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p chi Khoa hoc Tnnmg Dgi hoc Can Tha Phdn A Khoa hoc Tu nbien Cdng nghe vd Mdi mr&ng 28 0.05) qua phep thir Duncan Gii trj ham lugng Zn tfing sfi dao dfing 60,06± 13.06 mg/kg din 105,24±12.68 mg/kg Him lugng Zn tdng sfi thdp hon nhlu so vdi ham lugng qui dinh frong qui chuan Viet Nam 2008 la 200 mg/kg Theo Ngd Ngoc Himg, 2005 trich dan tir Dierolf vd cir nim 2001 thi ddt thieu Zn cd ham lugng Tap chi Khoa hoc Tru&ng Dgi hgc Cdn Tho PhdnA Khoa hoc Tu nbien Cong ngh? \d Moi trudng: 28 (2013): 73-79 tfing sd < 20 mg/kg Theo gioi hgn ham luong tdng sd ciia mdt sfi kim logi ning ttong cac nhdm ddt ndng ngfailp ddi voi tdng mat ciia Vien Tfad nfauong Ndng hda da xiy dung thi ham luong Zn tdng sd ttong dat phii sa d miic trung binh tfadp 45.0 mg/kg - 76.6 mg/kg, trung binfa cao 76,6 mg/kg - 21.65 mg/kg (Ll Tfai Tfauy vi Pham Quang Hi, 2008) Vay d cic kfau vyc nghien ciiu xet d hai dp sdu vd hai vy tfai hdm lugng Zn tfing sfi cao hem ngudng thilu nhieu Ian, nhung da sfi cac Bang 4: Kit qud ham lugng Zn hoa tan dat Kien An PhiiMJ Tan Hoa Tan Trung mdu cfi hdm lupng ehi d miic trung binfa cao nen nguy CO vi d nhiem Zn chua xdy 3.5 Ham lugng Zn boa tan Zn hda tan khfing khac bill gii^a hai ting, md CO kfadc biet giiia hai miia Thu Dong vi Ddng Xuin Tai Tan Trung cd ham lugng Zn hda tan cao hon ba khu vuc cdn lgi Gii tri Zn hda tan dugc ghi nhdn tai Bdng (mg/kg) tai cac kfau vyc khao sdt Dong Xuan Thu Dong cm - 20 cm 20 cm - 40 cm 20 cm - 40 cm cm - 20 cm 7,61'±0,79 8,65" ±1,19 11,29"'±0,47 8,74" ±1,44 7,45'±0,94 8,41'±1,20 10,40' ± 2,03 9,90'±1,69 10,40'±1,50 9,81'±0,80 7,62'±1,85 7,07'±1,01 13,23'±1,45 12,43'±0,82 11,63" ±2,45 10,64'±2,31 Ghi chu- Cdc gid tri cung mot cot co cimg ki tu (a, b c, d) thi khong co khdc biet cd y nghia ihdng ke (p>0.05) qua phep thu Duncan Nfaieu kit qui ngfailn ciiu dd ket lugn dat thilu kem kfai ham lucmg kem hiiu hieu < 0,6 ppm (Chu Thi Thom va ctv., 2006) Voi him lugng Zn hiiu hieu nhu frln cd thi ddnh gid ddt tai cac khu vyc nghiin cim kfadng tfaieu kem Ben canfa dd, theo nghien cim cua Duong Minh Vien vd ctv (2010) d dit cd nfain vd kfadng cd nfaan phii sa ttong bdn ndm thi sy suy gidm ban diu ciia K frao dfii ciing nhu vi lugng Zn hda tan ddt ciing la tin hieu cho thdy nhinig bdt loi cd thi mang lgi cho dl bao Bang 5: Ket qua ham lugng Cd tdng si dat Khu virc Kien An Phii My Tan Hoa Tan Trung ngan lu Do ham lugng kem hfia tan cao nhat d khu vyc khdng de bao xa Tdn Trang sau vy lu dat nhdn dugc phii sa lam tdng lugng kem hiiy hi|u frong dat 3.6 Ham lugng Cd tdng sfi Ham lugng Cd tfing sfi tai khu vyc dl bao ttilt de xa Kiln An cao nfadt, kl tiep la khu vyc kfafing dl xa Tdn Trang vd tfadp nhat li khu vyc bao de vita xd to xa Tan Hda (mg/kg) tgi cac khu vyc kfaao sat Thu Dong cm - 20 cm 20 cm - 40 cm 0,50" ±0,06 0,63" ±0.08 0,34'«±0,06 0,40 "±0,02 0,29' ± 0,03 0,35' ± 0,05 0,39' ± 0,04 0,48' ± 0,07 Dong Xuan cm - 20 cm 20 cm - 40 cm 0,51'±0,02 0,48" ±0,02 0,51'±0,01 0,50'' ± 0,02 0,50'±0,01 0,47'' ± 0,02 0,49" ±0,02 0,46'±0,01 Ghi chii Cdc gid In citng mot col cd citng ki lu (a b c d) thi khdng co khdc biet cd y nghta thong 1^ (p>0.05) qua phep thu Duncan Theo gidi hgn faim lugng tdng sd ciia mdt sfi kim logi ndng cdc nfadm dit nong ngfailp dfii vdi tdng mat ciia Vien Tfafi nfauong Nfing hfia xiy dyng thi him lugng Cd tdng sfi ttong ddt phii sa d miic thip < 0.5 mg/kg, frung binh thap 0.5 mg/kg mg/kg (Ll Thj Thiiy vd Pham Quang Ha 2008) thi ham lugng Cd khu vyc nghiin ciiu chi d miirc trang binh thip Ben canfa dd him tugng Cd tfing sfi phit hiln dugc thip ban nfaiiu lin so voi qui chudn Viet Nam nam 2008 li mg/kg Ham lugng Cd tai kfau vyc nghien ciiu dao dfing lir 0.29 mg/kg - 0.63 mg/kg chua vugt qua 1,1 mg/kg Ham lugng Cd van chua vugt nguong thi hiln dnh hudng ciia ngudi Tuy hdm lupng Cd d khu vyc vdn chua d nhiem nhung ciing cin luu y vi ngodi ham lugng Cd tdng sd phat hiln ham lugng Cd hda tan hiu hit cic mlu phin tich 3.7 Ham lupng Cd hda tan Ham lupng Cd hoa tan trung binh vu Thu Dong CO gii fri tir 0,020 mg/kg - 0,036 mg/kg Chi co sy khic biet gitra hai dp sau tai khu vyc bao dl vira xd lu xa Tan Hda Kit qua Cd hda lan dupe the hien frong Bdng T(.ip chi Kboa hoc Tru&ng Dai hgc Cdn Tha Phdn A Khoa bpc Tu nhien Cong ngbe vd -Moi Inr&ng- 28 (2013/ 73-79 Bing 6; Kit qua faim lugng Cd hoa tan dat (mg/kg) tgi eac khu vyc khao sdt Kien An PhiiMJ Tan Hoa Tan Trung Thu Dong 20 cm - 40 cm cm - 20 cm 0,02'±0,00 0,02'±0,00 0,04" ±0,01 0,04'±0,01 0,02'±0,01 0,03" ±0,01 0,03'±0,00 0,03''±0,01 Dong Xuan 0cm-20cm 20 cm - 40 cm 0.11" ±0,01 0,11'±0,01 0,06' ± 0,02 0,09'±0,01 0,13" ±0,01 0,13'±0,00 0,12" ±0,02 0,04' ± 0,01 Ghi chir Cdc gid iri cimg mgt egt eg ciing ki lu (a, b, c d) thi khong co khac biet ca y nghTa thdng ki (p>0.05) qua phep thir Duncan Ty 1| phdn fram frTing binh cua Cd hda lan so vdi Cd tdng sd tai cdc khu vyc vao vu Thu Dfing dao dpng tir 3,17% din 11,19% Trong dd, Phii My cd ti 11 cao nhit Vdo vy Dfing Xuan ti 11 tang tin, dao dpng ttong kfaoang tir 7.83% din 25,20% Trong dd, cao nhit la khu vyc Tin Hda Theo Hd Thi Lam Tra, 2005 cac dang liln kit cda Cd khdng phy thupc vio ham lugng tdng sd cua Cd ddt Tai cac khu vyc nghien ciiu hini lugng Cd hoa tan dugc sovoi Cd long so co t 1? kha cao nen can luu y kha nang gay dpe cua Cd doi voi smh vgt Nhin chung, hdm lugng Cd hda tan cd xu huong vy sau cao faon vy frudc sir dung phan lin (trong phan hdn hop) NPK mfit thoi gian dai Ham lugng ting dudi cao hon ting trin cd thi dat fring lua dieu kien ngdp nudc din din trgng thdi ciia hgp chat CdS ddt liia yIm khi, dang sulfite bi oxi hoa frd nen acid hoa tir gdp phan lam linh dfing Cd (Ngd Ngpc Hung, 2012) Dieu ndy da ldm Cd hfia tan dting duoi cao hon ting tren Ddi vdi khu vyc khdng bao dl xa Tdn Trung li dit frfing mau cd hira lupng Cd hda ^^n tdng fren cao hon tdng dudi Theo Ngo Ngpc (2012) trich dan tii Geniste yd Driel (1984) *hi ham lugng chit hiru co dit thip dua den khd "^ng hap phy rat it kim logi ndng frong ddt, ddt trfing mau chiia it phdn chit huu co se ldm tang tinh sdn sang sinh hpc ciia Cd 3.8 Ham Imnig As ^ s chi duoc ting m^t (0 cm - 20 cm), chi ^it hiln As tdng sd, khfing phit hien As hda tan QJ^ t^ g^j ^han tai Bing Vy Thu Ddng tchu vyc bao de trill di xa Kiin An vd khu vyc bao de chua xa lu Phu My khdng phit hiln As tfing so Khu vyc Tan Hoa va Tan Trang co phat hien nhung chi d him lugng thdp khoang 1,30 mg/kg - 4,75 mg/kg Vy Dong Xuin ca bin khu vuc diu co phat hi|n As tdng sfi vdi him lugng dao dgng 1,00 mg/kg - 5,4 rag/kg thdp hem nhilu lin so vdi qui djnh ve ham lupng As ttong dit ndng nghiep ciia qui chuin Viet Nam nim 2008 la 12 mg/kg Bang 7: Ket qua ham lirgng As tong so d tang mgt (mg/kg) tgi bon kfau vyc khao sat Vw Thu Ddng Dfing Xuin Bien dong ham lirgng As tfing so d dp sau cm - 20 cm Kien An Phii My Tan Hoa Tan Trung KPH KPH 1,25^ ±2,17 ' 2.02''±2,45 2,55 ± 2.32 0.87± 1,50 1,92'' ± 1,98 3,77= ± 2,41 Ghi chu: Trong mot hang cd chii cai (a b, c dj giong thi khong cosu khdc biet co y ngiiTa thdng ke a mitc 3% qua phep thu Duncan Khu vuc khong bao de xa Tan Trung hau het tr6ng mau, co ham lirgng As cao hon cac khu virc khac khu vuc su dung lugng phin b6n cao hon trung binh khoang 283,34 kg 458,06 kg/lOOOm'/thang Song thai khu vuc sir dyng nuoc ngam de tucri ti«u nen dat co ham lugng As cao hon ba khu virc Iai Dieu phii hgp vgi ket qua nghien cilu cua Tran Anh Thu, 2009 ket qua phan tich mau dat canh tac cho thiy khong phat hien Arsen ttong dat nhiJng viing khong sil dung nuoc ngam de turn Tuy tai khu vuc khong bao de xa Tan Trung phat hien ham lugng As cao hon cac khu virc lai nhimg sir khac biet khong co y nghTa thong ke Kit qua khong phat hiSn As hoa tan tai cac khu y,,c „gi,ien ciiu, As vo CO c6 thi nhanh chong chuyin bit dgng hSu hit cac loai 6k j ^ i,)ni, ,],anh mu6i sjt va nhom khong hoa tan mile dg bit dong phu thugc vao ndng cac ^^id Fe, Al dit (Ngo Nggc Hung, 2012) Vi ,,jy ,aj (.jc it|,u vuc nghien ciiu chi phat hien As ,j„g j j A ; hoa tan khong phat hien Tap cbi Khoa hgc Tnr&ng Dgi hoc Cdn Tha PhdnA Khoahgc T[r nbien Cong nghe vd Mdi tnrdng- 28 (2013): 73-79 KET LU4,N VA BE XUAT 4.1 Kit luan Khu vyc bao de trill dl xa Kiln An su dung lugng phdn bdn cao nhit nhimg ndng suit liia thdp nhit bdn kfau vuc Khu vyc Pfaii My vd Tdn Hda cd ning suit cao han Kiin An nhung vdn cd chieu hudng gidm du tugng phdn bon va ndng dupe ting Ham lygng Cu tdng sd vd Zn tfing sfi d miic thap din trang binh, kfadng cd sy khac bilt cd y nghTa tgi eac khu vyc nghiin cuu, cd xu huong gidm theo dp sau, vy Dfing Xudn thdp han vu Thu Ddng Vy Thu Dfing, ting mil, Cu hda tan cao nhit khu vyc dl bao triet de xa Kien An (15,30± 2.31 mg/kg), thap nhat khu vuc khfing 6e xa Tan Trung (10,3I±2,87mg/kg), mic du ham lugng Zn hoa tan tai Tan Trang cao nhdt (10,64± 2,31 mg/kg - 13,23±1,45 mg/kg) Ngugc lai vdi Cu, Zn; Cd tdng sd cd khuynh hudng tip trang d tang dudi, vy Ddng Xuin cao hon Thu Dfing Tgi khu vyc dl bao ttilt dl xd Kiln An Cd tfing sfi cao nhit (0,48±0,02 mg/kg - 0.63±0,08 mg/kg), him lupng thip nhit dugc ghi nhin tgi khu vyc vira xi lu xd Tin Hoa (0.29±0,03 mg/kg - 0,50± 0.01 mg/kg) Vu Thu Dfing, hdm lupng Cd hoa tan khu vyc chua xa lu thi ttin Phii My cao nhat (0,04 ±0,01 mg/kg), khu vyc khdng bao dl xa Tdn Tnmg dugc ham lupng Cd hda tan (0,03±0,0l mg/kg 0,12±6.02 mg/kg), frong dd vy Ddng Xudn Cd hda tan tdng mdt cao han nfaieu so vdi tdng dudi Hdm lugng As tong sd duoc d tang mil thap, tham chi khfing phat hien d mfit vdi vi fri Khu vyc khdng bao de xa Tan Trung As tdng sfi cao nhat ttong bfin khu vyc nfaimg khong co khic bi|t cd y nghia gi&a cdc khu vuc Kit qui ciing cho thiy khdng phat hi|n As hda tan dat d cdc vimg dl bao 4.2 De xuat Nghiin cim ddi ban hon vl him lugng cic chat cd the giy dfic tgi cdc khu vyc cd dl vd khdng de ciia tinh An Gigng dl dinh gid todn diln dugc tinh hinh tich luy dfic lgi cic logifainfabao dl tgi tinh An Giang TAI U $ U THAM KHAO Chu Thi Tham, Phan Thi Lai Nguyin Vin Td 2006 Phan vi lugng vdi cay ttdng NXB Lao dfing Ha Ndi Duong Minh Viin vi Vd Thi Guong, 2008 San xuit phin hihi eo vi sinh tii ba bCm mia Dh tii yam tgo cdng nghe Bd mdn Khoa hpc Ddt - Khoa Ndng nghiep & SHUT) Tnrdng Dai hgc Can Tfaa Duong Minh Viin, Vd Vdn Binh, Huynfa Tfai Thu Huong, Vd Thj Guong, 2010 Anh hudng ciia phii sa len ndng sudt liia vi mdt sd tinh chat ciia dit Ki yeu Hdi nghi khoa hpc phdt frien ndng nghiip ben virng thich irng voi bien ddi hdu NXB Ndng nghiip Hfi Thi Lam Trd, 2005 Sy ticfa luy kim loai ning ttong ddt ndng ngfaiep vd nudc ogim d xa Dai Ddng huyen Vdn Lam, Hung Yin Tap chi Khoa hpc Dit sd 21 Liln hiep eic Hfii Khoa hpc vi Ky thugt Vi?t Nam Hdi Khoa hpc Dal Viet Nam Trudng Dgi hpc cin Tho Ll Thi Thiiy, Pham Quang Hi, 2008 Danh gii thyc trgng Cu Pb, Zn, Cd dit ndng nghiep Viet Nam giai doan 2002 2007 Tap chl khoa hpc ddt sd 29 Lien hiep cac Hpi Khoa hpc va Ky thugt Viet Nam Hpi KhoafapcDat Vilt Nam Trudng Dgi hpc Cdn Tho Ll Vdn Khoa, 2004 Sinli thai va mfii truong ddt NXB Dai hpc Qudc gia Ha Npi Ngfi Ngpc Hung, 2005 Thyc tap tfafi nfauong Tnrong Dgi hpc Can Tha Ngd Ngpc Hung 2012 Gido ttinh Dfic chit hpc mdi tmdng dat NXB Dgi hpc Can Tho Nguyin Nhu Bd 2006 Thd nhudng ndng hda NXB Ha Ndi 10 Phgm Ngpc Xuan, 2004 Luin vdn thgc sT khoa hpc mdi trudng "Chat lugng mfii trudng ddt d cic viing de bao kilm soat IQ thudc huyen An Phii - Chg Mdi tinh An Giang" Trudng Dai hpc Cin Tha 11 Sd tai nguyen mdi tradng An Giang 2008 Bio cio tdng hgp quan fric hiln ttgng mdi truong tinh An Giang nim 2008 12 Trin Anh Thu, Trin Kim Tinh, Vd QuMig Minh, 2009 Nghiin ciiu nguon gay nhilm Arsen nudc ngdm tai An Phii, tinh An Giang Hdi nghi khoa hpc - cong nghe nam 2009 Tnrdng Dai hpc Cdn Tha ... Ngpc Xuan (2004) da cd su hipn diln cua kim loai nang ttong dat vimg tham canh lua khu vyc cd de bao Dl tii "khao sat ham lugng As, Cd, Cu, Zn tgi viing dl bao kiem sodt lij tinh An Giang'' " dugc... de bao kilm soat IQ thudc huyen An Phii - Chg Mdi tinh An Giang" Trudng Dai hpc Cin Tha 11 Sd tai nguyen mdi tradng An Giang 2008 Bio cio tdng hgp quan fric hiln ttgng mdi truong tinh An Giang. .. cd thi mang lgi cho dl bao Bang 5: Ket qua ham lugng Cd tdng si dat Khu virc Kien An Phii My Tan Hoa Tan Trung ngan lu Do ham lugng kem hfia tan cao nhat d khu vyc khdng de bao xa Tdn Trang sau