue on ignition | Not more than 0.1% |
| Assay | 98.5% to 101.0% |
Exact analytical values for a given shipment are provided in the batch-specific Certificate of Analysis.
Quality & Supply Assurance
Supplied with Certificate of Analysis (COA) for every batch
Consistent batch-to-batch quality
Technical support available from AuSaMicS Life Science
Consistent batch-to-batch quality
Technical support available from AuSaMicS Life Science
⚠️ Full 16-section GHS SDS available — support@ausamics.com
Hazard Identification (GHS 7th Ed / WHS 2023)
!
| Classification | Eye Irritation Category 2; STOT — Single Exposure (Respiratory Irritation) Category 3 |
| Signal Word | Warning |
| Hazard Statements | H319 — Causes serious eye irritation. H335 — May cause respiratory irritation. |
Handling & PPE
| Engineering Controls | Local exhaust ventilation or fume hood when weighing bulk powder |
| PPE | Safety glasses/goggles (required per H319), nitrile gloves, lab coat; P1/P2 particulate respirator for bulk powder handling |
| Storage | Well-closed containers, cool, dry place, protected from moisture |
First Aid Summary
| Eyes | Rinse cautiously with water for several minutes. Seek medical attention if irritation persists. |
| Inhalation | Remove to fresh air. Seek medical attention if symptoms persist. |
| Skin | Wash with soap and water. |
| Ingestion | Rinse mouth with water. Consult a physician if a large quantity is swallowed. |
Transport & Regulatory
| Transport | Not classified as dangerous goods (ADG / IATA / IMDG) |
Certificate of Analysis — Batch DAC/2627/004
| Batch Number | DAC/2627/004 |
| Batch Size | 25 kg |
| Manufacture Date | July 2026 |
| Expiry Date | June 2029 |
| Test | Limit | Result |
|---|---|---|
| Description | White powder, with ammoniacal odour | White powder, with ammoniacal odour |
| Solubility | Soluble in water | Soluble in water |
| Chloride | ≤ 0.002% | Less than 0.002% |
| Sulphate | ≤ 0.02% | Less than 0.02% |
| Heavy metals | ≤ 0.001% | Less than 0.001% |
| pH | 4.5 to 5.5 | 4.98 |
| Residue on ignition | ≤ 0.1% | 0.038% |
| Assay | 98.5% to 101.0% | 100.60% |
Conclusion: Complies with in-house specification (FP/SPEC/006). For batch-specific COAs on future lots, contact support@ausamics.com quoting the catalogue and lot number.