Ax1X8

Specifications of AG® 11 A8 Resin


Resin Crosslinkage Approx.
MW Exclusion Operating Stability/pH Range Min. Wet Capacity (meq/ml) Nominal Density (g/ml) Ionic Forms

Type: Ion retardation 8%1,000 0–14/0–14 0.7 0.7 Self-adsorbed
Functional group:
R-CH2N+(CH3)3 and
R-CH2COO-
Matrix: Acrylic acid within
styrene divinylbenzene
Applications: Contains paired anions and cation exchangesites. Selectively retards ionic substances. Useful for desalting nonionic substances and for ion removal from ionic substances; for example, removal of SDS from proteins and inorganic salts from aminoacids.


Relative Selectivity of Various Counterions on Selected AG Resins


AG 50W-X8 Resin AG 1-X8 Resin

Counterion Relative Selectivity Counterion Relative Selectivity

H+ 1.0 OH–1.0
Li+ 0.85 F– 1.6
Na+ 1.5 Propionate 2.6
NH4+ 1.95 Acetate 3.2
Mn2+ 2.35 Formate 4.6
K+ 2.5 HPO4 – 5.0
Mg2+ 2.5 IO3 – 5.5
Fe2+ 2.55 HCO3 – 6.0
Rb+ 2.6 Cl– 22
Cs+ 2.7 NO2 – 24
Zn2+ 2.7 BrO3 –27
Co2+ 2.8 HSO3 – 27
Cu2+ 2.9 CN– 28
Cd2+ 2.95 Br– 50
Ni2+ 3.0 NO3 – 65
Ca2+ 3.9 ClO3 – 74
Sr2+ 4.95 HSO4 – 85
Cu+ 5.3 Phenate 110
Hg2+ 7.2 I– 175
Pb2+ 7.5 Citrate 220
Ag+ 7.6 Salicylate450
Ba2+ 8.7 Benzenesulfonate 500
Order of Selectivity for Monovalent and Divalent Ions

Anions I > phenolate > HSO4 > CIO3 > NO3 > Br > CN > HSO3 > NO2 > Cl > HCO3 > IO3 > H2COO > Ac > OH > FCations H > Ag > Rb > Cs > K > NH4 > Na > Li > Zn > Cu > Ni > Co

The strength with which a salt is absorbed, and therefore the degree to which it is retarded and separated from organic substances,is proportional to the strength with which one or both of its constituent ions is absorbed.

Separation strategy for amphoteric molecules. If the molecule is stable at a pH above its pl, an anionexchange support is used. If the molecule is stable at a pH below its pl, a cation exchange support is used.
Stability of Selected Analytical Grade Resins to Various Treatments


Resin Heat*...