Tap chi Khoa hpc vS Cdng nghe 49 (1) (2011) 101-109
XAC DINH NHOM HIDROCACBON THQM BTEX TRONG NUaC VA KHONG KHJ
B A N GPHl/ONG PHAP SAC KJ KHi K^T HOP v o l
KTTHUAT VI CHI^T PHA
R A N M A N GKIM R 6 N G P H U T R O N G
Nguyen Du-c Hue\ Tran Manh T r i \ Do Quang Huy\ Dang Van Ooan^
'Tnrdiig Dgi hoc Khoa hoc Tu nhien. DHQGHN ' I Vt'" Khoa hpc hinh sir. Bo C dug an
Lien he vdi tdc gia: doanc2l(a'vcih(>o.con!
Den Tda soan ngay: 7 4/2010 l . D A T \ AN DE
Phuang phdp chiet tmyen thdng xu li ede mau mdi trudng trong phdn tich hChi ea la ehilt long - Idng vd chiet pha ran. Cdc phuang phdp na\ thudng mdt nhilu thdi gian, khd tu ddng hod, dpe hai \ a ehi phi cao do ddi hoi lugng dung moi tinh khilt ldn. Mae dii cd thl chilt dugc lugng ldn chat nhung trong phdn tich sac ki lai chi cdn rat it (mpt vdi pL mdu) vd dp chpn lpc cua eac phuang phdp tru\ en thdng thudng khdng cao [1]. Nham khdc phuc nhirng nhugc dilm ndy, cdc phuang phdp vi chiet dugc nghien ciiu vd img dung rpng rai nhu mpt sy thay thl quan trpng bao gom: \ i chiet pha Idng (LPME). vi chilt pha rdn (SPME), vi chilt pha rdn ddng sir dung kim r6ng phii ttong (SPDME).
Vi chiet pha ran ddng su dung kim rdng phii trong Id mpt kT thudt vi chiet dya tren can bdng phdn bd ciia cdc cdu tu trong mdi tmdng phdn tich len mdt mdng mdng (pha tmh) dupe tdm len thdnh ben trong eiia mdt kim tiem rdng. Khdc vdi vi chiet pha ran sai, pha tinh dugc phii len mdt sgi nho vd Idng qua mdt kim rdng, do do chieu ddy mdng pha tinh bi gidi ban, tinh ben ea hpc thdp vd khd khan khi thyc hien vdi mdu khi. Nghien cim kT thudt SPDME tren ca sd SPME la mpt sy cdi tien mdi, gdp phdn hodn thien kT thudt chudn bj mdu cho phdn tich sac ki [2, 3, 4].
Trong bdi bdo nay, chiing tdi gidi thieu edch che tao cpt chiet SPDME tren ca sd pha tTnh pplimetylphenylsiloxan (OV-17) vd su dung edt SPDME ndy de xdy dung quy trinh phan tich xdc djnh cdc hgp chdt hidrocacbon tham nhdm BTEX trong nude vd khong khi bang phuang phdp sac ki khi.
2. THlTC NGHIEM 2.1. Hoa chdt va thiet bi
2.1.1 Hod chdt
Cdc pha tinh poliacrylat (PA), polimetylphenylsiloxan (OV-17) va polidimetylsiloxan (PDMS) ciia hang Kasei Kogoy (Tokyo Kasei Kogyo Co., Ltd, Nhat Bdn).
Nguyin Du'c Hu$, Trin M^nh Tri, Dd Quang Huy, DSng Van DoSn
Cac dung mdi diclonielan, axclon, etanol, n-hcxan... loai linh khiet phan tich ciia cdc hdng Fluka (Buchs, lliuy S\). Merck (Darmstadt, Ddc).
Cac chai chudn bcn/cn, toluen, elylbcn/cn, m-xilcn (B llvX) loai linh khiet sdc ki ciia hdng Merck (Darmsladl, Due).
Cac mum Na^SO,. NaNO,, NaCl, KNO,... loai tinh khiet phan tich ciia hang Merck (Darmstadt, Diic).
2.1.2. Thiet bi
Thill bj sdc ki khi (iC Agilent 7X90A (My), detecUr FID.
Cac dung cu thuy tinh, may bill chan khdng, mdy khuay tir, bam tiem Hamilton (loai 5, 10, 25 \a 100 pL), bam kim ticMU y tc (loai 0,5; I; 3 vd 5 mL)...
2.2. Che tao thiet bj SPDME
Thilt bj ciia kT thual SPDME dugc die tao tu chinh kim tiem y te Qua khdo sdt chiing toi lya chpn kim tiem y tc co chieu ddi 30,8 mm, ducmg kinh ngoai 0.65 mm va dudng kinh trong 0,38 mm. Trudc khi tam kim tiem dugc rua sach bdng nude edt, etanol vd diclometan.
Vdi ddi tugng la eac hidrocacbon nhdm Bl 1:X, pha tTnh dugc nghien ciru lya chpn Id polimetylphenylsiloxan. Pha tTnh ndy dugc pha trong diclometan \di ndng dp 0,05 g/mL.
Cach tdm: Ldm day kim tiem bang dung djch tdm d tren, giiir yen d dieu kien phdng cho dung mdi diclometan bay hai het. Diing mdy sdy Idm kho, sau dd dua phdn kim tiem dd tdm vdo ddu injecta cua mdy sdc ki khi de Idm sach dung mdi vd ede tap chdt de bay hcri. Dua ra bdo qudn kin de tien hdnh vi chiet vd cd the tdi su dung nhieu ldn.
2.3. Xac dinh chieu day mang tam
Chieu ddy mdng tdm dugc xdc djnh bang cdng thirc [ 1 ]
A = R [R^-(m:-m,)/D.7r.h]'- (*) trong dd R Id bdn kinh trong cua kim tiem, nii \ a m^ Id khdi lugng cua kim tiem trudc va sau khi
tdm, D Id khdi lugng rien ciia pha tTnh vd h Id chieu ddi cua kim tiem (phdn dugc tdm pha tinh).
Ket qud xdc djnh chieu ddy mdng tdm pha tTnh polimetylphenylsiloxan trong dung moi diclometan vdi ndng dp 0,05 g/mL tren kim tiem Id 23,5 pm.
Ket qud xdc djnh chieu ddy mdng tdm pha tTnh tren kinh hien vl dien tu quet (SEM) (hinh 1, hinh 2) Id 22 pm. Nhu vay ket qua xac djnh chilu ddy mdng tdm qua tinh todn bdng cdng thirc bdn thyc nghiem vd xac djnh tren SEM Id gdn tuang ddng nhau.
2.4. Md ta qua trinh vi chiet
Dua kim tiem vdo trong Ip dyng mau phdn tich (mau Idng hoac khi) da dugc bjt kin. Tien hdnh keo, ddy pittdng len xudng nhieu ldn, ldm cho mdt phdn lugng mau phdn tich di vdo kim tiem vd tiep xiic lien tuc vdi mdng pha tTnh, cdn bdng phan bd tam thdi dugc thilt lap. Sau mpt khodng thdi gian dat can bang phdn bd todn bd, dua kim vi chilt ra khdi mdi trudng mdu vd day ngay vdo dau injecta cua mdy sdc ki khi. Tai day nhd ddng khi mang ndng, cdc chdt phdn tich dugc gidi hdp ra khdi mdng pha tTnh vd di vdo cot tdch sdc ki. Gidi hdp xong kim vi chilt dugc dua ra khdi dau injecta cua mdy sac ki khi, bdo qudn lai vd cd the tdi su dung.
XSc dinh nhdm hidrocacbon tham btex trong nw&c va khdng khi bing phwang phap
Hinh 1. Mai ciit cua kim rong phu trong Hinh 2. Mang pha tTnh
2.5. Xay dyng quy trinh \i chilt cac hop chat hidrocacbon thom nhdm BTEX trong m'l long De xay dyng qu\ trinh \ i chiet cdn phdi toi uu hoa cac ylu Id dnh hudng: Ti le thl tich khong gian hai (KGH) \a dung djch, nhiet dp, loai mudi them vdo dung djch, thdi gian vi chiet... Moi \eu td dnh hudng dugc nghien ciru ddc lap khi cd djnh ede ylu t l con lai.
•6ai00
• i j : [ i o '20010 100000
•5 8oou;
2 eoooo
20000 0
• 0' ^ U 2 12 Ti : Iii l i c t KGKfdDD^ dich - £ e ' ; £ - —•—Toije' —*—etylbenzen —»«—m • lilen j
Loai m \i6i
I B e n z c D • T o l u e n O E i y l b e n z e n • m - x i l e D
Hinh 3. Anh hudng KGH/dung djch Hinh 4. Anh hudng loai muoi
2 0 0 0 0 0
1 5 0 0 0 0
' ^ 1 0 0 0 0 0
~ 5 0 0 0 0 ^ — » —
25 30
— • — B e n z e n — " — T o l u e n
*
40 50 60 N h i e m s (°C)
—a—Elylbenzen —x—m
— •
70
-xilen
1 4 0 0 0 0 1 2 0 0 0 0 1 0 0 0 0 0 : 8 0 0 0 0 : 6 0 0 0 0
\ 4 0 0 0 0 '• 2 0 0 0 0
0
Khflng k h u i y
50 100 2 0 0 Tdc it k h u i y ( v / p )
Benzen — " — T o l u e n — ^ — E t y l b e n z e n —><—m-xilen
Hinh 5. Anh hudng nhiet dp Hlnh 6. Anh hudng toe do khuay
Nguyin DCrc HuS, Trin M^nh Tri, Dd Quang Huy, DSng VSn DoSn
H O O O O ^ 1 2 0 0 0 0 I 100000 I : 6 0 0 0 0 I
; 6 0 0 0 0 ; i 40000
> 2 0 0 0 0 0
L- • B e n z e n
5 7 1 0 1 3 1 5 Tlii)i fiin Iphi
• T o l u e n — ' > — E i v l b e n z e n —*<—m j i i e n
Hinh 7 Anh hudng thdi gian vi chiet
Ti Ic thl tich KGH mau tren dung djch: Mdu dugc chira trong Ip (14 ml) vdi cdc ti le the tich khdc nhau la: 9 : 5; 7 : 7; 4 : 10; 2 : 12, ket qud thu dugc nhu d hinh 3.
Anh hudng cua cdc loai mudi khdc nhau: Tien hdnh khdo sdt qud trinh vi chiet khi them vdo dung djch nude tung loai mudi gdm: NaCl, Na2S04, NaN03, K2SO4, KNO3, Na^SOj, ket qud thu dupe d hinh 4. Anh hudng ciia nhipt dp: Lp mdu dung djch vd KGH dugc ddt trong binh dieu nhiet vd duy tri trong qud trinh vi chiet d nhirng nhipt dp khdc nhau: 25°C (nhiet dp phdng), 30"C, 40°C, 50°C, 60°C vd 70°C, kit qud thu dugc nhu d hinh 5.
Tdc dp khudy trong dung dich: Khudy dung djch de cho cdn bang Idng - hai cua cdc chdt trong dung djch vd tren phdn KGH lien tyc dugc thiet lap nhanh ttong qud trinh vi chiet. Tdc dp khudy dugc thay ddi ldn lugt: khdng khudy, 50 vdng/phiit, 100 vdng/phiit \a 200 vdng/phut, ket qud dugc cho nhu d hinh 6.
Thdi gian vi chiet: Thdi gian vi chiet Id khodng thdi gian dugc tinh tir khi bdt dau dua kim vi chiet vdo vd dua ra khdi KGH. Thdi gian vi chiet Id tdi uu khi can bang phan bd ciia chat phdn tich vdo pha tTnh dugc thiet lap. De xdc djnh thdi gian dat cdn bdng phan bd, chiing tdi tien hdnh vi chiet vdi nhirng khodng thdi gian: 3 phut, 5 phut, 7 phiit, 10 phiit, 13 phiit vd 15 phut, ket qud khdo sdt chi ra nhu d hinh 7.
2.6. Xay dung quy trinh vi chiet cac hpp chat hidrcacbon thom nhdm BTEX trong mau khi Tien hdnh khdo sdt cdc yeu td dnh hudng:
Thdi gian d^t cdn bang phdn bd: Cdc chdt chuan dugc cho dong thdi vdo binh lay mdu cd van khod hai chieu vd thl tich 1 lit: benzen (1 pL), toluen (5 pL), etylbenzen (5 pL), m-xilen (5 pL). Trong khi vi chilt dugc giOr co djnh d nhipt dg 27°C va toe dp keo pittdng la 10 lan /phiit, ket qud thu dugc nhu d hinh 8.
Tdc dg keo-ddy pittdng: Khi khdo sat tdc dp keo, day pittdng cung can phai cd djnh cdc dieu kien khdc nhu nhiet dp vi chiet, the tich binh chua mau vd vdi ciing mgt khoang thdi gian la
15 phut, chi thay ddi so ldn keo, ddy pittdng trong 1 phut, ket qua thu dugc nhu d hinh 9.
Anh hudngcua nhi?t dp: Nhi?t dp cd dnh hudng rat ldn din kT thuat vi chiet, nhdt la khi thuc hi?n vdi mau khi, vi cdc can bdng dgng hgc trong qua ttinh vi chilt diu bj anh hudng bdi nhiet dp. Nhiet dp qud thap, can bang Idng hai ciia cac cau tu trong mau khi bj chuyin djch ve
XSc dinh nhdm hidrocacbon tham btex trong nw&c vS khdng khi bSng phwang phSp ...
trang thdi tdn tai d the Idng, cdn khi nhiet dp qud cao se Idm tdng qud trinh gidi hap ciia ede cdu tir chiet dugc ra khdi pha tTnh. Vdi cdc chat BTEX trong mau khi cd ndng dp nhd (< 5 pL/lit khi), ehiing tdi khdo sdt trong khodng nhi?t dp 20°C din 80°C, kit qud thu dugc nhu d hinh 10.
1400 Dien tich Th5i gian vi chiei
Bylbenzen
- X — m - X l l e n
ThW gian (phiit) 15 20 25
Di4n tich 1200 , pfc 1000 ^M^
800 600 400 200 0 '
c
jr •-!-••'
T6'c d6 kdo. ddy pittong
20 40
' '• » Banzan
• • Toluan
Etylbon?on
- /< -- m-»len
-
S« ldn kio, diy/phut
60 80
Hinh <s' Anh hudng thdi gian vi chilt Hinh 9. Anh hudng tic dp k^o pittong
Didn li'ch
16000 P'<:
14000 12000 10000 8000 6000 4000 J 2000 ]
ot
Nhiet d6 vi chia't
>^-X ¥,—¥r~-^^
20
-Benzen -Toluen -Bylbenzen - m-Xlen
Nhiet d6 ( t o 40 60 80 100
Hinh 10. Anh hudng nhiet dp
3. KET QUA VA THAO LUAN
3.L Pha tinh trong vi chiet pha rdn dpng siir dung kim rong phu trong
Lya chon pha tTnh dung trong vi chilt ndi chung vd vi chilt pha rdn ddng su dung kim rdng phii trong la mdt trong nhimg budc quan trpng nhdt. Ca sd lya chpn pha tTnh dugc dua tren cdc yeu cau vl khd nang bdm dinh tdt, do bin nhiet cao, khdng tan^trong mdi trudng chiia chat phdn tich vd cd tinh chon lpc cao ddi vdi cdc cdu tu can chilt. Yeu to chpn lpc phu thudc vdo bdn chdt cua timg loai pha tTnh vdi nhdm cdc cdu tu can chilt, tinh ttrang ddng ve cdu tao cung nhu dp phan eye tuang ddi.
Viec khao sdt cho thay vdi cdc hidrocacbon tham nhdm BTEX, pha tTnh polimetylphenylsiloxan (OV-17) cho hieu qua chilt tot nhdt. Dieu ndy Id phu hgp do pha tTnh OV-17 cd dp phan eye ylu vd trong cdu true cd vdng tham tuang ddng ve cdu tao vai eac hidrocacbon tham.
Nguyin Du-c Hu$, Trin M^nh Tri, Dd Quang Huy, Dang Van Doan
\( )l
( ) S I
C I I I
( ) S I
( I I
Polimetyl(65'!';i)plicnyl(35'!'o)siioxan
3.2. Chieu ddy mang pha tinh
Lua chpn dugc pha iTnh phii hgp trong kT thuat vi chict pha ran donjj su dung kim rdng phii trong la mdt budc quan tioim. tuy nhicn chicu day mang lain cung qu\el djnh den hieu qua vi ehicl, nhat la \ c yen to thiri gian \a tin nhay cua phuang phap. Budc cai lien quan trpng ciia kT thuat SPDMI- so voi SPMI- thirirng la chieu (ia> mang tam cd the thay ddi dugc theo y mudn.
Hon nira, pha tTnh dugc tam Ic-n thanh biiii Irong cua kim rdng do dd co the tranh dugc nhirng tac dpng ca hoc lam hicn dang va dc hong mdng tam nhu trong kT thudt SPME thudng [I].
C ling can chii y rang khi lam chieu clay mdng lam qud ldn Idm tdng lugng chdt chiet dugc, dan den dp nha\ cua phucmg phap tang ICMI. I iiy nhic'n khi chieu ddy mdng lam qud Idn lam cho phdn rcing cua kim sau khi lam nho lai, lugng mdu (khi hoac long) tiep .xiic true tiep vdi mdng pha iTnh bj ban che. Idm keo ddi thai gian dat trang thdi cdn bdng phdn bd. Cdn khi tdm vdi chieu day mdng tdm qud mong se khci khan de dat dugc hieu qua \ i chiet nhu mong mudn. Vdi duorng kinh trong ciia kim tiem trudc khi tdm Id 0,38 mm \ a chieu ddy mdng pha tTnh ( 0 \ -17) 22 pm (theo quan sdt bdng kinh hien vi dien tu) thi ducrng kinh phdn rdng sau khi tdm vdn cdn la 0,336 mm, dii Icin de cho lugng mau cd the tiep xuc \ d i pha iTnh. Chieu ddy mdng tdm 22 pm vdi cdc chdt hidrocacbon tham nhdm BTEX, thdi gian dat trang thai cdn bdng phdn bd ttong mdu khi 15 phiit vd trong mdu long 10 phiit la hodn todn ed the chdp nhdn dugc vdi mdt kT thudt xir li mdu cho phdn tich sde ki.
3.3. Quy trinh phan tich trong khong gian hoi mau Idng
Tren ea sd khdo sdt cdc yeu tc") dnh hucmg den kT thual SPDME \di cac hidrocacbon tham nhdm BTEX trong nude ket hgp \di sde ki khi CiC FID, quy trinh phdn tich dugc dua ra nhu sau:
Thiet bi SPDME: Pha iTiih OV-17
Lay 10 mL mau long vao Ip 14 mL co nut kin, them 4 gam Na2S04, khuay 100 vong/phul, d nhi?t dp phong
\ i chiet tren KGH mau trong lOphut^
C ac chat phan tich dugc giai
hap tai dau injecta cua may
GC uong 30 giay
Ket qud khdo sdt dp thu hdi cua phuang phdp vd dp dyng quy trinh ndy vdo phdn tich mdt sd mdu nude thyc te d quanh khu vye Hd Npi cho kit qud nhu d bdng 1 vd bdng 2.
Xac dinh nhdm hidrocacbon tham btex trong nw&c vS khdng khi bSng phwang phap ...
Bdng 1. Xac djnh do thu hoi ciia phuang phap
Ten chat Benzen Toluen Etylbenzen
m-xilen
CxlO-^g/ml) 8,78 8,67 8,66 8,60
Nong dp tim thdy (x 10"''g/mL) Lan 1
S,36 S.32 8,17 8,27
Lan 2 8,70 8.45 8.38 8,37
Lan 3 8,62 8,39 8.24 8,25
Lan 4 8,51 8,48 8,31 8,23
1
TB 8,55 8,41 8,28 8,28
H (%) 97,38 97,00 95,61 96,28 Bdng 2. Ket qua phan tich mpt so mau long thyc te
Ten chat Benzen Toluen Etylbenzen m-xilen
Nong dc) cac chat (x 10"''g/inL) Mau 1(M1)
(-) 842.26
(-) (-)
Mdu 2(M) (-) (-) (-) (-)
Mau3(M3) (-) (-) (-) (-)
Mau4(M4) 37,51
(-) 221,48
(-)
Mlu 5(M5) (-) (-) (-) (-) Ghi chit:'"-" la khong phat hien dugc chat trong mau. Mau 1: Nha may Son tong hop Ha Npi;
Mau 2: Cong ty co phan thuong mai Viglacera;
Mau 3: Xudng San nude - Vien Hoa hpc cong nghiep Viet Nam; Mau 4: Cong ty diet 8-3;
Mau 5: Cong t\ San xa Cau Dien, Tir Liem, Ha Npi.
Trong gidi ban phdt hien eua phuang phdp d dieu kien nghien ciru vdi cdc chat nhom BTEX trong nude Id 4,3 x 10' g/mL. Kit qud phdn tich mdt so mau thyc tl cho thdy khdng phdt hien dugc cdc chdt nhdm BTEX trong mdu M2, M3 vd M5. Toluen co d Ml vdi ndng dp 842,26 x 10"^
g/mL vd M4 phdt hien dugc benzen 37,51 x 10'^ g/mL, etylbenzen la 221,48 g/mL (tinh dugc tir phuang trinh phdn bd). Ddy Id kit qud phdn tich kilm chiing phuang phdp^ do do sd lugng mdu con ban chl, sd lieu mang tinh cue bd. Hom niia, cdc hgp chdt nhdm BTEX dl bay hai nen ndng dp cac chdt phy thudc rdt nhilu vdo thdi gian ciing nhu dia dilm Idy mdu khdc nhau.
3.4. Quy trinh phan tich mau khi
Mdt trong nhirng khd khdn gap phdi khi xir li vdi mdu khi dd Id tinh khdng In djnh vd cdn he thing Idy mdu phuc tap. Tuy nhien, vdi viee khdo sdt dugc cdc dilu kien tdi uu cho kT thudt SPDME kit hgp vdi sdc ki khi GC/FID, tren ddi ttrgng la cdc hidrocacbon tham nhom BTEX, quy ttinh phan tich dugc xdy dung dan gidn nhu sau:
Thilt bi SPDME: Pha tinh OV-17
Mlu khi dung trong binh 1 lit co van khoa hai chieu va giir d nhiet dp phong
Vi chiet trong thdi gian 15 phiit,
toe dp keo- ddy pittong
la 30
Chat phan tich dupe giai
hap tai dau injecto cua
may GC trong 30 giay
Nguyin Dwc Hu$, Trin M^nh Tri, Dd Quang Huy, DSng Van Doan
Hani:, 3. Kcl qua phiin lich mpt so mau khi thyc tc
Mau Ml M2
.
M3 M4 M5
1 -
M6 R VSLO TCVN 5940:1995
TCVN 5938:1995
TBND 1-LTD
1 Ben/en
4,0*) 2,60 5,63 5.51 1,49 5,00 80,00
0,1 1.5
lam lircrng cac chat tinh theo mg/m Toluen
17,34 17,04
100,00 750,00
0,6 0,6
Etylbenzen
4,94
m-Xilen 11,56 13,40 34,02 42,60
i
1 100,00 870.00 870,00
Trong bang: TCVSLD: 1 leu chuan vc sinh lao dpng s6 3733/200/QD- BYT (mg -^i ).
TCVN 5940:1995: Gidi han thai tii da cho phcjp ciia cac chdt BTEX vao ktiony khi.
TCVN 5938:1995: N6ng dp toi da cho phep cua cac chdt nhom BTEX uong khdng khi xung quanh.
TBNE): Trung binh nga\ dem; 1 -LTD: mpt lan tii da; "-": Khong phat hien dupe
Ou\ trinh sau khi xa> dung dugc dp dung de phdn tich mdt so mdu thuc te: Khdng khi t^i xudng sdn xudt son Vien Hod hpc cdng nghiep Hd Ndi (Ml): Khdng khi tai xuomg sdn xudt son. Cdng ty cd phdn son Hd Ndi (M2); Khdng khi tai gdn cdng thai Cdng t> cd phan son Ha Ndi (M3); Khi thai tryc tilp tir dng xd xe mdy Wave Trung Qudc sau 2 ndm su dung (M4); Khi thdi tryc tiep tir dng xa xe mdy Wave Thdi Lan sau 2 ndm su diing (M5) vd khdng khi xung quanh khu vuc cdy xang so 1- Luong Yen, Hai Bd Trung, Hd Ndi (M6), ket qua thu dugc nhu d bang 3.
Ket qud phdn tich cho thay, benzen cd a hdu bet cdc mdu, dieu na\ ciing dl hieu bdi day la dung mdi hixu ca dugc dung nhieu trong ngdnh cdng nghiep son. Hon nura, benzen eiing Id thdnh phdn ed mat nhieu trong khi thai ciia cac dpng ca xdng ddu, nhdt Id nhiimg ddng ca cd chat lugng kem. Cdc mdu khi Idy trye tiep tir cdc xudng sdn xudt son \ a khu wxc cdng rdnh chiia hdu bet cdc thdnh phdn thugc nhdm BTEX, do ddy la cae ca sd sdn xudt son nude, dung mdi dimg Id cdc hidrocacbon thom. Mac dii ket qud mang tinh cue bd \ a d mdt thdi diem nhdt djnh nhung cd the nhdn thdy cdc hidrocacbon tham nhdm BTEX xdc djnh dugc van ndm dudi gidi ban tdi da cho phep (tieu chudn ve sinh an todn lao dpng) trong tdt cd cdc mdu [1].
4. KET LUAN
Nghien ciru da che tao thdnh cdng thiet bj vi chiet pha ran ddng sir dung kim rdng phu trong (SPDME) vd khdo sdt chieu day mang pha tTnh Id polimetylphenylsiloxan (OV-17).
Xdy dyng quy trinh phdn tich true tiep cdc hidrocacbon tham nhdm BTEX ttong mau nude vd trong khdng khi tren ca sd kT thuat SPDME kit hgp vdi sac ki khi GC/FID.
Xac dinh nhdm hidrocacbon tham btex trong nw&c vS khdng khi bSng phwang phSp
TAI LIEU THAM KHAO
1. Nguyen Due Hue, Nguyin Mai Dung, Trdn Manh Tri Nghien ciru phuang phdp vi chilt pha ran ttong khdng gian hai kit hgp vdi sdc ki khi (GC/FID) phdn tich nhdm hgp chdt BTEX trong nude. Tap chi Khoa hpc DHQG Hd Ndi, KHTN&CN 22 (3A) (2006) 66-73.
2. Chu Vdn Hdi, Chu Pham Ngpc Son, Phii Minh Tdn Phdn tich Benzene-Toluene-Xylene (BTX) ttong khdng khi xung quanh thdnh phd Hd Chi Minh, TuyIn tap cong trinh khoa hpc tai Hdi nghj khoa hpc phdn tich hod, li vd sinh hoc todn qudc ldn thii 2, 2005, tr. 276-278.
3. Nguyin Thj Thanh Hdi Nghien cim irng dung phuong phdp phdn tich sdc ki khi xdc dinh ndng dp benzen, toluen, xylen trong khdng khi mdi trudng lao ddng, Bdo cdo dl tdi nghien cuu khoa hpc, Vien y hpc lao dpng vd ve sinh moi trudng, Hd Npi, 2006.
4. United States Patent 6537827 Method and device for solid phase microextraction and desorption, from: http://www.freepatentsonline.com
5. Musshoff F., Lachenmier D. W., Kroener L., Madea B. - J. Chromatogr. A (2002).
6. Musshoff F., Lachenmier D. W., Kroener L., Madea B. Forensic Sci. Int.(2003).
SUMMARY
DETERMINATION OF THE BTEX GROUP AROMATIC HYDROCACBONS IN WATER AND IN AIR BY GC METHOD USING SOLID-PHASE DYNAMIC
MICROEXTRACTION (SPDME)
Solid-phase dynamic microextraction (SPDME) is a modified method of fiber solid-phase microexfraction (SPME). The method involves the sorption of analytes onto a thin film of stationary phase, which is coated on inner surface of a syringe needle followed by desorption of analytes fi-om a sample into a chromatographie injector for analysis. A great advantage of SPDME over fiber of SPME, the SPDME is impossible to damage mechanically. In addition, the volume of the stationary phase of SPDME needle is larger than that of SPME fiber many times.
Relying on that, we can increase the amount of analyte and sensitivity of analytical method. The study on SPDME technique based on SPME is a new modification and conttibution to improve sample preparation technique for chromatographic analysis.
In this report, we present to make device for SPDME based on stationary phase of polymethylphenylsiloxane (OV-17) and veterinary syringe and study on the method of SPDME combined with the GC/FID and GC/MS for determination of the BTEX group aromatic hydrocacbons in water and in air.
