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The Sequestrant of Choice |
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Background
 more information is available for our
registered members
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Sequestrants are employed in a
diverse range of products and processes – from household
products to industrial applications.
To sequester means to „withdraw from use“ and in
particular sequestrants are used to sequester metal ions
such as iron, copper, nickel, cobalt, chromium, calcium and
manganese.
Sequestrants act by forming strongly associated but
soluble complexes with metal ions thereby preventing them
from precipitating out or becoming involved in other
reactions. These metal ions find their way into products as
a result of, for example, hardness in water, directly from
the soil or as a contaminant in raw materials.
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Sequestrant capability
more information is available for our
registered members
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A measure of the tendency towards
formation of metal complexes in aqueous solution is the
stability constant, K.
| Metal Ion
|
Stability
Constant,
K
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Ca2+ |
2.19
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| Cd2+
|
2.1
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| Cu2+
|
2.3
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| Ni2+
|
1.6
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| Pb2+
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2.8
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| Zn2+
|
1.8
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Table 1. Log of Stability constants with adipic acid at
25ºC.
Table 1 demonstrates that Adi-pure® is able to form
stable metal complexes with many different metal
ions.
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