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Description
TCI E0087 Ethylenediaminetetraacetic Acid Cadmium Disodium Salt is a cadmium chelate complex in which the cadmium centre is bound by an EDTA ligand, with two sodium ions present as charge-balancing counter-ions. The product is classified as a non-heterocyclic building block and supplies cadmium in a form that is already tightly held by the hexadentate ligand. Its primary laboratory role is to serve as a fully pre-formed metal complex, so researchers do not need to combine a cadmium salt with EDTA themselves and do not need to be concerned about the side reactions or precipitation that frequently accompany the direct addition of heavy metal ions to a solution.
The properties that lead laboratories to select this material are the stability of the complex and the convenience of solution preparation. Cadmium forms a strong complex with EDTA, so the concentration of free cadmium ions in solution is suppressed to a very low level, and the metal-to-ligand stoichiometry is already fixed at one to one within the solid itself. The disodium salt form provides good solubility in water without requiring the addition of base, and the solid is easy to weigh accurately. This certainty of composition is what makes the compound useful for work that demands a metal complex of defined ratio.
In Indonesian laboratories, this reagent fits naturally into research and analytical work carried out in university chemistry departments, government research institutes, and industrial testing laboratories where a pre-formed cadmium chelate is preferred over in-house complexation. Because the composition is defined and the solid dissolves readily in water, it suits settings in which straightforward preparation and reproducible solution composition matter more than elaborate synthetic handling of heavy metal starting materials.
Laboratory Applications
Preparation of defined cadmium chelate solutions — the fixed one-to-one metal-to-ligand ratio in the solid means the complex composition in solution is known without any separate complexation or verification step being required.
Coordination chemistry study of EDTA complexes — the compound provides a ready reference example of a hexadentate EDTA chelate with a divalent metal centre, avoiding the need to synthesise the complex before beginning experimental work.
Work requiring suppressed free cadmium ion concentration — the strong cadmium–EDTA binding keeps the level of uncomplexed cadmium ions in solution very low, which is useful where free heavy metal ions would interfere.
Building block use in non-heterocyclic synthetic chemistry — as a catalogued non-heterocyclic building block, it delivers cadmium in a stable, weighable form suitable for incorporation into further chemical preparations.
Avoidance of precipitation problems during solution make-up — because the cadmium is already chelated, the usual precipitation and side reactions from adding heavy metal salts directly to a solution are not encountered.
Specifications
Brand: TCI (Tokyo Chemical Industry)
CAS number: 35803-35-1
Category: Chemistry > Building Blocks > Non-Heterocyclic Building Blocks
Chemical form: cadmium–EDTA chelate complex as the disodium salt
Solubility: soluble in water without the addition of base
Pack sizes: available in standard TCI catalogue pack sizes; please confirm the current option when ordering
Storage: store in a tightly closed container in a cool, dry place
Handling and Storage
Store the material in its original tightly closed container in a cool, dry, well-ventilated place, away from moisture that could affect the weighability of the solid. Glass or chemically compatible plastic containers with secure closures are suitable for both storage and prepared solutions, which should be clearly labelled. Because the compound contains cadmium, treat it as a heavy metal reagent: handle it in a fume hood or well-ventilated area, wear gloves, safety glasses, and a laboratory coat, avoid generating or inhaling dust when weighing, and wash hands after handling. Collect residues and waste solutions as heavy metal chemical waste rather than discharging them to the drain, and consult the manufacturer's safety data sheet before first use.
