nang hap ph~ cao nhat. Co tM si\p xep khii nang hilp phu cua cac ion cung hoa trj nhu sau:
Li+<Na-t- <Ie <Rb+ <Cs'" l'vlg2t<Ca2-t- <Sr2-t- <Ba2t
CI'<Br'<NO,<!'<CNS'
. Hoa tri ion cang cao (di~n tich Ian) cang d~ bi hap ph~
1<'"<Ca2-t- <AL3-t- <Th4-t-
b. Hilp ph1!- trao d6i:
Trang hap ph~ trao d6i, chat hap ph~ hap phu mQt luqng ion xac dinh nao do til trong dung djch va dong thai My mQt luqng tuong
duong cac ion khac co cung dau di~n tich ella ban than no vao dung
dich. SI! hap phu trao d6i co mQt so' dac diem sau:
C6 tinh ch(;>n 19C cao, st! trao doi chi xay ra vui nhung IOf,li ion xac
djnh tuy thuQc vao biin chat cua chat hap ph~ va ion bj hap ph~. Qua trinh trao d6i khong phiii luon luon la thu~n nghjch, sl! trao d6i co t6c dQ nh6, neu sl! trao d6i co Sl! tham gia cua ion H' hoilc OR thi pH cua moi twang so thay d6i.
VI.5A. Dng d1!-ng:
Silc ky hap ph~ co khii nang ling d~ng rQng rai vi trll cac ion va co, h§u het mgi chat d~u t6 ra c6 mQt dQ hap ph~ nilD d6. Tinh huu hi;;u cua phuong phap tang len thea kich thuac phan til' cua chat ciln tach. Phuong phap dilc bi~t quan trgng khi tach cac chat mall. MQt
Dni [-foe DiL Lat - 2002
thu~n Igi khac Iii c6 th§ tach dugc cac d6ng philn l~p th§ nho cac chat hap ph~ ho~tdling Quang h9C. Dudi day Iii mlit so vi d~:
Chilt hilp phu Thich hdp dE\' tach
Ca(OHj, Cac carotenoid
CaCO, Cac xanthophyll, naphtoQuinon
Ca,(PO,j, Cac protein
CaC2O" Cae antraQuinon
CuSO, Cae d§. n xuat azobenzen
BuonJ( Cac chlorophyJ, xanhthophyll
Cellulose Cac duonl!, ohii'm nhuom MaJ(iesi Iicat Cac duonl! acetat, steroid
Than ho~ttinh Cac duong, aminoacid, hydrocacbon I phan nhanh
SiJical!el Tach dU<1C nhi~u chat khac nhau Al,O, Tach dU<1Cnhi~u chat khac nhau
DaiHoc Bii Lat - 2002
B. V~T LI'¢U vA PHUONG pHAp NGHIEN CUD: