V I:eN K H O A H O C CBA v A C O N G N G H :e V I:eT N A M V IE T N A M ACADEMY O F S C IE N C E A N D • T E C H N O L O G Y (V A S T ) • • , A t "" KY NIEM NAM VI~N KHOA HOC vA CONG NGH~ VI~T NAM • TIEU BAN: KHOA HOC CONG NGHE BIE'N H it N Q i, 2010 H (J i n g h i K h o a h C IcY n ie m ihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA 35 n d m V i¢ n K h o a h C va C n g n g h ¢ V i¢ ! N a m - H a N (J i 1 M l}C Ll}C U JI N O I D A u M O T SO D A c D IEM TH U Y V A N , D O N G Q uA K H A o SA T, N G H IEN cuu i.uc B IEN V Il;:T N A M Q U A cA c B ui H A ng Long K ET 10 D IA C H A T V A TIEM N A N G K H O A N G SA N B IEN D O N G N guy~n Th~ Tiep, N guy~n B i~u, N guy~n Th~ H ung, Tr~n V an Tri M O T SO K ET Q uA N G H IEN cuu 21 V E B IEN vA C O N G TR iN H B IEN N guy~n D ong A nh, D inh V an M anh CBA 32 xA c D lN H R A N H o r o t N G O A I TH EM LV C D IA V Il;:T N A M (PH A N PH IA B A C ) TH EO K H IA C A N H K Y TH U A T TS D C hi~~ Th~ng, TS N guy~n Th~ Ti~p, TS Phung V an Phaeh, ThS D olin Th~ H ung, ThS Tdn A nh Tuan, ThS Tr~n Trcng L~p TS H oang V an V U 'Q 'ng, 43 M O H iN H Q U A N L Y TO N G H O P V U N G B d B IEN a V Il;:T N A M Tr~n D are Tha , guy~n fru if r • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 55 K ET Q uA N G H IEN cuu SIN H V A T B IEN D O N G V IB T N A M , D E xu A T M O T SO PH V dN G H V dN G N G H IEN crru TR O N G N H U N G N A M TIEP TH EO D C fm g Thung 66 xA Y D V N G vA TH U N G H IEM cA c H E H O N H dP PH O I TR O N V dI N A N O Si0 PH V C V V TA N G C V dN G NAM RONG N guy~n PhU 'O 'ng Tung, Le K im H ung, Pham va N guy~n B ao Lam , C H A T H O A T D O N G B E MATI TH U no: D A u TA l M O D O N G D uy K hanh, Le Thi N hU ' Y, V an Thanh K hue 77 D A N H G IA D O N G U Y H IEM D O N G D A T vA SO N G TH A N V U N G V EN B IEN V A H A l D A o V IET N A M V A D E X U A T cA c G IA I PH A p U N G PH O V A PH O N G TR A N H B ui C one' Q u~(I), N guy~n D inh X uyen'", N guy~n H A ng PhU 'O 'ng(I), Tr~n Thi M y Thanh(l), Pham V an Thl}e(2), N guy~n V an LU 'o'ng(2),Tr~n Tuan D iing(2), Phan Trong Trinh(3) 89 B A N D O K IEN TA O - D IA D O N G LlJC V U N G B IEN N G O A I K H dl N A M TR U N G B O vA pH vcA N Phung V an Phaeh, D C hi~n Th~ng, N guy~n Th~ Ti~p, H oang V an V U 'Q 'ng, D U 'O 'ng Q uae A nh Tuan, Tr~n V an K h3, N go B ich H U 'O ng, Trinh H oai Thu 98 H ung, Tdn 10 N G H IEN cuu C H I TIET D A c D IEM cA u TR U C TA N G TR A M rtcn TR EN K H U V {jC TH EM LV C D IA M IEN TR U N G V IB T N A M V A K E C A N TR EN co SO X U L Y V A M IN H G IA I TO N G H dP TA l LIEU D IA V A T L Y - D IA C H A T K IEN TAD H oang V an V U 'O 'ng, D o~n Th~ H U 'ng, TrA n V a~ K 11 D A C D IEM X O I La, H O LO C EN - H IB N D A I ::t T·len ;' H '·ai,* N guyen ~ B O I TV V A TIEN H O A V U N G D ::t C 'an h D uong ** : cu A SO N G 103 LA M TR O N G 110 12 D A N H G IA D IA C H A N K IEN TA O vA SO N G TH A N TR EN B IEN D O N G vA LA N CAN ISB N : 978-604-9 I 3-0 15-1 T id u b a n : K h o a h o c c o n g n g h e B ie n ihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Ph an Trong Trinh\ N guy~n V an H uong', V u Thanh C a CBA , C U M inh H oang\ l H oang Q uang V inh\ B ui V an ThO 'm \ B ui Thj Tbao 13 N G H IEN cU D D IA C H A T B IEN V II;:T N A M B A N G PH U O N G N O N G PH A N G IA I C A O TA l V II;:N D IA C H A T - D 1A V A T L Y B IEN N go V an Liem ', 117 PH A p D IA C H A N D urrng Q uA c H ung 123 14 M O T SO D A c TR lfN G PH A N B O TR A M rtcn B E M A T TR EN PH A N C H A u TH O N G A M V EN B O B IEN D O N G B A N G SO N G C U U LO N G N guy~n Trung Thanh(l), Phung V an Phach(l) ,N guy~n 15 D A C D IEM D IA H IN H vA TR A M rtcn Pham B a Tru~g, Trjnh H A ng U in(l), D aniel U nverricht" 129 D A y V IN H cA N A Th~ H i~u, N guy~n D inh D a~, TrA n V an B inh 134 16 N H A N TH U C C O B A N V E TA l N G U Y EN V I TH E B IEN V II;:T N A M Tran u-c Th~n, guy~n H li'u C i'r, r~n lnh L ~iJn ••••••••••••••••••.••••••••••.••.•••••.•••••••••••••••••.•• 17 R EM O TELY SEN SED D A TA A N A N LY SIS O F LA N D U SE EN V IR O N M EN T A SSESSM EN T O F SEA PO R T D EV ELO PM EN T: H A IPH O N G , V IETN A M FO R STR A TEG IC C A SE STU D Y O F Tran D inh Lan and N guyen V an Thao 18 M O T SO V A N D E Q U A N LY M al B IEN G IO I K A LO N G 141 146 TR U O N G vA TA l N G U Y EN V U N G C U A SO N G D inh V an H uy 151 19 N G H IEN C U D SU C TA l M al TR U O N G SO N G B A C H D A N G C ao Thi Thu Trang, N guy~n Th] 20 V E cA c PH U O N G PH A p V U N G B IEN V II;:T N A M Phuong H oa 162 TIEP C A N B A a vs TA l N G U Y EN M al D u V an Toan TR U O N G 169 21 N G H IEN C U D D A C D IEM B IEN D O N G M 1!C N U O C B IEN D 61 K H I H A u H II;:N D A I B IEN TR aN G N guy~n K im V inh D IEU K II;:N 174 22 C H A T LU O N G TR A M TiC H TR aN G HOA M O T SO D A M TV B IN H D IN H D EN K H A N H Le Thj V inh 181 23 U N G D l)N G K IEM D lN H D O C TO TR aN G TR U O N G B IEN V II;:C D A N H G IA C H A T LV O N G M al V O H iii Thi, N guy~n Tac A n, 186 24 D A N H G IA K H A N A N G rtcn ru K EM V A TH U Y N G A N C U A N G H EU B EN TR E (M E R E T R IX L Y R A T A ) V U N G C U A SO N G B A C H D A N G TR aN G PH O N G TH i N G H II;:M Le X uan Sinh, D ~ng K im C hi, Tr~n D uc Thanh 25 N G U Y C O rtcn V EN B O V II;:T N A M D lfO 'ng Thanh ru PO L Y C H LO R B IPH EN Y L N ghi, Pham 26 H IB N TR A N G vA xu 192 TR aN G Thj K ha, C ao Thj Thu Trang, M O T SO SIN H V A T B IEN Le V an N am TH E B IEN D O N G C H A T LU O N G N U O C PH A M IEN TR U N G V II;:T N A M Luu V an D i~u 199 H I;: TH O N G D A M 205 27 D A C D IEM PH A N B O cA c D A c TR lfN G SO N G TA l V U N G B IEN C U A LA G I (B IN H TH U A N ) V A TA c D O N G C U A C H U N G D EN Q uA TR IN H X O I L6-B O I ru ISBN: 978-604-913-015-1JIHGFE t u « onmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA ban: Khoa h9C cong nghe Bidn yxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA DANH vA 'r t c n T V K E M THUY G I A K H A N A N G RQPONMLKJIHGFEDCBA BEN TRE (MERETRIX LYRATA) TRONG Le X uan PHONG VUNG CUA NGAN SO NG CUA NGHEU B~CH DANG T H i N G H I:¢ M S in h , D ~ n g K im C h i, T d n D u 'c T h ~ n h Vien Tai nguyen va Moi tnrong bien 246- Duong Da Nang - Hai phong Email: sinhlx@imer.ac.vn T o m tit: Cua song Bach D{mg hang nam tiip nhdn mot luong chat thai rat Io n , dac biet la kim loai ruing nhu thuy ngdn, kem Danh gia nguy co tich liiy kem va thuy ngdn loai dong V(Jthai manh v a ' khu v~c cua song Bach Dang a€ xem mice a(j nhiim cac chat ao rat can thi€! Trong nghien cuu nay, p h u a n g p h a p "Thi nghifm tinh khiing thay nutrc" sir dung ngheu Meretrix lyrata b6 tri cung mot dung d ic n a(jc t6 thai gian Kit qua cho thdy la: H? s6 tich liiy tram tich vung sinh vdt BSAF cua Hg la 1,91 kg tt/kg mo, cua Zn la 1,37 kg tt/kg mo H? s6 tdp trung sinh h9C BCF cua Hg la 24,26 L/kg mo cua Zn la 25,58 L/kg mo Vai tro chi thi sinh h9C cua ngheu vai thuy ngdn, kem khd rii vi kha ruing tich liiy ham IU(YngHg va Zn rat cao mo so voi moi tr u o n g tu nhien A b str a c t: This paper focuses on the assessment of accumulation of Hg and Zn in Hard clam (Meretrix lyrata) at Bach Dang estuary area where are polluted trap Annual years, amount of pollutions from continent discharge in environmental area very much We choose Experimental research by Static non-renewal test in 07 days period The accumulation of contaminants in tissues of living organisms is usually expressed as the BCF and BASF Coefficient BSAF of Hg (1.91 kg sediment dry/kg tissue dry) is higher 1.4 times than BSAF ofZn (1 37kg sediment dry/kg tissue dry) Result of experiment lab show that BCF ofZn (25.58 L/kg tissue dry) is higher 1.05 times than BCF of Hg (24.26 Ukg tissue dry) Role bioinstruction of hard clam (Meretrix lyrata) with heavy metal (mecury, zinc) is clear Keywords: Bioconcentration factor (BCF); Biota-sendimen accumulation factor (BSAF); Interim sediment quality guidelines (ISQG); Polluted trap; Static non-renewal test M iY D iu Cira song Bach Dang hang nam tiep nhan mQt hrong IOn cac chat thai tir nguon luc dia voi ham hrong cac ch~t a nhiem thuong xuyen virot qua mire gioi han cho phep, D€ danh gia cac tac dQng cua cac ch~t a nhiem d6i voi moi tnrong theo quan diem cua dQc hoc moi tnrong thi cAn phai xem xet kha nang thich irng cua sinh v~t voi moi tnrong khu V\IC hien tai Vung cira song Bach D~ng la vung cira song hinh phSu (estuaries) diroi tac dQng cua qua trinh song va bien, vung cira song Bach D~ng tao cac dang dia hinh phong phu va da dang: biii trieu rong voi h~ thong lach trieu d~y d?c [7, 8] Nen tai day t~p trung dien tich Ian cac khu V\fC nuoi thuy san nhu bai ngheu, d~m nuoi tom, V.V , d?c biet la t~p trung nhieu bai nuoi loai nhuyen th€ hai manh vo Ngheu duoc chon lam d6i nrong nghien ciru vi la loai an IQc va it di chuyen Ngheu cling la d6i tUQ11gdS thu m~u, dS nuoi cac b€ thi nghiern va it chiu tac dQng.khi thay d6i moi tnrong song dQt ngot [1, 5] 192 H9i nghi Khoa h9C JIHGFEDCBA kY niem yxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA 35 ndm Vi¢n Khoa h9C va C6ng ngh¢ Viet Nam - H a N9i 1012010 K€t qua nghien ciru danh gia vai tro chi thi sinh hoc cua ngheu B€n Tre vung cira song Bach D~ng d6i voi mot s6 kim loai nang nhu (Hg, Zn) Tai Li~u va Phuong Phap 2.1 Tili Ii?u Tai lieu da duoc thu thap tir nhi~u nguon khac lien quan d€n khu V\IC (hinh 1), gom cac s6 lieu quan tr~c moi tnrong thuoc cac d~ tai v~ khu V\IC cira song Bach D~ng cua Vien Tai nguyen va Moi tnrong bien, Dac biet la nguon tai lieu di~u tra, khao sat va thi nghiem nr luan van thac sy "Danh gia kha nang tich tu thuy ngan (Hg) va kern (Zn) ngheu M lyrata a khu V\IC cira song Bach D~ng" [5] 2.2 P h u o n g p h iip MQt h~ phuong phap nghien ciru v~ danh gia moi tnrong da duoc su dung, bao g6m cac phuong phap truyen thong nhu: thu thap va xuRQPONMLKJIHGFEDCBA I f thong tin, di~u tra khao sat thuc t€ va phan tich m~u v~t phong thi nghiem [9] - Phuong phap thi nghiem tinh (Static test) v~ dQc tinh theo USEP A (2002a) Trong thi nghiem tinh dung phirong phap thi nghiem tinh khong thay mroc su6t qua trinh thi nghiem [11, 12] + C, la ham hrong KLN ngheu tiroi thu tai bai (mg/kg kho) C s la ham hrong KLN tram tich thu tai bai (mg/kg kho) + C, - C tO la ham hrong KLN ngheu tich 1\1 bao hoa qua trinh thi nghiern, + + C tO la ham hrong KLN ngheu tich tu bao hoa tir moi tnrong ban d~u C', la nong dQ KLN thi nghiern tai ngheu tich tu bao hoa + Chu y: VI ngheu aii tich tu mot ham luong KLN tu moi truong (C to ) thu mdu nen a€ tich h¢ s6 tinh tu BCF giai doan thi nghiem thi p h a i loai tric y€u t6 ndn (C to ) ~ - ? '~ - - - - - : ! : e '- - '- - - - L - '- " , - - - - = = - - - - - = = - - - - - - - I Hinh 1: Sa a6 khu V lf C nghien D6ng B a i Cu6i - huyen Cat CLm - xii Hai - Phuong phap tinh h~ s6 tich tu bang thirc nghiem: Theo huang dfr lieu tai hien tnrong va dfr lieu phong thi nghiem duoc su dung d~ tinh toan cac thong s6 M s6 tich tu sinh hoc (BCF), h~ s6 tich tu tr~ tich vung sinh v~t (BSAF) [4] - Phuong phap xac dinh tu6i ngheu theo dirong cong sinh tnrong cua TS Nguyen Huy Y€t va nnk, 1998 [10] K~t Qua va Thao Lu~n 3.1 Thiit lljp thi nghi?m d{k ta Zn, Hg dai vOi ngheu M Lyrata phbng thi nghi?m Thi nghiern duoi day duoc nghien ciru nr thang d€n thang nam 2009 Ap dung phuong phap thi nghiem tinh khong thay mroc hay b6 sung h6a chat Trong qua trinh nghien ciru nhan th~y rang nong dQ Zn, Hg them vao m~t di khong dang k~: tir 2,9 - 9,5% d6i voi Hg, 0,6 d€n 9,8 % d6i voi Zn [4] Nhu vay n6ng dQ Hg va Zn v~ dam bao cho qua trinh thi 193 ISBN: 978-604-913-015-1 Tiiu ban: Khoa h9C c6ng ngh¢ Bien yxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA nghiem Thi nghiem ti~n hanh b~ (trong mot b~ d6i chirng khong them dQc t6) Thi nghiem diroc ti~n hanh a di~u kien phong thi nghiem nhu sau: Nhiet dQ 25°C (dao dong nhiet dQ khong qua 1°C) Do pH va dQ man voi t~n su~t 2JIHGFEDCBA l~ n J RQPONMLKJIHGFEDCBA khong vao b~ dam bao oxy hoa tan va khuay tron mroc b~ thirc an d~ dang S \1 C giup ngheu 19C - Thu m~u mroc tai bai ngheu - Thu m~u ngheu tai hien tnrons cling kich thiroc 08 thang tuoi - Tha 08 ngheu/ b~ (m~t 70-\ 00 con/rrr') - Thi nghiern 03 b~ tai cung mot nong dO Kiem thich di~u kh6ng tra kha nang s6ng va nghi cua n g h e u kien thi nghiern them KLN B~ thi nghiem d6i chimg I ~ Be thi nzhiern I Be thi nzhiem I I Be thi nzhiern I - T~i nghiern 07 - Tien hanh sue DO dir - Theo doi to,'pH, DO Phan tich ham hrong KLN rong ngheu b~ I - Them n6ng Zn hoac Hg xac djnh Kiern tra lai nong dO cac b~ bang may AAS Phan tich ham hrong KLN rong ngheu b~ Phan tich ham hrong KLN rong ngheu b~ Hinh 2: Sa a quy trinh thi nghiem tinh kh6ng thay nuac 3.2 Xdc dinh nJng a {j t{ li a o ngheu tich tt,l biio hila Hg va Zn K~t qua thi nghiern diroc t6m t~t tir mot chu6i cac thi nghiem Cac k~t qua duoc xu ly t6ng hop d~ ph an anh chu6i thi nghiern [5] 3.2.1 D i voi Hg Bang I Kit qua thi nghiem ham STT lu o n g Hg, Zn tich tu m6 ngheu [4] NAng dQ Hg thi nghiem Ham luong trung binh Hg ngheu sau 07 (n=3) NAng dQ Zn thi nghiem Ham luong trung binh Zn ngheu sau 07 (n=3) mg/l mglkg khf mg/l mg/kg khf Dqtl 0,15 8,32±0,71 1,03 240,32± 1,45 Dqt 0,28 12,80±0,65 2,11 291,80±2,35 Dot 0,51 13,45±0,37 3,09 309,04±1,35 Dqt4 0,53 13,47±O,74 3,19 310,O6±1,O6 Dqt5 0,56 C6 ngheu chet 3,20 C6 ngheu chet Dqt6 0,63 C6 ngheu chet 4,11 C6 ngheu chet Dqt7 11,21 Ngeu chet 50%/ 96h 20,20 Ngeu chet 50%/ 96h " Chi! thich: n=3 fa s6 lu o n g bi thi nghiem tai cae nong a (J khac Sau a o tinh kit qua trung binh tai m6i nong a (J Bang chi mire dQ tich tu bao hoa cua Hg va Zn mo ngheu, Tai nong dQ 0,53 194 H(Ji nghi Khoa h9C kj; niem yxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA 35 nam Vien Khoa h9C JIHGFEDCBA v a C6ng ngh¢ V ie : Nam - H a N(Ji 1012010 mg/l thi ham hrong Hg ngheu dat gia tri bao hoaRQPONMLKJIHGFEDCBA I I I 13,47 ±0,74 mg/kg kho Khi tang nong de>len 0,56 mg/l thi ngheu chet t5' 1~ 1-2 con/8con thi nghiem Nhu v~y tai nong de>nay ngheu da virot ngu5ng chiu dung va d~n d~n chet, Tai nong de>11,21 mg/l, t5' 1~ngao ch~t I I I 4/8 96h, day chinh I I I gia tri LC50 cua thuy ngan Tai nong de>3,11 mg/l ngheu tich 1\1 bao hoa Zn voi ham hrong 31 0,06± 1,06 mg/kg kho Khi tang len d~n 3,2 mg/l ngheu chet voi t5' 1~ 1-2 / 8con thi nghiem Khi thi nghiem voi nong de>20,2 mg/l, ngheu chet voi t5' 1~4/8 96h, day chinh I I I gia tri LC50 cua kern 3.3 Xdc din" ctic 3.3.1 H? s6 tich hf s6 tich tl! KLN ngheu tu tram tich BSAF K~t qua phan tich m~u KLN tram tich thu tai bai kho, C, cua Hg I I I 0,32 mg/kg kho Bang H? s6 tich III C, cua Zn III 167,10 mg/kg tu Zn, Hg trdm tich a6i voi ngheu [4] DQi thu c , "cua Zn BSAF cua Zn c , cua Hg BSAF cua Hg m§u (mg/kg khd) (kg tt/kg mo) (mg/kg khfi) (kg tt/kg md) Dqtl 231,28 1,38 0,37 1,16 Dqt2 232,42 1,39 1,00 3,13 Dqt 239,24 1,43 0,57 1,78 Dqt4 239,24 1,43 0,65 2,03 Dqt 211,28 1,26 0,65 2,03 Dqt6 222,42 1,33 0,45 1,41 Dqt 223,24 1,34 0,56 1,75 TB 228,45±9,36 1,37±O,O6 O,61±O,19 1,91±O,58 *KY hieu: tt - trdm tich Theo bang 2, cac gia tri tich t1,1tram tich cua Hg cao hon so voi Zn Gia tri trung binh cua BASF cua Hg I I I 1,91 kg tt/kg mo, cao hon 1,4 l~n so voi h~ s6 tich t1,1BSAF cua Zn I I I 1,37 kg tt/kg mo Gia tri BSAF tinh diroc cling phu hop voi k~t qua nhan dinh v~ bieu hien nhi~m cua Zn va Hg tram tich Ham hrong Hg tram tich tai bai ngheu virot ngu5ng tac de>ng ISQGthAp(0,15mg/kg kho), ngu5ng b~t d~u gay tac dong cho cac sinh v~t Ham hrong Zn tram tich tai bai ngheu so sanh voi GHCP nhan thay d~u thap hon ISQGth§p(200mg/kg kho) Qua phan tich ANOVA va kiem tra LSD ( a = 0,05) cho th~y S\I tich hiy Hg va Zn mo ngheu thirc t~ c6 khac Ham hrong Zn trung binh mo I I I 228,45±9,36 mg/kgkho; cua Hg I I I 0,61±0,19 mg/kg kho 3.3.2 H? s6 tich tu sinh h9C BeF Gia tri Cto I I I gia tri trung binh ham hrong KLN ngheu 07 dot thu m~u Gia tri phan anh mire de>tich t1,1KLN trung binh cua ngheu khu V\IC cira song Bach Dang Cto cua Zn 1£1:228,45 mg/kg kho va C tOcua Hg I l l : 0,61 mg/kg kho V oi C', cua Zn III 3,19 mg/l va C's cua Hg III 0,53 mg/l 195 ISBN: 978-604-913-015-1 riiu ban: Khoa h9C cong ngh~ Biin yxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA Bang RQPONMLKJIHGFEDCBA H? s6 tich tu sinh h9C cua Zn, Hg a6i voi ngheu [4] B~ C C BCF cua Zn (mg/kg khd) t BCF cua Hg cua Hg (mglkg khd) (Llkg mo) (L/kg md) B~ 309,87 25,52 12,84 23,08 B~ 311,21 25,94 14,29 25,81 B~ 309,11 25,29 13,27 23,89 310,06 ±2,64 25,58±0,82 TB [;;~ ~ ~ ciia Zn t :J ~ :~ ~ g :M ~ :~ _ = ;:~ ; ,~ ; ,L_ :.:;: , - - - r " " " ': = - 12 24,26±3,84 13,47±1,85 ~;~;J:J~J~m~~~~~L:::·::·::=_:=:::_· - , -. = ~ "11 250 H I' 200 ii 150 II 100 !i 50 iI Ii 10 iI 1) 0.15 l=senes1 Hinh un 0.51 0.28 -P o ~ l=SerieS1 (Senes1)l Bidu a6 xac dinh nong a(J Hg ngheu tich tu biio hoa 2.11 Hinh 109 - P o ly (senes1)l 3.19 ! NongdQ ~ !I Bidu a6 xac dinh nong a(J Zn ngheu tich tu bdo hoa H~ s6 tich tu sinh hoc trung binh (BCF) cua Zn la 25,58 L/kg mo va cua Hg la 24,26 Llkg mo Qua phan tich ANOVA va kiem tra LSD ( a = 0,05) cho thay S\1' tich h1y Hg va Zn me ngheu theo thi nghiem co khac 3.4 Tltiio lu{jn a vung cira song Bach - Da xac dinh duoc ham hrong Hg trung binh mo ngheuJIHGFEDCBA D~ng la 0,61±0,19 mg/kg mo; cua Zn la 228,45±9,36 mg/kg mo Nhu vay ham hrong Hg ngheu vung cira song Bach Dang cao hon mo ngao d~u (Meretrix meretrix) khu vue cira D