Tgp chi Khoa hgc va Cdng ngh$ Biin; Tap 14, S6 1; 2014 68 74 ISSN 1859 3097 http //www vjs ae vn/index php/jmst DANH GIA HIEN TRANG CHAT O NHIEM POLYCHLORINATED BIPHENYL (PCBs) TRONG MOI TRLTONG VA MO[.]
Tgp chi Khoa hgc va Cdng ngh$ Biin; Tap 14, S6 1; 2014: 68-74 ISSN: 1859-3097 http://www.vjs.ae.vn/index.php/jmst DANH GIA HIEN TRANG CHAT O NHIEM POLYCHLORINATED BIPHENYL (PCBs) TRONG MOI TRLTONG VA MO SINH VAT VEN B C DONG B A C V A CHAU THO S O N G HONG Duong Thanh Nghi*, Tran Biic Thanh Vi?n Tai nguyen va Mdi trudng bien-Vi?n Han lam Khoa hgc va Cdng nghe Vi?t Nam 'E-mail: nghidt@imer.ac.vn Ngay nhan bai: 13-3-2014 TOM TAT: Trong dgt khdo sdt mua khd, thdng vd miia mua, thdng ndm 2012, ddphdn tich ddng phdn diin hinh cita chdt d nhiim PCS gdm: PCB 28 PCB 52, PCB 101, PCS 138 PCB 153 PCB 180 cdc mdu nu&c, trdm tieh vd md thit ngao trdng (Meretra lyrata) dugc thu tgi viing biin ven b& Ddng bdc Viet Nam vd chdu thd sdng Hdng Kit qud eho thdy PCBs xudt hiin ba hgp phdn mdi tru&ng a cd miia khd vd miia mua v&i hdm lugng tuang ung Id 719,46 - 792,11 ng/L; 9,83 - 14,97 ng/g khd; 39,79 - 40,30 ng/g khd, ndm gi&i hgn cho phep ciia Quy chudn mdi tru&ng Hdm lugng PCBs vimg ven b& Ddng Bdc cd tuang quan nghich giUa moi tru&ng vd mo thit ngao, cdn viing ven b& Chdu thd sdng Hdng cd su ddo chiiu mdi tru&ng nu&c so v&i vimg tren ddn den cd mdi tuang quan thugn v&i md thjl ngao Hi sd tich tu sinh hgc (BAF) ciia ngao v&i PCBs tit 7.46 den 56,42 vd viing ven b& chdu thd sdng Hong cao han ven b& Ddng Bdc Viit Nam cd hai miia Tir khda: POPs PCBs, bio-accumulation, biin ven ba, Ddng Bdc Viit Nam Viet Nam tham gia eong ude Stockholm 22 thang nam 2002, da ed cae nghien ctiu vl quan ly su dung va cam kit dan logi bo cac chit nhilm hiru eo bin (POPs) khoi mdi tnrdng dgc tinh gay ung thu va dgt biin gen eiia ehung Vi?t Nam khdng san xudt PCBs nhung SIX d\ing nhiing thilt bj eong nghiep va thiet bi nganh dien nhap khdu Hien nay, lugng chdt PCBs d Vi?t Nam la rdt Idn, theo mgt so cuoc dieu tra thi co the len tdi 20.000 tan Theo do, T6ng Cong ty dl?n Viet Nam la to chiic dang quan ly cac thilt bi dien (san xudt va fruyin tai) nhieu nhdt Thdng ke ban dau cho thdy, to chuc hi^n dang quan ly fren 60% ting lugng PCB tgi Vi?t Nam Cy the, khoang 9.000 tdn ddu PCB, va khoang 1.000 tdn ddu nghi ngd ed PCB cae h? thing dien Ngoai ra, edn t6n tgi mgt lugng PCB frong cac thiet bi cdng nghiep nam ngoai nganh di?n hien chua duoc xae dinh chfnh xac [7] Bien ven bd la noi tiep nhgn cudi eung cac ehat nhiem, dd cd PCBs tti cac lim vyc song theo ddng nude dd vao biin va phan bo lai cac hgp phan nude, fram tich va sinh vat Cac ket qua nghien ctiu eua bai bao ve nhiem PCBs moi trudng hiln ven bd va kha nang tfeh ty nhilm PCBs frong md thit ngao thdng qua h? sd tich ty sinh hgc (BAF) gdp phan guan ly, ngan ngtia tac hai cua POPs/PCBs den sue khde h? sinh thai va ngudi TAI LIEU VA PinrOfNG PHAP NGHIEN Ctru Khu vuc nghien ciru va tr^m vi thu mau Mau ciia ba hgp phan mdi trudng dugc thu ddng thdi vao hai dgt: thang (miia khd) va Danh gia hien trgng chdt nhilm polychlorinated thang (miia mua) nam 2012 hai viing ven bd bien khu vuc phia Bde Viet Nam tti Mong cai den Ninh Binh la; ven bd Dong Bdc va Chau th6 song Hdng (hinh 1) dinh mtic din mL bdng n-hexan [5], Mdu thjt ngao: Chllt sieii am 20 g mdu thit ngao ding nhdt, lam khd bdng Na2S04 khan, ba lan bdng hon hgp dung moi n-hexan/axeton (1:1, v/v); ly tam mau ehiet de taeh loai dung moi khoi mdu thit ngao Cd quay dieh chiet ve khoang mL; dung cot sac ky thdm than gel dl logi bo eae chat beo, amin eo tiong mau ehilt, noi tilp vdi cgt sac ky ehua g silieagel dl nia giai bdng 3x15 mL n-hexan; co quay vl 0,5 mL, them chat ngi ehuan, dinh mue den mL bang nhexan [6, 7] Phdn tich mdu Hinh So vi trf thu mau Phinmg phap thu va bao quan mau Mau nude duge lay d dg sau 0,5 - 0,7 m bdng thilt bj Bathomet va duge ehjia chal thiiy tinh mau toi Mau fram tich lay d dg sau - cm bang euoe Ponar iam bang thep khong ri, ed dae diem min, phdn biin set eao, duge bao quan Ig thuy tinh mdu tii Mdu ngao (Meretrix lyrata) lay bdng eao va ludi day, ed dac diem kfch thudc dai, rgng va be day trung binh tuong ting la 2,6 - 5,8 em; 1,0 - 5,1 cm va 0,6 - 3,3 cm, duge bgc gidy nhom da lam sach Tat ea cac mau dugc bao quan dilu kien nhiet - 4^0 [2, 5, 6] Phuong phap xu ly va pfaSn tich mau Tach chiet PCBs khoi mdu nghiSn ciru Mdu nu&c: I lit mau dugc chiet ba lan vdi n-hexan, e6 quay ehan khong ve the tfch khoang mL, djch mau cd quay dugc eho gua cdt sac ky chua g silieagel, rua giai bdng 45 mL n-hexan; ed quay dung dich rua giai khoang 0,5 mL; them chat ngi ehuan va dinh mue den mL bdng n-hex^n [3,4] Mdu trdm tich: Chiet siSu am 20 g mau kho ba ldn bdng hdn hgp dung mdi n-hexan/axeton (1:1, v/v); ly tam, cd quay chan khdng dich ehilt din khoang mL; tach chdt fren cgt sdc ky chua g silieagel bdng 3^15 mL n-hexan; cd quay dich rua giai ve 0,5 mL; them chat ngi chudn va Thiet bi sac ky detecto edng kit di?n tii cua hang Agilent 6890, My (GC-ECD) dugc su dyng de dinh tfnh va dinh lugng PCBs Dilu kien vgn hanh thilt bj GC-ECD dl phan tich xae dinh PCBs da dugc xae lap Chuong trinh nhiet dp cgt: SO^C, phiit, 20°C/phut, 250''C, 5''C/phut, 290°C, phut T6ng thdi gian phan tich la 22,5 phut; toe dong mang N2 la 0,9 mL/s vdi ty le chia ddng 1:28; cgt sdc ky mao quan HPI (30 m x 0,32 mm x 0,25 mm) Theo bao eao khoa hgc eua Tram quan tiac bien ven bd mien Bae 2011, Vien Tai nguyen Moi trudng bien va thye nghiem eua tae gia: Pha cac hon hgp dung dich chuan PCBs tuong ung nong 15 ng/mL, 30 ng/mL, 60 ng/mL, 90 ng/mL Phan tich cac hon hgp chuan tren bang GC-ECD 6890 vdi dieu kien da neu d tien Xif ly ket qud Tinh ham lugng PCBs tiong eae hgp phan bdng phuong trinh dinh lugng PCBs c6 he s6 tuong quan (R^) > 0,99 Nong t6ng PCBs dugc tinh = A x J^PCB (PCB28 + PCB52 + PCBlOl + PCB138 + PCB153 + PCB180); do, A ed gia trj tir - 8,5, la he s6 tuong ting eua moi logi hon hgp Aroclor [4, 8] Tinh he so tfeh tu sinh hge (BAF Bioaecumulation Factor) ciia PCBs theo cac nghien curu da edng b6 [6, 8,10] Theo do: BAF = (BA)/(ECf), BA: Ham lugng tdng PCBs ton tgi md sinh vgt (ng/kg tuoi) ECf: Ham Iugng PCBs tiong nudc noi sinh vgt song (ng/1) Duong Thanh N ^ , Tran Diic Thanh KET QUA VA THAO LUAN Tinh chat moi tnrdng nen hai khu vuc Trong hai dot idy mau deu khong g|p mua hay gidng bao Nhiet dg khong dao ddng miia khd tii 16,10°C den 22,70''C va tiong miia mua tir 25,70°C din 32,70''C va cd xu hudng tang tu vung tiieu ven bd bien Mong Cai den Ninh Binh Tfnh chdt hda ly eua mdi trudng nudc bien tai vi tii idy mlu xac dinh hai dgt dugc frinh bay d bang Trong vung cd nhi$t dO va dg muoi dao dOng frong khoang 17,25 din 33,23''C; va 10,00 din 31,50%o Vung eo nhi?t dd va dg mudi dao dgng khoang 19^05 den 30,45°C; va 10,00 din 30,45%o giam thap hon vung tac dgng ciia khoi nudc song ldn Do tfnh chat mdi trudng eiia vung va viing khac ddn din sy phSn bo chat nhiem PCBs khac Bang Dgc diem moi trudng d vi trf lay mau tiong vimg va vimg TT VOng Tr6C6 DSn TiSn Tidn Y6n Ven btt Dflng Bac {Vung 1) Tdn t r ^ m VCing Chau th6 sOng M6ng (Vang 2) BSi Ch6y H9 Long CAtBd Viae Kinh SO ("C) (%o) 0B1 E1B2 2l''25'50" 19''58'37" 108°01'58" 106''08'48" 18,21-28,13 20,50 - 25,50 18,20 - 28,00 10,50-25,50 E)B3 DB4 20''14'08" 106''34'19" 20''57-00" 20°35'36" 10/03'30" 106''37'10" 17,80-28,15 18,01 - , 10,00-30,00 25,30 - 30,00 DB5 DB6 D d mu6i 17,25 - 30,60 11,00-31,50 106'50"742" 18,25-32,31 25,00-31,00 20''49'10" 106''50'742" 106''45'40" 19.01-33,23 17,40-31.40 10,00-25,00 10,00-15,50 20''43'00" 106''50'00" 18,22-32.53 20,00 - 30.50 SHI SH2 20a ThAiBlnh Cira Ba L^t CiJaOdy rpaflfl Ky hi$u 20''47'l26" 20°47'126" Ham lugng PCBs man nghien euu Ham lugng PCBs viing I: PCBs xudt hien frong ca mua mua va mua kho Trong mdi tiirdng nude, ham lugng tong PCBs dao dgng tu 644,76 ng/L den 939,46 ng/L va mua kho cao hon mua mua khoang 1,46 ldn Ham lugng tong PCBs tiong tidm tieh dao dgng tir 8,01 ng/g kho den 11,64 ng/g kho va ndm gidi hgn cho phep QCVN43: 2012/BTNMT [1] Ham lugng ting PCBs frong md thit ngao dao ddng tu 23,71 ng/g khd din 55,86 ng/g khd, nam gidi hgn eho phep cua Cyc hda chdt va dugc phdm Hoa Ky (FDA US, vdl hai san < ppm) [9] Ham lugmg PCBs vimg 2: PCBs xudt hien frong ca miia mua va mua khd Trong mdi trudng nudc, ham lugng tdng eae PCBs dao d6ng tir 133,75 ng/L den 1305,18 ng/L, miia mua eao hon mua khd khoang 9,75 I n Ham lugng tong PCBs frong frdm tich dao dgng tti 3,39 ng/g kho din 26,55 ng/g khd va ndm gidi hgn eho phep QCVN 43:2012/BTNMT [1] Ham Iugng tdng eae PCBs m6 thjt ngao dao dgng tu 31,60 ng/g kho din 49,01 ng/g khd, nam gidi hgn cho phep cua Hoa Ky[9] Ham lugng PCBs c^c hQp ph^n moi trudng Cac ehat PCBs ludn xudt hien frong moi trudng nude biin va biin dgng theo miia va tiieo khu vyc, chting td viing nghien ctiu co tilp nhSn ngudn phat thai PCBs Mgt s6 hda chdt c6ng nghiep cd chua PCBs bi edm sti dyng d cdc nudc phat friln tti nhiing nam 70, nhung d Vl?t Nam van dang su dyng va tung budc khoanh vung xd ly nganh di?n, nen nguon d nhilm PCBs bl sung vao mdi trudng nudc vdn ton tgi Theo miia, nude vung cd ham lugng tong PCBs frong miia khd cao hon frong miia mua, vung thi ngugc Igi Ham lugng tdng PCBs frung binh nSm frong nudc vung cao hon viing khoang 1,10 ldn (bang 2) Danh gia hien trgng chdt nhilm polychlorinated Bang Bien dgng ham lugng PCBs tiong nudc vung va viing Vdng Miia Dcrnvj PCB 2d PCS 52 PCB 101 PCB 153 PCB 138 PCB 180 16 PCS Tfing PCBs Kha ngfl ng/L ng/L ng/L ng/L ng/L 11,14 31,59 21,37 8,71 26,72 17,71 127,22 59,17 93,20 10,87 123,45 67.16 0,74 6,24 3,49 6,52 9,39 7,95 0,49 2,54 1.51 1,76 8,32 5,04 0,27 20,BB 10,57 0,12 32,05 16,08 1,26 2,94 2,10 0.84 2,07 1,45 133,88 99,74 116.81 19,87 194.45 107.15 939,46 644,76 792,11 133,75 1305,18 719.46 Viing Mira VCing Khfl Mtra TB2 Khac vdl mdi trudng nudc, sy phan bl va tieh ty PCBs tiong tram tich phu thugc vao dgng hge qua trinh idng dgng ciia cae ehdt lo Idng va khueeh tan cua cac dgng hoa tan, d tirng viing Tram tieh vung ed ham Iugng PCBs frong miia khd cao hon mua mua tuong ling vdi mdi trudng nudc Trdm tfch vung cd ham lugng PCBs cdn phu thugc vao cac yiu t l ddng ehay ven bd, dia hinh day va thdi gian lang dgng tram tich d eua song, nen nong dp PCBs frong mua khd eao hon mua mua Viing CO ham lugng ting PCBs trung binh nam tram tfch eao hon viing khoang 1,52 ldn (bang 3) Bang Bien dgng ham lugng PCBs tram tich viing va viing VOng VCing VCing MOa Khfl M^ra TB.1 Khfl Mira TB.2 e„„v| ng/g ng/g ng/g ng/g ng/g ng/g khfl khfl khfl khfl khfl khfl PCS 20 P(X52 PCB 101 PCB 153 PCB«8 P(S180 T6PCB 0,40 0,12 0,26 0,53 0.06 0.29 1,08 0,69 0,89 3,12 0,34 1,73 0,08 0,51 0,30 0,07 0,04 0,05 0,19 0,04 0,11 0,16 0,04 0,10 0,08 0,03 0,06 0,11 0,03 0,07 0,16 0,04 0,10 0,15 0,03 0.09 1,76 1,30 1,53 3,80 0,49 2,14 Ngao (Meretrix lyrata) la mgt loai hai manh vd song day mdi trucmg cat pha biin, cd dgc diem an Igc va it di ehuyen Ham lugng PCBs tiong md thjt cua ngao bien ddi ed tfnh chdt mua vu tuong ting vdi mdi trudng nude va moi trudng tiam tieh Tuy nhien, tfnh chat tfeh ty sinh hgc nen ham Iugng chat Tflng PCBs 11,64 8.01 9,83 26,55 3,39 14,97 nhieni thit ngao khdng ehi phu thugc vao yeu to mdi trudng ma edn dugc quyet djnh bdi dgc diem sinh hgc cua sinh vgt Xu hudng phan bo tich tu PCBs tiong md thit ngao miia kho thdp han mua mua d ca vimg va viing 2, ed the chi thi cho ngudn d nhiem PCBs van dang dien tiong moi trudng nude (bang 4) Bang Biin ddng ham lugng PCBs thit ngao vung va vung Vilng VCing VCing Mua Dornvi PCB 28 PCS 52 PCS 101 pce«3 PCB 138 PCS 180 16 PCS T6ng PCBs Khfl Mtra TB.I Khfl Mira TB2 ng/g khfl ng/g khfl ng/g khfl ng/g khfl ng/g khfl ng/g khfl 0,79 0,37 0,56 0,62 0,06 0,34 2,02 6,36 4,19 3,52 6,76 5,14 0,26 1,17 0,71 0.12 0,06 0,09 0,62 0,21 0,42 0,30 0,11 0,21 0,24 0,25 0,24 0,17 0,03 0,11 0,99 0,59 0,79 0,19 0,04 0,11 4,18 8,42 6,30 4,52 7,00 5,76 23,71 55,86 39,79 31,60 49,01 40,30 T^ 1$ phan bo PCBs frong vung ven bd A—™ Bdc Doii cho i-kn thay t h a v Vli hirrrno bien Kisn rtAnn Ddng xu hudng dOng Kom ham lugng PCBs tiong mdi trudng ty nhien va sinh vgt khdng tuong quan thuan Dgc dilm phan bo tiing hgp phan ed khac bi?t ldn d nudc va smh vgt, frong tram tich gdn nhu xdp xi giua hai miia Dieu eho thdy sy on dinh eua Df^Re mAi tnrrvtm cir PCBs fmnn tiong moi trudng trSm tram tifli tieh i/Tino vung 11 va va sy thay ddi PCBs tiong mo thit ngao hi anh hudng bdi mdi trudng ty nhien thap (hinh 2) Trong vung ven bd ehau thd sdng Hdng, xu hudng bien ddng ham lugng PCBs frong mdi Duong Thanh Nghi, Tran Dtic Thgnh trudng ty nhien ngugc Igi vdl viing ven bd Dong Bdc, nhung PCBs md thit ngao thi vdn eao mua mua Ham lugng PCBs md thjt ngao tuong quan thuan theo PCBs nudc viing (hinh 2) Hinh Xu hudng biin dong ham lugng PCBs mdi trudng va md thit ngao H | so tich tu sinh h^c cua PCBs mo ngao Mge du nong dg PCBs moi trudng thay dii theo nhieu dilu kien nhu ddng chay, dja hinh, qua tiinh idng dgng, qua trmh riia troi, qua frinh tich ty ciia mdi trudng vo sinh, nhung BAF vdi PCBs eua ngao dugc quyet dinh bdi ty 1# nlng dg giii md thit sinh vat vdi moi trudng nude xung quanh Do do, viing ven bd chau thi sdng Hong co gia fr| BAF vdi PCBs cao hon vung ven bd Dong Bac eho thdy tich luy sinh hge PCBs vung ciia sdng eao hon vting vinh dao BAF trung binh nam eua ngao vdi PCBs tti 7,46 din 56,42 (hinh 3) Hinh He so tieh ty sinh hgc BAF eiia ngao vdi PCBs d vung va viing Nhu vgy, chat nhiem PCBs duge vgn ehuyin den mdi trudng bien bdi khdi nude vdi ham lugng thap nhung duge phan bd tich luy lai vao hai hgp phan moi trudng la fram tich va md thjt ngao vdl ham lugng cao hon nhieu ldn Kit qua chi kha nang tieh ty chdt d nhigm PCBs moi trudng tram tfch va mo thit ngao He sd BAF vdi PCBs cua ngao eho thdy ddu hieu phoi nhiem PCBs tir hgp phan vo slnh vao hgp phan hiiu sinh va se gay hgi eho he sinh thai co ngudi qua chuoi thiic an Dieu dinh hudng cho cac nha nghien euu, cac nha quan ly vl?c ngan ngtia sy phat thai PCBs ciing nhu POPs vao mdi trudng khu vuc KET LUAN Chdt d nhiem htiu co ben nhom PCBs c6 mat ddrig thdi ba hgp phan mdi trudng nirde, trdm tich va sinh vgt d viing ven bd Dong Bdc va chau thd sdng Hdng Ham lugng tong PCBs ba hgp phan tren tuong ting la 719,46 792,11 ng/L nude; 9,83 14,97 ng/g khd tram tich; va 39,79 40,30 ng/g kho md thit ngao Mgc dii ba hgp phan nude, tram tieh va slnh vgt nghien euu deu xudt hi^n PCBs nhung ndng dg viia chiing eae mau diu ndm gidi hgn cho phep Phan bo va tich ti^ PCBs co tinh ehdt theo mua, nhung cd sy khac tiing hgp phan mdi trudng va khu v\rc nghiSn etiu Sy phan bo va tich ty PCBs hgp phan vd sinh (nudc va trdm tfch) phy thugc vao nguin nudc nhilm, nhung hgp phan htiu sinh (mo thit ngao) phy thuOc vao kha nang tfch liiy va tfnh bin cua PCBs H? so tfeh ty sinh hgc (BAF) vdi ting PCBs cua ngao dao ddng tii 7,46 din 56,42; tiong dd viing eiia sdng ven bd Danh gia hien trang chdt nhilm polychlorinated chau thd song Hdng cao hon vung vinh dao ven bd D6ng Bac Vi^t Nam Ldi cam on: Cdng trinh dugc hoan dudi sy ho trg kinh phi eua dl tai CTGOl/12-13 Cae tae gia xin tran trgng cam on; xin cam an Trgm quan tiae mdi tnrdng hiln ven 1, cac sd va ban nganh d dia jihuong da giiip chiing toi qua timh tiien khai thyc hi?n dl tai TAI LIEU THAM KHAO Bg Tdi nguyen vd Moi tru&ng, 2012 QCVN lp:2008/BTNMT vl Chat lugng nudc biin ven bd, 2008 va QCVN 43:2012/BTNMT ve ehdt lugng tram tich Canada Environment Agency, 2003 Canadian Environmental Quality Guidelines Summary of Existing Canadian Environmental Quality Guidelines DS Quang Huy Duang Thanh Nghi, 2001 Xae dinh du lugng hoa chat bao ve thyc vgt mau moi trudng bdng phuang phap sdc ky Tgp ehi Moi trudng, Dai hgc Khoa hge Tu nhien, DHQGHN Tap Tr 20-25 Duong Thanh Nghi, Trdn Dire Thanh, Trdn Vdn Quy, Do Quang Huy 2011 Danh gia kha nang tfeh tu sinh hge PCBs va PAHs vimg Hg Long, Tuyen tap bao eao Hgi nghj Khoa hgc va Cdng nghe bien Toan qude lan thii V, Nxb Khoa hge Tu nhien va Cdng nghe Tr 77-84 Duong Thanh Nghi, Dd Thi Viet Huang, Nguyen Hoang Todn Dd Quang Huy, 2012 Tich ty Polielobiphenyl d cae viing ctia song ven bien thuge dja phan Hai Phdng, Tgp ehi Khoa hoc Tu nhien va Cong nghe Tap 28, Sd 4S, 153-160 Duang Thanh Nghi Trdn Due Thanh Trdn Vdn^ Quy 2013 Phan bd va tfch ty chdt d nhilm huu co bin OCPs VA PCBs tiong vung biin ven bd phfa Bde Vi?t Nam, Tgp chi Khoa hge va Cong nghe biin Tap 13, S6 l.Tr 66-73 Pham Binh Quyen Dang Due Nhan, Nguyen Van San 1995 Environmental pollution in Vietnam: analytical estimation and Envuonmental priorities Trends in analystical chemistry, Vol 14, No 8, pp 383-388 Elsevier Science B V All right reversed US EPA 1995 Great Lakes Water Quality Initiative technical support document for the procedure to determine bioaecumulation factors EPA-820-8-005, NTISPB95187290 185 pp US FDA, 2008 Environmental Chemical Contaminant and Pesticide Tolerances, Action Levels, and Guidance Levels, 21 pp 10 www.vietbao.vn/Kinh-te/VN-Thuy-SyThoa-thuan-thai-loai-chat-doe-hai-PCBnganh-dien/20659075/174/ Duong Thanh Nghj, Trdn E>uc Thanh ASSESSMENT OF THE POLLUTANTS OF POLYCHLORINATED BIPHENYL (PCBs) IN THE COASTAL ENVIRONMENT OF NORTHEAST AREA AND RED RIVER DELTA, VIETNAM Duong Thanh Nghi, Tran Due Thanh Insthute of Marine Environment and Resources-VAST ABSTRACT: The persistence organic pollutants of PCB group (28, 52 101, 138, 153, 180} were determined in three coastal environment components including water, sediments and tisstxs o Clam (Meretrix lyrata) in the Northeast area and Red River delta The samples were collected in March and August 2012 The results showed that the PCBs were appearing in all water, sedimen and tissues ofClam with the concentrations 719.46- 792.11 ng/L; 9.83 - 14.97 ng/g; 39.79-40.30 ng/g respectively, and lower than environmental standards The distribution of total PCBs in the three environmental components were varied by the seasons and space They were an inversive relationship of PCBs in the coastal water- sediment environment and tissues of Clam in Northeast area, meanwhile ambient relationship in Red River delta The bioaecumulation factor (BAF) of the total PCBs for Clam tissue was in the range from 7.46 to 56 42 higher in Red River delta, and lower in Northeast area in both rainy and dry seasons Keywords: POPs, PCBs, bio-accumulation, coastal area Northeast Vietnam ...Danh gia hien trgng chdt nhilm polychlorinated thang (miia mua) nam 2012 hai viing ven bd bien khu vuc phia Bde Viet Nam tti Mong cai den Ninh Binh la; ven bd Dong Bdc va Chau th6 song Hdng... tfeh ty sinh hgc nen ham Iugng chat Tflng PCBs 11,64 8.01 9,83 26,55 3,39 14,97 nhieni thit ngao khdng ehi phu thugc vao yeu to mdi trudng ma edn dugc quyet djnh bdi dgc diem sinh hgc cua sinh vgt... nhien thap (hinh 2) Trong vung ven bd ehau thd sdng Hdng, xu hudng bien ddng ham lugng PCBs frong mdi Duong Thanh Nghi, Tran Dtic Thgnh trudng ty nhien ngugc Igi vdl viing ven bd Dong Bdc, nhung