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The Example of Succinic acid derivative degradable chelants, uses and compositions thererof
EXAMPLE 1
An approximate 0.01M iron (ferric) chelate solution of ethylenediamine N,N'-disuccinic acid(cas:110-15-6) (EDDS) was prepared by adding 1.46 grams of EDDS (0.0050 moles) and 200 grams of deionized water to a beaker. The mixture was stirred with a magnetic stirrer bar and the pH was adjusted to approximately 8.7 by the addition of an aqueous ammonia solution. Approximately 2.3 grams of an iron nitrate solution (11.7% iron) from Shepherd Chemical Company was added with stirring. The iron chelate solution (pH=3.1 ) was diluted in a volumetric flask to a final volume of 500 milliliters with deionized water. Fifty gram aliquots of the above solution were then placed in 2 oz. bottles and the pH adjusted to 5.0, 6.0, 7.0, 8.0, 9.0 and 10.0 by the addition of a few drops of an aqueous ammonia solution. The samples were allowed to stand for 7 days at which time the pH 10 sample had iron hydroxide present. "Overheads" from each of the samples were filtered and analyzed for soluble iron by inductively coupled plasma spectroscopy. The results are given in Table 1.
EXAMPLE 2
An approximate 0.01M iron chelate solution of ethylenediamine N-monosuccinic acid(cas:110-15-6) (EDMS) was prepared by adding 0.88 grams of EDMS (0.0050 moles) and 200 grams of deionized water to a beaker. The mixture was stirred with a magnetic stirrer bar and approximately 2.3 grams of iron nitrate solution (11.7% iron) was added with stirring. The iron chelate solution (pH=2.3) was diluted in a volumetric flask to a final volume of 500 milliliters with deionized water. Fifty gram aliquots of the solution were placed in 2 oz. bottles and the pH adjusted to 5.0, 6.0, 7.0, 8.0, 9.0 and 10.0 by the addition of a few drops of an aqueous ammonia solution. The samples were allowed to stand for 7 days at which time the pH 9 and 10 samples had iron hydroxide present. "Overheads" from each of the samples were filtered and analyzed for soluble iron by inductively coupled plasma spectroscopy. The results are given in Table 2.
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