TAP CHi HOA HOC T. 50(4) 449-454 THANG 8 NAM 2012
XAC DINH D 6 N G T H O I HAM LXfOUG C H I VA CROM BANG PHU'aNG PHAP THEM C H U A N D I ^ M H DU-A VAO SU- TAO PHLKC
Vai AZOCALIXAREN
Tran Quang Hi^u, L§ Ngpc Tii^, Nguyen Ngpc Tuan\ Le Vdn Tan*"
'Trudng Dgi hgc Cong ngh4 Sdi Gdn
^Trudng Dgi hgc Suphani Thdnh pho Ho Chi Minh
^ Vi4n Nghien cuu Hgt nhdn Dd Lgt ''Trtfdng Dgi hgc Cdng nghipp Thdnh phd Hd Chi Minh
D6nTdasogn 20-3-2012 Abstract
Two new complexes of 5,ll,I7,23-tetra[(2-ethyl acetoethoxyphenyl)(azo)phenyl]caIix[4]arene (TEAC) with Pb(ll) and Cr(in) were found in the pH range 9.5-11 in the mixture solvent methanol-water. The ratio of these complexes was 1:1 in the investigated condition. By using the Benese-Hildbrand method, the complex formation constanis were calculated for TEAC Pb(II) (K = 4.0x10*); TEAC-Cr{III) (K - 1.2x10') and the molar extinction coefficients were 5x10* and 1.42x10'', respectively. Based on the optimum conditions of the complexes formation, the HPASM has been applied for simultaneous detertninaUon of Cr(IlI) and Pb(ll) with concentration ratio of Cr{lll) to Pb{ll) varying from 2:1 to 1:20 (weight) in the mixed sample. The proposed method was successfully utilized to invest lead and chromium content in some plating waste water samples The results for several analyzed san^iles were found to be m satisfactory agreement with those acquired by using the ICP-MS technique.
I.GIOITHIEU
Azocalixaren la mgt trong nhimg dan xuat tieu bieu cua "hgp chat sieu phan tii" the he thu ba- calixaren. Cd nhieu cdng trinh nghien cuu ve kha nang tuong tdc ciia dan xudt ndy vdi cdc ion kim logi nhu Ni-" [1], Cr^* [2], Fe'" [3], Co"" [4], Pb^' [5], Cu^"
[6], Hg^* [7, 8], Th"" [9, 10]. Chi va crom la nhimg nguyen td gdy dgc ddi vdi con ngudi vd dpng vat, nd gay uc che than kinh, nguy ca ung thu vd mdt sd trieu chung lien quan den dudng tieu hda [5]. Cd the xac djnh hdm lugng hai kim loai ndy bang nhieu phuong phdp khac nhau nhu quang phd hdp thg nguyen tu, khdi phd-cao tdn cdm ung plasma (ICP-MS). Tuy nhien, khdng phdi phdng thi nghipm ndo cung cd the trang bi dugc cac thiet bi dat tiln ndy. Vi th6, vipc tim ra tin hi$u phdn tich ddng thdi cac ion cua hai kim logi nay vdi cac logi tfiudc thi> hifu ca nhu azocalixaren va d6 xudt dugc quy trinh xac djnh hdm lugng cua chiing bdng nhihig phuang phdp dcm gidn nhu UV-VIS Id viec cin thidt. Phuong phdp HPASM dirge B. Reigh va C. Falco cong bo lan ddu tien vao ndm 1988 [12]. Phuang phdp nay cd thS xac djnh dugc ddng thdi Fe(n) va Fe(ni) [16], Fe^* vd Cu^"
[20], Sb(V) va Sb(III) [17], Pd(II) vd Co(II) [18, 19],
Zn^" va Cu^' [21], Ni(II) va Mn(II) [22].
Trong cdng trinh nay, chiing tdi gidi thieu phiic chdt ciia TEAC vdi ion Pb^* va Cr'*. Da ap dung phuang phap HPASM de dinh lugng ddng thdi hai ion nay trong cdc mdu gid vd mdu nude thdi.
2. THUC NGHIEM 2.1. Hoa chat.
Axit nitric HNO3 65%; metanol (MeOH), axeton nitril (MeCN), PA Merck. Cdc muoi Th(N03)4.5H20; U02(N03)2.3H20; La(N03)j.
Sm(N03)3.6H,0, P.A (IAEA); Fe(N03)3.9H20;
Pb(N03)2, PA; Cr(N03)3.9H20 Ni(N03)2;
CH3COOH; NaOH rdn; NaN03 rdn PA Merck.
Dung djch thudc thu va dung djch phuc dugc chudn bj d cap ndng dp 2x10'^ M. Dieu chinh pH bdng dung djch dem Na2HP04/NaOH. Phdng so sdnh la Id hdn hgp dung mdi MeOH-H20 (7:3) va dung djch TEAC cd cimg ndng dg. Cdc dung dich chudn khdc dugc pha nhu cdng trinh trudc [9,10].
2.2. Thiet bi
May quang phd UV-VIS hai chiim tia Lambda
TCHH.T 50(4). 2012
25 cua hang Perkin Elmer (My); may do pit Thermo Orion-290 (My); Thiet bj ICP-MS Elan 6000 ciia Perkin Elmer....
3. KET QUA VA TllAO LUAN 3.1. Cac dieu kipn toi uu
Phd hap thM ciia 11 AC^ v;i TEAC-Pb(ll) vd TEAC-Cr(IIl) dugc khdo sat vdi nhdng so sdnh Id hdn hgp dung mdi McOH-ll;0. Kel qua bicu dicn a hinh 1 cho thay. phd hap \h\\ ciia dung djch thuoc thir TEAC (ii) cd yKi trj cgc dgi tgi budc sdng 355 nm.
Sg xuat hipn cua pic tgi 355 nm la dau hipu ciia budc nhay ciia electron n ->n* va ctia electron n >n* cua nhdm -N=N-, Ket qua ndy cung rat phu hgp vdi cdc cdng trinh da cdng bo irirdc day [9, 10], 'Irony khi dd. pho hap thg cua phuc Tl-;AC-Pb(ll) (A) vd TEAC-Cr(IIl) (c) lan lugl cd pic tgi budc sdng 4M) nm va 45S nm. So sdnh pho hap thy cua hai phirc ta thay phd ciia TEAC-Pb(lI) cd cgc dgi cao han so vdi phd hap Ihu ciia TEAC-Cr(lll) d cung nong dp, Tuy nhien, phd hdp thg cua TEAC-Cr(lll) lai cd vai rgng keo dai ve budc song dai. Hai phd nay tach bipt nhau khdng nhieu, ddng thdi trong khoang budc sdng tir 350-500 nm van cd mgt viing hap thg ciia thuoc thir.
Do mat dp quang cd tinh chat cgng tinh nen vipc xdc dinh mat do quang rieng biet ciia tirng phirc kha phuc tap Vi the, chimg tdi sii dgng phdng so sdnh td dung djch TEAC co ciing ndng dp de khdo sat lgi phd hap thu ciia cac phirc Ket qua dugc bieu dien d hinh 2 Tir ket qua nay. chung tdi nhdn thay phd ciia phirc TEAC-Pb(Il) (b) xuat hien mpt cue dai hdp phu tai budc sdng 458 nm. cdn phd hap thy ciia TEAC-Cr(III) (cJ xuat hipn budc sdng cgc dgi tgi 488 nm, Nhu vgy, ion Pb"* vd Cr'* cd khd ndng tgo phirc vdi TEAC trong dieu kien tuong tu nhu nhau.
Ket qua khdo sat cung cho thay mat dg quang ciia hp gid trj cue dai trong khoang pH = 9,5-10,5. Vi vgy, chung toi chpn khoang gta trj pH nay da ti^n hanh cac nghien cuai tiep theo.
Hinh J: Phd hap thg ciia TEAC va phirc chat ciia nd trong dung mdi MeOH-H20, pH = 10,2 vdi phdng so sanh la he dung mdi MeOH-H20; (a) Ph6 hap thg
cua TEAC 2x10^ M, (b): TEAC-Pb(II), (c)TEAC-Cr(in)
Le Vdn Tdn vd cgng sif Anh hudng cua nong dg ion kim logi den m|t d}*
quang cua hp d pH = 10 cung dugc khao sdt. Ket qud cho Ihay khi tdng diin nong dg ion Cr'* tir 0,25x10-- 20-: lO'' M Ihl mdt d§ quang cua hp cung tdng ten.
Dieu dd cho Ihay cd sg quan hp tuyen tinh giira mat dp quang A vd nong dg ion kim logi.
ITinh 2 Phd hap thg ciia TEAC-Pb(ll) (b) va TEAC- Cr(lll) (c 1 -•c 10) trong dung mdi MeOH-HiO, khi tdng nong dp cua Cr' tir0,25xI0"*M den 20xI0'^M
vdi phdng so sdnh Id TEAC tgi pH = 10,2 Thanh phdn ciia phirc cung dugc bdng phuong phap ddy ddng phdn tir gam cho thay phirc TEAC- Pb(Il) va TEAC-Cr(lII) cd ty Ip 1:1. Hdng sd tgo phiic va he sd hap thg phdn tii gam dugc xac djnh bing phuang phap Benese vd Hildbrand [11] dugc dua ra cr bang 1.
Bang I: Hdng so ben ciia phirc TEAC-M^
Phurc TEAr-Pb(ll) TEAC-Cr(ni)
K
^ ^ l O ' 1.2x10"
e 5,0x10' 1,42x10'
3.2. Phan tich dong thdi hon hgp Cr(lII) va Pb(ll) bing phirong phap HPASM i.2.1. Lira chon cap bicac song
TEAC t90 phuc dong then voi Pb^' va Cr^*
trong moi trucmg CO pH tir 9,5-10,5. Tir ph6 hap thf hinh 2, chiing toi nhiin thay ph6 cua TEAC-Pb(II) kha doi xung trong khoang 400 nm d6n 480 nm.
Trong khi do, ph6 ciia TEAC-Cr(III) l»i trai dai.
Ngoai ra, tji cjp bu6c song 420 nm va 480 nm fti mjit dp quang ciia phiic TEAC-Pb(II) la bSng nhiu trong khi do dp chenh l^ch ve m^t dp quang ciia phirc TEAC-Cr(IlI) la Ion nhjt. Vi vjy, chiing toi chpn cSp budc song phan tich la X., = 420 nm; h = 480 nm va ion CH* la ion them chuin con ion Pb^'i*
ion gay can.
450
TCHH.T 50(4), 2012
5.2.2. Nguyen tac xdy dung phu-ong phdp Chuan bi day dung dich chua ddng thdi cd hai phOrc TEAC-Cr(IlI) va TEAC-Pb(ll). Tien hdnh them chuan ion Cr^* vao dung djch hdn hgp. Do mgt dp quang cua hp sau mdi lan them chuan tgi hai budc sdng da chpn. L^p hai phuang trinh bieu diln sg phg thudc cua gia trj mgt dg quang do dugc vdo lugng Ci^* them vdo nhu sau:
+ Tgi A.| = 420 nm:
^ ^ , = 6 o , + 6 , + a ^ C , (1) + Tgi Xi = 480 nm:
A^)=bo2+^+^AC. (2)
Trong do:
A[x\)> A(X2) la mgt dg quang ciia hp tgi budc sdng
b| va b2 Id mat dg quang ciia TEAC-Pb(II) tgi budc sdng Xi, X2.
boi vd bo2 la mat dg quang cua TEAC-Cr(in) tgi budc sdng ^1, X2.
&u &n (hogc Si. ei) la hp sd gdc ciia hai dudng them chuan tgi X\,X2.
C, td ndng do ciia Cr'* them vdo he.
Hai dudng thang ndy giao nhau tai diem H cd tga do CH, AH- Xet tai diem H, ta cd:
Tir dd suy ra:
^01 +b,+a^(-C^) = b^^ +63+0^(-C/,) (3)
_(VA)±(V:M
(4)Do ndng dp ciia TEAC-Pb(II) trong he khdng thay ddi nen mat d$ quang cua phuc nay tai hai budc sdng khao sdt Id nhu nhau: b2 = b| = const, khi dd:
. c , = (^-M ,5,
Ta lgi cd: boi - a^i .CxEAc-crdii); D02 Tir (5) suy ra:
b o 2 - 3X2- CTEAC-CTCIH)-
(6) Vgy ndng dO TEAC-Cr(III) cdn tim chinh Id tri tuypt.d6i cua hoang dp di6m H.
Thay C = -Cu vd Aj = Au, ta cd:
TEAMlOm
Xac dinh ddng thdi hdm lugng chi vd
~b\ — ^niAC-phgi) A„
=>/)„ „-C
=> c (7)
'^IMC-l'hUn
^ Vdi STEAc-Pb(in I3 hp so gdc ciia dudng thdng bigu dien mdi quan hp giira nong dp Pb^* va mat do quang ciia phiic TEAC-Pb(lI). Dua vdo do ta da xdc dinh dugc ddng thdi nong dp cua TEAC-Cr(lll) va ndng dg ciia TEAC-Pb(tt) trong hdn hgp ban dau.
3.2.2. Khdo sdt dnh hucmg cua cdc ion cdn trd
De khao sat anh hudng cua cac ion Ni^*, Fe^^, Mn^\ At^*, Th(lV), Cd^\ Co^', Ni^', Ca^', Mg^*...
chung tdi tien hanh pha day dung djch phirc mau TEAC-Pb(tl). TEAC-Cr(lll) cd nong dp xdc djnh va nong dp ion can trd tdng dan. Ket qua d bdng 2 cho thay cac ion da khao sat chi ^dy cdn khi ndng dg ciia chiing cao gap tir vdi chgc Idn so vdi ion phdn tich.
Chiing tdi cung da khdo sdt khd ndng dnh hudng ciia cac anion nhu P04^ CI", S04^ CH3COO"... ket qud cho thay cac anion nay khong gdy dnh hudng d cdc ndng dp cao ban rdt nhieu Ian so vdi ion phan tich.
Bdng 2: Nong dp bdt ddu gdy can ciia mdt so ion d^n he phuc TEAC-Pb(II) 2x 10"' M va
TEAC-Cr(lIl)2xlO"^M Ion gay can
N i "
Fe'*
Cd"
C o "
Al'*
Z n "
Ca"
Mg"
M n "
Th'*
Ti le nong do gay can [M'"*l/[Cr"i, [Pb"]
80 100 80 90 100 SO 200 240 40 30
3.2.3 Xdc djnh khodng ndng do ludn theo Dinh lugt Beer
De khao sdt khodng ndng dp tudn theo djnh lugt Beer ciia ion Pb^* vd Cr** den phd hdp thg ciia he phiic. Chung tdi ti6n pha 2 day dung djch phiic TEAC-Pb(II) vd TEAC-Cr(III) sao cho ndng dp Pb^*
vd Cr** cd ndng dg tang ddn, dieu chinh pH ciia hp dSn 10 bdng dung dich dpm. Tien hdnh do mat dp quang ciia day dung djch- phtrc TEAC-Pb(II) vd TEAC-Cr(llI) cd ndng dg tir 2xl0"^-50xl0-^ M tai
451
TCHH.T 50(4), 2012
cdc budc sdng 420 vd 480 nm. Ket qua thu dugc nhu sau:
Phirc TEAC-Pb(Il) nigi dp quang (A) tgi budc sdng 420 nm vd 480 nm cd quan hp tuyen tinh vdi nong dp Pb-' trong khodng 2xlO"-35xlO"'' M. Moi quan hp dugc bieu dicn bdng phuang trinh hoi quy:
A= 0,0227 X Q I O " mol/I) - 0,0166. Tir phuang trinh ndy ta thdy hp so gdc ciia dudng thdng Id 0.0227. Do dd hp so hap thg phdn tir gam ciia phirc TEAC-Pb(lI) Ia2.27--10"'(l.cm"'.mor').
Phirc cua TEAC-Cr(lll). kcl qud cho thay tgi budc sdng 420 nm, mgt dp quang (A) tuyen tinh vdi nfing dp Cr'* trong khoang 2xl0'"'-40xl0''' M.
phuang trinh bieu dicn nidi tuong quan gi&a hai dgi lugng nay la A42o,„n= 0,0103 x C(10" inoi/l)+0.0303.
Tgi budc sdng 480nm cd phuang trinh bieu dien Id:
A4so = 0,0171 xC(10-''mol/I) +0,0405.
3-2.4 Phdn tich hdm lirgng Pb'' vdCr'' trong mdu gia
Chuan bi cac dung djch phan tich H i. H2, Hs, H^.
H5 cd ndng dg nhu bdng 3. Dua vdo sd lipu ciia bang nay, ta thay ty le ndng dp mol chenh Ipch cao nhat giii-a Cr(IIl) va Pb(ll) len din 5 lan (ty le Id 20 lan neu tinh theo khdi lugng). Do dd, neu phan tich thdnh cdng mdu gid, chung tdi cd the xac djnh dugc ham lugng hai nguyen td tren trong cac mdu thuc.
Quy trinh phdn tich mdu gid H, Chudn hi 8 binh dinh mire 25 ml, ki hieu la H|A den H|G Lan lugt cho vao mdi binh 5 ml dung djch hdn hgp phdn tich, sau dd them 10 ml dung dich TEAC 10"^ M. Ldn lugt them vao mdi binh 0,0; 0,1; 0,2; 0,3; 0,4; 0,5; 0,6;
0,7; 0,8 ml dung djch chudn Cr(III) 10"' M rdi them 5ml dung dich dpm Na2HPO4/Na0H d^ giir pH trong khoang tir 9-10, dinh muc den vgch bdng dung dich hdn hgp MeOH-H20 Ldc deu, rdi dk yen hp cho hp dn dinh rdi dem do mat dp quang tgi budc sdng 420 nm vd 480 nm vdi phdng so sdnh la dung dich TEAC cimg ndng dg
Tinh todn kit qud: Bieu dien sg phg thupc mgt dg quang ciia hdn hgp phan tich vao ndng dg Cr(in) them vdo len trgc tga dg A-C ta thu dugc 2 dudng thang bieu dien tren do thj hinh 3. Tir ket qua nay, chiing tdi thu dugc hai phuang trinh hdi quy cd dgng Id:
A420nm-0,0104xC + 0.1303 vdi R^= 0,9993 A480nm^0,0171x.C+ 0,1554 vdi R^ = 0,9991.
Ngoai suy hai dudng thdng nay, chiing cdt nhau tai diem H khi dd A420nm = A480nm = AH, dudng thdng nay cdt nhau tai diem H (-3,69; 0,093). Tir tga dg diem CLia diem H ta xac dinh dugc nong dg ciia Cr**
trong phiic la C TEAC^KIU) = -CH = 3,69x10"* M. Tung
Li Vdn Tdn vd cgngsif.
dg ciia diem H chinh Id mgt dg quang ciia phiic TEAC-Pb(II) trong dung djch, hay A TEAC-PWH) =^
0.093. Dga vdo djnh lugt Beer ta tinh dugc:
„ _ 0,093_
^TEAC-pinm : 4.13 I C M 2.23.10'
Tien hdnh phdn tich hon hgp them chuan H2, H3, HJ, lis vdi cdc ty Ip nong dg khdc nhau tuongt^r nhu III, Ket qud dugc bieu dien d bdng 3. Tir bang k^t qud ndy cho thay. so vdi nong dg mau ban dlu thi nong dO xdc djnh dugc bdng phuang phap HPASM sai khdc khdng qud 10%. Dg Ipch chuan tuang doi RSD ciia ph^p do sau 5 Ian thi nghiem ciing thap (< 7%) dieu dd chung td phugng phap ndy cd dg chinh xdc vd dp Idp Igi cao.
3.2.5. Phdn tich mdu thuc te
Chiing tdi tien hdnh phdn tich hdm lugng Cr*' vd Pb^' trong mpt sd mau nude thai xi mg dugc thu thgp tgi cdc CCT sd xi mg tren dja bdn qugn 11, Thanh pho Ho Chi Minh. Mdu dugc chira Uong can nhira PE dung tich 2 lit, sau dd dugc axit hda bdng 5 ml HNO3 1:1 den pH bdng 2.
Hmh 3: Do thj bieu dien sg phg thugc .-\ cua hdn hpp H, vao ndng dp Cr'* (CxlO'^M) lgi >,, = 420 nm,
>u2 = 480 nm
Quy trinh phdn tich mdu nude thdi: Ldy chinh xdc 500 ml nude thdi cho vdo cdc thiiy tinh chju nhipt cd dung tich I lit. Dun tren bep each cat cho den khi cgn, cho vao coc 2 ml ml dung dich hon hpp HNO3 vd HCIO4 d^ hda tan cgn, tiep tgc dun cgn cho den khi chat rdn trong day coc trdng hodn todn. De ngugi, cho vao coc nude cat hai lan roi chuyen vao binh djnh miic 50 ml. Chudn bj cdc binh djnh miic 25 ml. Hiit chinh xdc 2 ml dung djch mdu cho vao binh djnh miirc, sau dd them 10 ml TEAC 10'*M, Ldn lugt them vao moi binh 0,0; 0,1; 0,2; 0,3; 0,4;
0,5; 0,6; 0,7; 0.8 ml dung djch chudn Cr(III) 10'^ M rdi them 5 ml dung djch dpm Na2HP04/NaOH de gilj pH trong khoang tir 9-10, djnh miic deii vgdi bdng dung djch hdn hgp MeOH-H20. Ldc dSu, roi
TCHH,T. 50(4), 2012
de yen he cho dn djnh rdi do mat dg quang tgi budc sdng 420 nm vd 480 nm vdi phdng so sanh Id dung djch TEAC. Xir ly ket qua nhu phan 3.2.4,
D6 ddnh gia dg chinh xdc ciia phuang phap phan tich d6 xudt, chung toi sii dgng phuang phdp phan tich ICP-MS tren mdy Perkin Elmer Elan 6000 de xdc djnh ddng thdi hdm lugng Cr** va Pb^*. Ket qud dugc trinh bdy d bang 4. Tir kk qua ndy, chiing
Xdc dinh ddng thdi hdm luong chi vd...
tdi nhgn thay ket qua phan tich ciia phuang phap de xudt vdi phuang phap so sanh cho ket qua kha gi6ng nhau. Dieu dd cho thay phuang phdp mdi xay dung ndy cd dp tin cgy cao. Nhu vgy, chiing ta cd the cd the ap dgng phuang phdp HPASM dga vdo phirc ciia TEAC-Cr(IIl) vd TEAC-Pb(ll) de phdn tich ham lugng hai nguyen td crom vd chi trong mdu thuc te vdi chi phi thap vd thdi gian ngdn.
Bdng 3: KSt qua phan tich thuc te Cr(III) vd Pb(II) va nong dp ban dau trong hdn hgp H,, H2, H3, I i.i va H5 Mau
phan tich H I
H I
HJ
H4 Hs
Phucfng trinh hoi quy A-C A420„. = 0,0103C +0,1303 A)B0nn, = 0,0171C +0,1554 A«o.m = 0,D103C +0,1703 A™.., = 0,0171C +0,2235 A4m„„ = 0,0102c+ 0,2943 A„o.m = 0,0170C +0,4354 A4!o„,„ = 0,0103C+0,2103 A,»„„ = 0,0171C +0,2389 A420nn, = 0,0104C +0,4812 A4iio.n, = 0,0169C+0,5091
H? so tuong quan 0,9993 0.9991 0,9992 0.9989 0,9995 0.9982 0,9995 0,9995 0,9995 0,9978
Nong do mau (CxlO''M) Cr(lll)
4,00 8,00 20,00
4,00 4,00
Pb(ll) 4,00 4,00 4,00 8,00 20,00
Nong dp pliat hicii ( C K I O ' M ) Cr(lll) 3,70±0,22 7,75+0,56 20,57+1,25 4,20+0,31 4,29+0,29
l'b(Il) 4,13+0,32 4,10+0,35 3,71+0,29 7,51+0,62 19,55+1,75
Bang 4: Ket qud phdn tich hdm iugng Cr vd Pb trong nude thai (mg/L)
Mau XMl XM2 XM3
Ham luong Cr{lll) mg/L Phuong phap
HPASM 1,45+0,12 0,17+0,02 0,22+0,02
Phuong phap ICP- MS
1,36 0,16 0,24
Ham luong Pb(ll) mg/L Phuang phap
HPSAM 1,81+0,19 0,62+0,06 0,56+0,06
Phuang phap ICP-MS
1,74 0,57 0,65 4. KET LUAN
1. Da phat hien vd khdo sat dugc bdn^ sd tgo phirc, he sd hdp thg phdn tii gam, thanh phan phirc cua hai phiic chat mdi giC?a TEAC vdi Cr** va Pb^*
trong mdi trudng baza.
2. Tur cac dieu kipn tdi uu da khdo sdt, chiing tdi da dp dung thanh cdng phuang phdp HPASM de dinh lucmg ddng thdi cd hai nguyen td crom vd chi trong mau gid va trong mdu that vdi gidi hgn phdn tich khd rdng. Dp chinh xdc ciia phuang phap ciing dugc kilm tra lai bdng kT thuat phan tich hien dgi ICP-MS. Do do, cd thd thdy rdng day la phuang phap cd nhieu uu diem nhu dp chinh xdc cao, tiet kiem chi phi, thdi gian tien hdnh nhanh.
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