3-Hydroxyethylethylene diaminetriacetic acid

Iron can be controlled with certain complexing agents, in particular glucono-5-lactone, citric acid, ethylenediaminetetraacetic acid, nitrilotriacetic acid, hydroxyethylethylene diaminetriacetic acid, hydroxyethyliminodiacetic acid, and the salts from the aforementioned compounds. These compounds must be added together with nitrogen-containing compounds such as hydroxylamine salts or hydrazine salts [486,643,1815]. 

In general, chelating agents possess some unique chemical characteristics. The most significant attribute of these chemicals is the high solubility of the free acids in aqueous solutions. Linear core flood tests were used to study the formation of wormholes. Both hydroxyethylethylene diaminetriacetic acid and hydroxyethyliminodiacetic acid produced wormholes in limestone cores when tested at 150° F. However, the efficiency and capacities differ. Because these chemicals have high solubility in the acidic pH range, it was possible to test acidic (pH less than 3.5) formulations [644]. 

Several synthetic chelating agents are being used in agriculture for the correction of deficiencies of one or more of the four metallic elements mentioned above. These include ethylenediaminetraacetic acid (EDTA), ethylenediamine di(o-hydroxyphenylacetic acid) (EDDHA), diethylenetriaminepentaacetic acid (DTPA), hydroxyethylethylene-diaminetriacetic acid (HEDTA), and nitrilotriacetic acid (NTA). (Wallace, 1960, 1963a, b, 1965 Haertl, 1963 Brown, 1969). 

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