Uses of EDTA - In industry, EDTA is used to sequester metal ions, prevent color modification in dyed products, and inhibit the catalysis of hydrogen peroxide. - In the food industry, EDTA is added as a preservative or stabilizer to prevent catalytic oxidative decoloration and formation of benzene. - EDTA is used in water softeners to reduce water hardness and dissolve scale in boilers. - It is used in cleaning solutions and in the cement industry for the determination of free lime and free magnesia. - EDTA is used in agriculture for solubilizing iron ions in hydroponics and preventing the formation of insoluble iron salts in above neutral soils. - Aqueous [Fe(EDTA)] is used for removing hydrogen sulfide and nitrogen oxides from gas streams. - It is also used in photography to solubilize silver particles. - EDTA was used in the separation of lanthanide metals by ion-exchange chromatography.

Medical and Laboratory Applications of EDTA - Sodium calcium edetate is used in chelation therapy to bind metal ions and treat mercury and lead poisoning. - It is used to remove excess iron from the body, especially in treating thalassemia. - EDTA solutions are used in dentistry to remove inorganic debris and lubricate root canals. - It is used as a preservative in ocular preparations and eyedrops. - In medical diagnosis, EDTA is used to evaluate glomerular filtration rate and as an anticoagulant for blood samples. - In biochemistry and molecular biology, EDTA is used to deactivate metal-dependent enzymes and suppress damage to DNA, proteins, and polysaccharides. - It acts as a selective inhibitor against certain enzymes independently of metal ion chelation. - In analytical chemistry, EDTA is used in complexometric titrations and analysis of water hardness. - EDTA has specialised uses in biomedical labs, such as preventing the worsening of corneal ulcers in animals. - It is used as an anticollagenase in veterinary ophthalmology.

Side effects and Environmental concerns of EDTA - EDTA exhibits low acute toxicity with LD (rat) of 2.0g/kg to 2.2g/kg. - It has been found to be both cytotoxic and weakly genotoxic in laboratory animals. - Oral exposures have been noted to cause reproductive and developmental effects. - Dermal exposure to EDTA in most cosmetic formulations would produce exposure levels below those seen to be toxic in oral dosing studies. - Inhalation exposure to EDTA in aerosolised cosmetic formulations would also produce exposure levels below those seen to be toxic in oral dosing studies. - EDTA is a persistent organic pollutant in the environment. - Abiotic degradation of EDTA occurs slowly and mainly in the presence of sunlight. - Direct photolysis is the most important process for the elimination of EDTA from surface waters. - Biodegradation of EDTA can be achieved at about 80% using microorganisms in wastewater treatment plants. - Alternative aminopolycarboxylates such as NTA, IDS, polyaspartic acid, EDDS, and MGDA are being investigated due to concerns about the biodegradability of EDTA.

Synthesis and Coordination Chemistry Principles of EDTA - EDTA was first described in 1935 by Ferdinand Münz. - It is mainly synthesised from ethylenediamine, formaldehyde, and sodium cyanide. - This process is used to produce about 80,000 tonnes of EDTA each year. - Impurities cogenerated by this route include glycine and nitrilotriacetic acid. - EDTA is synthesised from ethylenediamine and chloroacetic acid. - EDTA is a member of the aminopolycarboxylic acid family of ligands. - It usually binds to a metal cation through its two amines and four carboxylates, making it a hexadentate chelating agent. - Many resulting coordination compounds adopt octahedral geometry. - EDTA complexes with Mn(II), Cu(II), Fe(III), Pb(II), and Co(III) form especially strong complexes. - EDTA complexes have high affinity for metal cations and tend to be highly soluble in water.

Methods of Detection and Analysis of EDTA - SRM-CE/MS is the most sensitive method for detecting and measuring EDTA in biological samples. - SRM-CE/MS has a detection limit of 7.3ng/mL in human plasma and a quantitation limit of 15ng/mL. - SRM-CE/MS can work with sample volumes as small as 7-8nL. - HPLC can be used to measure EDTA in non-alcoholic beverages at a level of 2.0μg/mL.