L-Aspartic acid, N,N’-1,2-ethanediylbis-, sodium salt (1:3);

CAS No.: 178949-82-1
EC / List no.: 605-842-8

N,N’-EthyleneDiamine Disuccinic acid Sodium salt, EDDS;
Trisodium ethylenediamine disuccinate;
(S,S)-Ethylenediamine disuccinic acid trisodium salt;
Sodium ethylene diamine disuccinate;
trisodium 2-({2-[(1-carboxy-2-carboxylatoethyl)amino]ethyl}amino) butanedioate

EDDS trisodium is an chelating agent (sequestering/complexing agent).
EDDS is made from L-aspartic acid, readily biodegradable, phosphorus-free.

Especially in hard water systems, EDDS is still excellent at chelating transition metal ions (e.g. Fe3+, Cu2+), before chelating hard water ions (calcium, magnesium).


  1. In hard water, relative to calcium and magnesium ions, it still has high selectivity for transition metal ions such as copper and iron.
  2. Within a wide pH range, EDDS can effectively complex and sequester heavy metals such as Fe3+, Cu2+, and Ca2+, Mg2+.
  3. High thermal stability, high stability in concentrated alkaline solutions.

Technical Data:

AppearanceColorless to yellow-brown liquid
SolubilitySoluble in water
Solid content [%]45 min.
Active content (EDDS-Na) [%]37 min.
pH-Value at 25℃9.0 min.
Density at 25℃ [g/cm3]1.25 min.
EDDS-3Na, CAS# 178949-82-1

Main functions:

  1. It has high selectivity for copper and iron ions. In the presence of calcium and magnesium, transition metal ions such as copper, and iron ions are still preferentially chelated.
  2. Reduce the impact of water hardness in formula or process use, and improve the compatibility of hard water.
  3. Improve the effectiveness of fungicides in the formula.
  4. Prevent discoloration and odor. Improve antioxidant properties, reduce the oxidation catalysis of heavy metals on fatty acids, and prevent odor and discoloration.
  5. High stability, suitable for wide pH values, resistant to strong alkaline environments, and resistant to high temperatures.
  6. Environmentally friendly chelating agent, easy to biodegradable and easy to rinse.

Application fields:
Household detergents, clothing cleaning agents, I&I (industrial and Institute) cleaning agents, textile printing and dyeing auxiliaries, bleach stabilizers, photographic agents, pulp and paper additives, descaling and anti scaling agents, metal treatment processing aids, steel plate cleaning agents, semiconductor cleaning agents, aluminum shell anti sedimentation (aluminum etching), electroplating pre-treatment agents (degreasing agents, rust removers), water treatment agents, agriculture, soil improvement agents, personal care Cosmetic use, etc.

Package and storage:
25kg or 30kg per plastic drum;
250kg per plastic drum; 1250kg per IBC.
Store in a cool and ventilated place indoors, moisture-proof, storage period of 12 months.

Similar chemical:
EDDA acid (without sodium salt) Synonyms:
CAS# 20846-91-7 (EC# 439-840-1);
L-Aspartic acid, N,N’-1,2-ethanediylbis-;
N,N’-Ethylenediamine disuccinic acid;

Chelating Agents products:

Traditonal Chelating Agents
Aminopolycarboxylates: EDTA acid, EDTA-Na/K, DTPA & DTPA-5Na/5K
Polyphosphonates: HEDP, DTPMP, ATMP

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