Nguyen Dfing Dire vo Dtg Tap chi KHOA HQC & CONG NGHE 122(08): 79 -
XAC 0INH KEM VA MANGAN TRONG CHE XANH THAI NGUYEN BANG PHlTONG PHAP PHO HAP THV NGUYEN Tl^F-AAS
Nguyin D5ng Dire'', Do Thj Nga^
'Tntdng Dai hgc Khoa hoc - DH Thai Nguyen.
^Trucmg Dai hoc Cong nghi Thong tin & Truyen thong - DH Thai Nguyen TOM T A T
Thfii NguySn I^ khu vyc san xufit che vfi c6 nhieu khu cong nghiep, khai thfic khoang san, do do nguon dfit, nudc sfin xuat nong nghiep gan khu cong nghiep, khai thac khoang san thudng bi 6 nhilm kim loai nfing [1]. Hien nay viec xac djnh ham lugng cac ion kim loai nang frong che xanh d Thai Nguyen con it dugc nghien cuu. Nhu cau kiem tra muc dp 6 nhiem che xanh bdi cac kim ioai nSng lfi rat can thiet. Vi vay viec nghien cuu xac dinh ham lugng Zn vfi Mn trong che xanh da dugc tiln hanh nhd phan tich pho hfip thy nguyen tu. Tu ket qufi thuc nghiem, chung toi thay mii-c dp 6 nhilm cua Zn va Mn dlu dudi gidi han ciio phdp theo tieu chudn Viet Nam.
Tu" khofi; Zn. Mn. xdc dinh. kim logi ndng. 6 nhiem. lieu chudn Viet Nam.
DAT VAN DE
Hi?n nay vi?c xac dinh hfim lugng cac ion kim loai nang co trong che xanh a Thfii Nguyen con it dugc nghien cuu. Nhu cau kiem tra mirc do 6 nhiem che xanh bfli cfic kim loai nfing lfi rat can thiet. Vi vay, de sfin xuat che an tofin can khao sat dfinh gifi hien trang mpt sfi chi tieu kim loai nang trong che tren khu vyc nay. Chung tfli da nghien ciru '*Phirang phdp pho hap thu nguyen tii- F- AAS xdc dinh hdm lirang Kent vd Mangan trong che xanh & Thdi Nguyen". Trong bfii bao nay chiing toi giflfi thieu cac ket qufi nghien ciiu Zn, Mn trong che xanh thugc 20 xa Clia 7 khu vyc a tinh Thai Nguyen.
THl/C NGHIEM Hoa chat
- Dung djch chuan Zn''; Mn"' dimg cho AAS (lOOOppm, Merck).
- Axit d^c HCI 36%; HNO., 65%; H3O2 30%
(Merck).
- Dung dich cfic cation kim loai tinh khiet (PA).
- Dung djch rira sufocromic (hfln hgp H1SO4 dfic vfi KjCrjO,).
D^ng cu
- Coc thuy tinh lo^i 50; 100; 150; 500 ml.
' Tel 0912 477836. Emad ducptl989(3igmail a
- Binh djnh mirc: 10; 25; 50; 100; 250; 500;
1000 ml.
- Pipetman: 0,5; I; 2; 5; 10 pi.
- Binh Kendal; lg dung mfiu 25 ml.
Trang thiet bi
May quang phfl hfip thy nguyen tu Shimadzu AA-6300.
- May xay; tii sfiy; tii hiit.
- May cfit nuac hai lan Aquatron A4000D.
- Cfin phfin tich.
Cfic trang thiet bi nay deu dugc thyc hien a phflng thi nghiem Khoa Hofi hgc- Trufl'ng Dai hgc Khoa hgc-DHTN.
KET QUA VA THAO LUAN
Khao sat cac dieu kien do pho F - AAS cua Zn vfi Mn, chiing toi thu dirge bang 1.
Khao sat cac yeu to finh hudng den phep do F-AAS
Khdo sdt anh hudng cua ndng do axit vd loai axit
Khao sal dnh huang cua axit doi vai Kenv Chiing toi tien hanh khfio sfit dfli vai dung djch Zn"' Ippm trong axit HCl vfi HNO3 vfl'i nflng dp bien thien tir I den 3%. Cac ket qufi dugc chi ra, nong dfl HCl, HNOi trong dung dich mau <3% khflng anh huang ten phep do phfl Clia Zn. Trong dfl nong dp HNO, 2% vfi HCl 1% cho k^t qufi cfl dg lap lai cao, fln dinh nhat
79
Nguyen Dang Due vd Dtg Tap chl KHOA HOC & CONG NOHE 122(08): 79-86 Bang 1. Tong kit cdc dieu kien do pho F-AAS
— . Nguyen t^
C4c yen to
Vach pho hap thu (nm) Khe do (nm) Thong Cuong do dong den (mA) so may Khi moi trufmg
Chieu cao burner (mm) Toe do dan khi axetylen Thanh Nong do HNOj (%)
phiin Nen mlu ( M o d i % ) Luong miiu nap (pi) Gioi han phat hien (ppm) Gioi han dinh huong (ppm) Vung tuyen tinh (ppm) Chuong trinh nguyen tii hoa 1 Say m l u
2. Tro hoa co RAMP
Zn 213,9
0,7 8(80%I™O
Argon 7mm 2Jit/phiit
2 Mg(NOj)2 0,Dl%
20 0,0465 0,1554 0,5-2,5 T("C) t(s) •
120 20 250 . 10 400 22 -10
cita Zn vd
T("C) 120 250 500
Mn
M n 279,5
0,2 1 2 ( 6 0 % I . „ )
Argon 7mm 2 lit/phdt
2 Mg(NO3)a0.01%
20 0,1263 0,4209 5-10
t(s)- 20 10 22-10 Khdo .sdt dnh hu&ng ciia axit doi vai
Mangan: Chiing tfli tien hanh khao sat dfli vfli dung dich Mn"""" Ippm trong cac axit HCl va HNO5 vfl'i nflng do bien thien tir 1 d^n 3%.
Cfic ket qufi chi ra nflng do HCI, KNO3 trong dung dich mau < 3% khong anh huflng to'i phep do phfl cLia Mn. Trong do nong do HNO_, 2% va HCI 1% cho kk qua cfl dp lap lai cao, fln dinh nhat.
Tiep theo chiing toi tien hanh khao sfit de chon ra trong hai Ioai axit HCl 1% va HNO3 2% thi Ioai axit nfio it anh huflng tfl'i phep do ciia Mn nhat bang cfich pha cac dung dich vfl'i nong do bien thien cua Mn trong cfic nong do axit da chgn. Ket qua cho thay HNO3 2% cho do hfip thu ctia nguyen to cao va cho ket qua on dinh trong phep do Mn {ling vai do thi cfl dp thang va do doc cao).
Vi vay trong qua trinh phan tich mau cfic nguyen to vfi Mn chiing tfli chgn n&n la HNO3 2%
Khdo sdt dnh hirdng cua cdc cation De kiem tra anh huflng, vai mfli nhflm cation chiing tfli chuan bi 5 mau bao gflm Zn"* I ppm hoac Mn"^ Ippm vfi hfim lugng cac cation K*, Na\ Mg-*. Ca'*. Ba^' Pb"", Cd^*„ Al^\
80
Cr ..,vai nong d^ tfing dan, djnh mirc va tien hfinh do pho thu dugc cho thay vai nong dg K^ (1500ppm, Na^ (1200ppm), Mg^' (200ppm), Ca^' (200ppm), Ba^^ (50ppm), A P " (50ppm), CH"(10ppm), Pb^^ (lOppm), • Cd * (lOppm), deu khong anh huong den pho F-AAS Clia Zn^^ vfi Mn^^
Khao sat s c bo thanh phan mSu Trong che xanh co rfit nhieu nguyen tfl tfln tai duo'i d^ng caion vfi anion. Can phai loai bo finh huang ciia cac nguyen t6 do den cuimg do vach pHo hap thu ciia Zn^"" va Mn"\ Tfic gia Dang Quoc Trung [2] da khfio sat thfinh phan mau vai ba mfiu che xanh dai dien cho 8 nguyen to bfing phuang phfip ICP - MS, k8t qua dugc dan ra a bang 2.
Xay dung duo'ng chuan doi voi phep do F-AAS
Khdo sdt khodng tuyen tinh
De xfic dinh khofing tuy^n tinh ciia Kem va Mangan, chiing toi chuan bi mgt day mfiu chuan co nflng dg bien thien tir 0,05ppm - 5ppm doi vai Kem vfi 0,5ppm - lOppm trong HNO., 2%. Kit qua thu dugc trong bang 2, 3 va hinh 1, 2.
Nguyin Eang Buc vd Dtg Tap chi KHOA HOC & CONG NGHE
!v6ngd$(ppm) 0,05
0,1 0,2 1 2 2,5 5
IVong d0 (ppm)
0,5 1 2 4 5 10 12
B i n g 2; Kit qud khdo sdt khodng
Lini 0,0173 0,0333 0,0624 0,2957 0,5224 0,6730 0,8989 BSng 3 : Ket qud
Lan I 0,0391 0,0782 0,1484 0,2856 0,3550 0,6562 0,7024
Aba Lani 0,0171 0.0326 0,0631 0,2953 0,5197 0,6692 0,8997
ndng do tuyen tinh cua Kem -Zn
Lan S 0,0172 0,0322 0,0605 0,2940 0,5137 0,6762 0,8999 khdo sdt khodng ndng do tuyen tinh
Abs- Ldn 2 0,0394 0,0781 0,1526 0,2868 0,3520 0,6578 0,7135
Mn Ldn 3 0,0390 0,0763 0,1493 0,2873 0,3534 0,6597 0,7019
Trung binb 0,0172 0,0327 0,0620 0,2950 0,5686 0,6728 0,8995
"ita Mangan
Trung binh 0,0392 0,0775 0,1501 0,2866 0,3535 0,6579 0,7059
%RSD 0,5814 1,7027 2,1699 0,3013 0,8587 0,5209 0,0588
0,5412 1,3807 1,4732 0,3052 0,4248 0,2663 0,9290 Qua do thj ta thay khoang nflng do tuyen tinh ciia Mn la 0,5 - 10 ppm
Hinh 1: Bo th\ khdo sdi khodng nong dg tuyen tinh khi xdc dinh Zn Qua dfl thi ta thay khoang nflng do tuy€n tinh ciiaZn la 0,05 - 2,5ppm
Hinh 3 : Duong chudn xdc dtnh hdm luong Zn
Hinh 2: D6 thj khao sdt khodng ndng dg tuyen
tinh khi xdc dinh Mn Hinh 4: Dudng chudn xdc dinh hdm luang Mn
Nguyin D3ng Due va Dtg Tap chi KHOA HOC & CONG NGHE 122(08): 79 - 86 Xay dung dirong chuan
De xfic dinh hfim lugng cac nguyen to Kem vfi Mangan trong mau phan tich bfing phuang phap duang chufin, chung toi chufin bi cfic dung dich de xay dung duflng chufin co nong do trong khoang tuy6n tinb cung moi tnrong axit vai dung djch mau phan tich. Kit qua xay dung thu dugc tren hinh 3 va 4, ngugc lai khi nflng do chat phan tich qufi nhfl thi ta phfii lfim giau mau truac khi do.
Danh gia sai sh va do lap lai ciia phep do D I danh gia sai so vfi do lap lai cua phep do, chung toi dung duong chufin, pha 3 mau co n6ng do a diem dfiu, diem giira, diem cuoi cua duang chufin trong cac dieu kien va thfinh phfin giflng nhu mau chuan. Thuc hien do moi mlu 7 lan. KSt qua thu dugc bilu dien trong bang4 va bang 5.
Bang 4: Kit qud sai so vd do lap lgi ciia phep do Kem Miu
Cz. (ppm) A,(Abs)
Lan do Lan 1 Lan 2 Lan 3 Lan 4 Lan 5 Lan 6 Lan 7 Aa,(Abs)
SD
%RSD A[
0,0173 0,0171 0,0170 0,0171 0,0170 0,0173 0,0171 0,0171
I 0,05 0,0172
1,29.10 0,7545
%X 0,5814 0,5814 1,1628 0,5814 1,1628 0,5814 0,5814
•'
1
A, 0,2952 0,2953 0,2949 0,2948 0,2951 0,2952 0,2949 0,2951
2 1,0 0,2950
1,91.10
%X 0,0678 0,1017 0,0339 0,0678 0,0339 0,0678 0,0339 1"^
0,0649
3 2,5 0,6728 A, 0,6723 0,6698 0,6729 0,6726 0,6730 0,6729 0,6726 0,6723
1,13.10
%X 0,0743 0,4459 0,0149 0,0297 0,0297 0,0149 0,0297 1'^
0,1678 Nhu vay, theo ket qufi khfio sfit cho thay do lech chuan va he so bien dgng (sai so tuong doi) cua phep do Kem nho va nam trong gicri ban cho phep (10%).
Bang 5; Ket qud sai so vddg lap lgi cua phep do Mangan Mau
CM»(ppm) A, (Abs)
Lan do Lan 1 Lan 2 Lan 3 Liin 4 Lan 5 Lan 6 Lan 7 /!,, (Abs)
SD
%RSD A, 0,0391 0,0393 0,0390 0,0391 0,0393 0,0390 0,0391 0.0391
1 0,5 0,0392
1,29. K
%X 0,2551 0,2551 0,5102 0,2551 0,2551 0,5102 0,2551
)"'
0,3302
A, 0,1506 0,1500 0,1503 0,1504 0,1500 0,1504 0,1502 0,1503
2 2 0,150 1
%X 0,3331 0,0666 0,1332 0,0665 0,1332 0,1998 0,0665 2,24.10''
0,1488
3 5 0,3535 A, 0,3540 0,3531 0,3534 0,3538 0,3532 0,3534 0,3540 0,3536
%X 0,1414 0,1132 0,0283 0,0849 0,0849 0,0283 0,1414
3.76.10'*
0,1064 Nhu vay, theo ket qufi khfio sfit cho thfiy dp lech chuan vfi he sfl bien dgng (sai so tuong dfli) ciia phep do Mangan nho va nam trong gifl'i ban cho phep (10%).
Nguyin Dang Dlic voO/g Tap chi KHOA HOC & CONG NGHE 122(08): 79-86 Xac djnh Zn va Mo trong che xanh soi nh? trong vong 2 gio de mlu phan huy.
Bjtt aim thcri gian lay miu vaky hiiu miu Sau do, them tiSp 10ml HNO3 dac va 5 ml Cac mlu che xanh dugc lay tai 20 khu vuc H2O2 30% va dun soi them 2 gia niia. Them thupc 7 huyen trong tinh Thai Nguyen. tiip H2O2 30% dS du6i HNOj du, dun soi Chuan bi miu phan lich 131 cho din khi dung djch trong sudt. ChuySn Che xanh dugc lay a 20 khu vuc khac nhau toan bg dung dich vao coc 50ml va djnh Clia tinh Thai Nguyen. La che xanh tuoi nia muc blng. dung dich HNOj 2% trong binh sach, dugc phai ducri anh sang mat troi va sau aj„|, ^4^. jSmh Sau do dem do ph6 hip thu do say kho a 40 C, xay nho thu diroc bpt la . ,^ - - u - • -, n n - .* u - , . , , . . cua Kem o biroc song 213,9 nm va do pho che xanh kho. . ^ . f
hap thu nguyen tu Mangan o buoc song Can chinh xac 2,0 gam mau che kho da xay j ^ ^ j „ ^ ^ . , ^ ^ . ^ ^ . ^ , ; ^ ^ , ^ ^ ^^^^ ^ nhfl vfio binh Kendan, day binh bang pheu . 1 -,
lgc cfl dufli dai, them 15 ml HNO3 dfic dun
Bfing 6: Dia diem vd thai gian ldy mdu che TT
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Dja diem lay m i u
N h i Ong; Pham Van Xuat, xom Hong Thai 2 - xa Tan Cucmg Nha ong; Nguyen Van Tinh, xom Nam Thai - Tan Cuong Nha ba; Hoang Thi Nguyen, xom Nam Tan - Tan Cuong Nhi ong; Luang Van Hoa, xa Phuc Triu - TP Thai Nguyen Nha ba; Pham Thi Nguyen, xom Tan Son, xa Vjnh Son - T.X.SOng Cong
Nha ba; Ha Thj Xuan, x6m Trung Tam, xS Binh Son - T.X.Song Cong
Nha ong; Dinh Trung NghTa, xom 3 Thuan Dire, xa Mmh Due - Phd Yen
Nha ong: Hira Van Du. xom An Binh. xa Thanh Cong - huyen Phi Yen
Nha ong; Doan Trung, xom Yen Me. xa Hong Tien - huyen Pho Yen
Nha ba: Dang Thi Thu, xom Choi, xa MS Yen - huyen Dai TCr Nha ong: Le Hien, xom Ca, xa Ky Phu - huyen Dai Tu Nha ba; Dinh Thj Nhan. xom Hien Binh, xa La Hicn - huyen Vii Nhai
Nha ong: Nguyin Chi Dung, x6m Cao Bien, xa Phil T h u o n g - huyen V6 Nhai
Nha ong; Vu Thuan, x6m Ba Danh 1, xa Minh Lap - huyen D6ng Hy
Nha ba; Truong Minh Hien. xom Tam Thai, xa Hoa Thuong - huy?n Dong Hy
Nha ong: Nguyin Van Tien, xom Dong Tam, xa Dong Bam - huy^n D6ng Hy
Nha ba; Ho Van, xom Van Lucmg 1, xa Trung Luong - huyen Djnh Hoa
Nha ba; Tri?u Thj Chien, x6m Son Thang, xa Son Phu - huyen Djnh Hoa
Nha 6ng: Do Huy Blnh, xa Xuan TruOng, xa On Luong - huyen Phu Luong
Nha ong; L£ Xuan Hai, x6m D6ng Sang, xa Co Lung - huyen Phu Luong
Ky hifu HT N T - N T - P T - V S - B S - MD T C - H T - MY- K P - LH- P T - ML H T - T C - T L - S P - OL- CL
- T C - T C - T C -TN - S C - S C - P Y - P Y - P Y - D T - D T
•VN
•VN - D H DH -DH DH DH - P L - P L
Thoi gian lay mau
22/11/2012 22/11/2012 22/11/2012 22/11/2012 5/12/2012 5/12/2012 5/12/2012 5/12/2012 5/12/2012 15/12/2012 15/12/2012 15/12/2012 15/12/2012 20/11/2012 20/11/2012 20/11/2012 18/12/2012 18/12/2012 18/12/2012 18/12/2012
Nguyen DSng Diic vd Dtg T^p chi KHOA HOC & CONG NGHE 122(08): 79 - 86 Kit qud phdn tich cdc mdu che xanh
Sau khi xir ly 20 mau che xanh thugc 7 khu vuc ciia tinh Thai Nguyen, chiing toi tien hanh do phfl hfip thu F - AAS dfli vai Zn va Mn trongnhiing di6u kien da chgn [4]. Hfim lugng Kem va Mangan thu dugc trong bang 8.
Bfing 7: Ket qud do pho hdp thu nguyen tir cua Kem vd Mangan
T T 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
iWlu HT-TC NT-TC NT PT-TN VS-SC BS-SC MD-PY TC-PY HT-PY MY-DT KP-DT LH-VN PT-VN ML-DH HT-DH DB-DH TL-DH SP-DH OL-PL CL-PL
B o h a p Zn 0,2368 0,2310 0.2105 0,1442 0,1245 0,1531 0,1359 0,1428 0,1298 0,1762 0,1773 0,2450 0,2331 0,1536 0,2408 0.1543 0,2333 0,1069 0,1967 0,2038
thu IVIn 0,1391 0,1167 0,0997 0,1104 0,1065 0,1216 0,0886 0,1307 0,1482 0,1269 0,0739 0,0956 0,1168 0,1460 0,1328 0,0792 0,0985 0,1290 0,1373 0,1232
Nong Zn 0,8003 0,7671 0,7652 0,4830 0,4155 0,5020 0,4842 0,4857 0,4377 0,6012 0,6219 0,8120 0,7956 0,4978 0,9021 0,5209 0,7883 0,3552 0.7053 0,7107
d o (ppm) IMn 2,0978 1.7523 1,2050 1,6006 1,5947 1,7668 0,9857 2,0021 2,3145 1,8142 0,8683 1,0052 1,6380 2,2251 2.0046 0,8795 1,1036 1,8423 2,0878 1,8283
H a m luvng (mg/kg) Z n 10,0038 9,5888 9,5650 6,0375 5,1938 6,2750 6,0525 6.0713 5,4713 7,5150 7,7738 10,1500 9,9450 6,2225 11.2763 6,5113 9,8538 4,4400 8,8163 8.8838
Mn 26,2225 21,9038 15,0625 20,0075 19,9338 22,0850 12,3438 25,0263 28,9313 22,6775 10,8538 12,5650 20,4750 27,8175 25,0575 10,9938 13,7950 23,0375 26,0975 22.8538 Bang 8: Ket qud do mdu che an todn
TT 1 2
Mau chf xanh Hong T h a i ; Nam Thai -
' - Tan Cuong Tan Cuong
Do hap thu 0,1391 0,1167
Nong do (ppm) 2,0978 1,7523
H a m lu'gng (mg/kg) 26,2225 21,9038 Tir ket qua ham lugng cua Zn trong bang 7,
chung toi dem so sanh vo'i tieu chufin tai QuySt dinh sfl 46/2007/QD - BYT ngay 19 thfing 12 nam 2007 (tieu chuan tfli da cho phep Kem trong che la 40mg/kg ). Ham lugng Kem trong 20 mau che xanh deu nho hon gidi han toi da cho phep. Vi chua co tieu chuan nao quy dinh ve giai ban hfim lugng cho phep cua Mangan trong che xanh, do do chiing tfli chgn 2 mau che an tofin de so sanh vai cac mau che khac cua khu vuc Thfii Nguyen.
Xflm Hflng Thai 2 - xa Tan Cucmg, Xflm Nam Thai - xa Tan Cuong. Day la hai don vi dau tien ciia cfi nufl'c duac to chirc IFOAM (Intemational Federation of Organic Agriculture Movements) vfi to chiic ICEA
(Insulated Cable Engineers Association) cfip giay chung nhan san pham che sach theo tieu chuan chau Au. KSt qufi phan tich thu dugc b bang 8.
Ket qua hai mau che an toan co ham lugng Mangan la 26,2225 (mg/kg) va 21,9038 (mg/kg). Chiing toi chgn ham lugng Mangan la 26,2225 (mg/kg) ciia xom Hflng Thai 2 - xa Tan Cucmg dfl so sfinh thi thay da sfl cac dia diem ma chiing tfli lay mau dSu co ham Iugng Mangan nho han so voi mfiu che an toan. Nhung 6 dia diem Hong TiSn - Pho Yen;
Minh Lap - Dflng Hy cfl ham lugng Mangan Icn ban so voi mau che an toan la 1,10 va 1,06 lfin cao ban khong dfing ke nen khong anh hucmg d8n sue khoe nguai su dung.
Nguyin DSng Due
-. Mau chf
1 TSn Cuomg 2 Ph6 Yfn
^ M3n chf
1 Phue Triu
vdDtg Tap chl KHOA HOC & CONG NGHE 122(08); 79 - 86 B i n g 9: Ket qud phdn tich mdu them chudn
N6ng d9 (ppm) 0,8003 - 0,4842 - Bang 10 N6ng (pp-n) 1,6006 - 1,0052
Ndng do them vao (ppm)
0,5 2 0,5
2 1; Ket qud phdn
Nong do them vao (ppm)
0,5 2 0,5
2
Nong do them vao thu dirge
(ppm) 1,2886 2,7912 0,9535 2,4671
cua Kem Nong do tbu duoc theo PP thf m chuin
(ppm) 0,7886 0,7912 0,4535 0,4671 tich mdu them chudn cua Mangan
Nong do them vao thu duoc
(ppm) 2,0520 3,4983 1.4302 2,9720
Nong do thu dirge theo phumig phap them chuan (ppm)
1,5520 1,4983 0,9302 0,9720
Sai so
(%)
1,4619 1,1371 6,3404 3,5316
S a i s 6
(%)
3,0364 6,3914 7,4612 3,3028 Mdu thim chudn
Chgn hai mau che dai dien de tien hanh ifim bfing phuong phfip them chuan. Dfli vai Kem chiing toi chgn Hong Thfii - Tan Cucmg;
Minh Dire - Phfl Yen. Dfli vfli Mangan chiing toi chgn Phuc Triu - Thfii Nguyen; La Hien - Vo Nhai. Doi vfli moi mau thi chung toi them nhirng lugng Kem vfi Mangan nhat djnh a diem dau, diem giiJa vfi diem cuoi cua duong chufin.
Ket qua dugc dfin ra a bfing 9 va bfing 10.
Nhu vfiy, qua ket qufi thu dugc a bfing 9 vfi bang 10 cho thay sai so giti-a hai phep do xac djnh Zn va Mn nho hon 10%.
Vi vfiy, phep do F - AAS da cho ket qufi nghien ciru la dfing tin cay.
KET LUAN
Bfing phuang phfip phfl hap thu nguyen tii F - AAS xfic dinh hfim lugng Kem va Mangan trong che xanh ciia 7 khu vuc thugc tinh Thai Nguyen, ham lugng Kem deu nho hem giai hgn cho phep lfi 40mg/kg ciia Quyet dinh so 46 /2007/OD - BYT ngfiy 19 thfing 12 nam
2007 Hfim lugng Mangan trong cfic mau che xanh deu nhfl ban so vai mfiu che an tofin vfli ham Iugng Mangan lfi 26,2225 (mg/kg), rieng fl dia diem Hflng Tien - Pho Yen; Minh Lap - Dflng Hy cfl ham lugng Mangan trong che Ion ban so vo'i mfiu che an toan la 1,10 vfi 1,06 lan, nhung vfin khflng finh huflng den sirc khoe nguai sir dung.
TAI LIEU THAM KHAO 1. Trinh Thj Thanh (2003). Doc hpc moi trudng vfi sijc khoe con ngucri Nxb - DDHQG Hfi Npi 2. DSng Qii6c Trung (2011), Lufin vSn thac sT, Xdc dinh Asen Irong che xanh a Thdi Nguyen bdng phuang phdp pho hdp thu nguyen tu. Truong Dai hoc S u p h a m - D H T N .
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Nguyin Dang Due va Dtg T?p chi KHOA HQC & CONG NGHE 122(08): 79 - 86
SUMMARY
DETERMINATION ZN AND MN CONTENTS EV GREEN TEA EV THAI NGUYEN BY ANALYZING ATOMIC ABSORPTION SPECTROMETRY
Nguyen Dang Due'', Do Thi Nga^
'College of Science — TNU.
^College of Information and Commumcalion Technology - TNU At present, the determination of heavy metan ions in green tea in Thai Nguyen has not been studied much. The demand for cheking pollution level made by above heavy metals m carried out and reseach to determinate contents of Zn and Mn in green tea in Thai Nguyen. So the study of the determination of Zn and Mn in green tea have been conducted by analyzing atomic absorption spectrometry. From the result of experiment, the pollution of Zn and Mn there belover than more compared with Viet Nam Standars.
Key words; Zn. Mn determination, heavy metal, pollution, Viet Nam standars
Ngdy nhdn bdi:0I/3/20I4. Ngdy phdn bien: 15/3/20N; Ngdy duyet ddng: 25/8/2014 Phdn biin khoa hoc: PGS TS Nguyin Duy Luang - IHH KHKT tinh Thdi Nguyen
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