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Ethylenediaminetetraacetic acid disodium salt dihydrate

Pharmaceutical Secondary Standard; Certified Reference Material

Edetate disodium salt dihydrate, Disodium ethylenediaminetetraacetate dihydrate, EDTA disodium salt, Edathamil, Edetate Disodium, Edetate disodium dihydrate, EDTA-Na2, Sequestrene Na2
Empirical Formula (Hill Notation):
C10H14N2Na2O8 · 2H2O
Número de CAS:
Peso molecular:
EC Number:

Quality Level


certified reference material
pharmaceutical secondary standard


current certificate can be downloaded


HPLC: suitable
gas chromatography (GC): suitable


248 °C (dec.) (lit.)

Featured Industry

Pharmaceutical (small molecule)



pharmacopeia traceability

traceable to PhEur D2900000
traceable to USP 1233009

SMILES string




InChI key


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General description

Pharmaceutical secondary standards for application in quality control, provide pharma laboratories and manufacturers with a convenient and cost-effective alternative to the preparation of in-house working standards.


These Secondary Standards are qualified as Certified Reference Materials. These are suitable for use in several analytical applications including but not limited to pharma release testing, pharma method development for qualitative and quantitative analyses, food and beverage quality control testing, and other calibration requirements.
Ethylenediaminetetraacetic acid disodium salt dihydrate may be used as a pharmaceutical reference standard for the determination of ethylenediaminetetraacetic acid (EDTA) in pharmaceutical formulations using ion chromatography with suppressed conductimetric detection.
Ethylenediaminetetraacetic acid disodium salt dehydrate may be used as a reference standard in validating the potential antioxidant activity and the total phenolic content of samples of seaweed extract via metal chelation technique using ferrous ion-chelating ability assay.
Chelator of divalent cations. Inhibits enzymes, such as metalloproteases, that require divalent cations for activity.

Analysis Note

These secondary standards offer multi-traceability to the USP, EP (PhEur) and BP primary standards, where they are available.

Other Notes

This Certified Reference Material (CRM) is produced and certified in accordance with ISO 17034 and ISO/IEC 17025. All information regarding the use of this CRM can be found on the certificate of analysis.


To see an example of a Certificate of Analysis for this material enter LRAA5634 in the Documents slot below. This is an example certificate only and may not be the lot that you receive.


Exclamation markHealth hazard



Hazard Classifications

Acute Tox. 4 Inhalation - Aquatic Chronic 3 - STOT RE 2 Inhalation

Target Organs

Respiratory Tract

Storage Class Code

11 - Combustible Solids

WGK Germany


Flash Point F

Not applicable

Flash Point C

Not applicable

Certificado de Análisis

Certificado de origen

Total phenolic compounds, radical scavenging and metal chelation of extracts from Icelandic seaweeds
Wang T, et al.
Food Chemistry, 116(1), 240-248 (2009)
EDTA determination in pharmaceutical formulations and canned foods based on ion chromatography with suppressed conductimetric detection
Krokidis AA, et al.
Analytica Chimica Acta, 535(1-2), 57-63 (2005)
Haiyan Zhang et al.
Analytica chimica acta, 770, 140-146 (2013-03-19)
A novel method for selective determination of Cr(III) and Cr(VI) in environmental water samples was developed based on target-induced fluorescence quenching of glutathione-stabilized gold nanoclusters (GSH-Au NCs). Fluorescent GSH-Au NCs were synthesized by a one-step approach employing GSH as reducing/protecting...
Gervasio A Lamas et al.
JAMA, 309(12), 1241-1250 (2013-03-28)
Chelation therapy with disodium EDTA has been used for more than 50 years to treat atherosclerosis without proof of efficacy. To determine if an EDTA-based chelation regimen reduces cardiovascular events. Double-blind, placebo-controlled, 2 × 2 factorial randomized trial enrolling 1708...
Akeisha N Sanders et al.
Microbiology (Reading, England), 159(Pt 9), 1842-1852 (2013-07-09)
Escherichia coli has five genes encoding L,D-transpeptidases (Ldt) with varied functions. Three of these enzymes (YbiS, ErfK, YcfS) have been shown to cross-link Braun's lipoprotein to the peptidoglycan (PG), while the other two (YnhG, YcbB) form direct meso-diaminopimelate (DAP-DAP, or...

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