D^m Xuan Van vd Dtg Jap chl KHOA HQC & CONG NGHE 107(07). 91 -96
NGHIEN c i r u SU' PHAN BO, KHA NANG SINH TRI/OTNG VA PHAT TRIEN CUA CAY S,^Y (Pliragmiles aulralis) TREN DAT SAU KHAI THAC QUANG TAI TiNH THAI NGUYEN
Diim Xuiin V?n,Tr^n Thj Pha', Dang Van Minh, Hoing V3n Hiing Tnrdng Dai boc \6iig Ldm - DH Thiit \g,i}eii TOMTAT
Nghien cuu su phan bo, khi nting sinh trudng. ph^t trien va hap thu kim loai n^ng ciia cay say tren dat sau khai thac qu?ing tai Thai Nguyen cho thay rSng c^c dia hinh khac nhau thi sy phan bo cung khac nhau. tan .xuat xuat hien cay Say la nhiSu hem tai cdc noi co dig hinh thap, gan nguon nude, cang ien cao thi sy xuat hien cdng giam ddn. Cay Say thich nghi va sinh truang, phat Irien tot tren cac mo khai th^c qu?ing, chieu cao trung binh cay dat tir 1.2 - 1,9 m, chieu dai Id dat trung binh 0.35 - 0.45 m. chi^u dai re trung binh tir 0.2 - 0.3 m. Ham luang kim loai n|ing As, Pb, Cd trong ddt sau khai thdc khodng san tai mo chi kem Cugi Nac, mo titan cay Chan, mo s3t tral Cau va mo chi k§m L^ng Hich dSu vugt qud nhieu lan tieu chuan cho phep trong dat nong nghiep ciia quy chuan Viet Nam,
Til kh6a: Hdp thu. kim toai ndng. khai khodng. cdy sdy DAT VAN DE
CJ Viet Nam hien nay, cay Say fPhragmiles aiitralis) cd nhieu trong tu nhien d nhieu tinh thdnh va dirge sd dung vdi cdc muc dich khac nhau nhu: chdng \di mdn, sal Id va irng dung sd ly nude thai cira sdng va phong chdng thien tai. Vdi nhdng tinh ndng virgt trgi, cay Say cdn su dung de xu ly ddt d nhiem, trong dd cd d nhiem kim logi nang, Tgi cdc khu vuc md khai thac quang Thdi Nguyen, cay say thich nghi va phan bd nhieu hon tgi cac khu vuc bai thai sau khai thac qudng.
N O I D U N G V A PHUONG PHAP NGHIEN CU'U
Doi tirong nghien cdu
Ddi tugng nghien cuu la ca\ Say (Pbruginiies australisj, la mdt loai cay Idn thugc hg Hda thao(Poaceae) cd ngudn gdc d nhung vimg dat lay d ca khu vuc nhiet ddi va dn ddi tren the gidi.
Noi dung nghien cdu
+ Dieu tra sy phdn bd, kha nang smh trirdng va phdt trien cua cay Sa\ trong cdc khu khai thac quang. so sanh mat do va sy phdn bd d cac md khai thdc khac nhau.
Tei: 0982.091200. Emad phac-am2004^d>yalwo c
+ Nghien cdu kha ndng hap thu kim loai ndng CLia cay Say tren dat sau khai thac quang khodng sdn.
Phu'O'ng phap nghien cuu Phuvngphdp dieu tra thu thgp tdi lieu - Thu thap sd lieu ve dieu kien ty nhien - kinh te - xa hoi ciia cac khu vyc khai thac md quang tren dia ban tinh Thai Nguyen, Phtrffng phdp ke thira
- Thu thap tai lieu, sd lieu ve tinhbinh dat bj d nhiem KLN tgi Thai Nguyen
Phirong phdp khdo sdt thuc dia vd lap d tieu chudn (OTC)
- Phuang phdp lap d tieu chuan (OTC) Lap d tieu chuan de nghien cdu sy phan bd ciia cdy Say trong khu vyc khai thac md. OTC phai bd tri tgi cae vi tri cd tinh dgi dien cao d cdc khu vyc, dia hinh phdi tuang ddi ddng nhdt.
+ Cach lap OTC: Lap d tieu chuan vdi chieu ddi cimg hudng vdi dtrdng ddng muc, chieu rdng vudng gdc vdi dudng ddng muc, dien tich mdi OTC la 1000 m" vdi chi^u dai d la 50m. chigu rdng d la 20 m. Cac OTC dai dien cho cac dja hinh vimg dat trung. ddt bang, sudn rdc, dinh niii trong khu \uc khai thac Phtrffng phdp xdc dinh sinh khiii thuc vgt Cdc lodi thyc vat lira chgn nghien ciiu sau khi ldy vg phdng thi nghiem dugc rira va lau bang
Dam Xuan Van vuDig Tap chi KHOA HQC & CONG NGHE 107(07}-91 -96 khan sgch roi dem can tren can dii;n tir tgi
phdng thi nghigm, Mau dgi di?n cho 3 mirc chidu cao, Sau khi can xong dem say d dO- 70''C trong 7 gid roi dem can Tiep tyc say den khi khdi lugng khdng doi. Can Igi va lay gia tri cuoi cimg.
Phirtrng phdp phdn tich ilal vd thirc vgt - pH(KLh: Dugc chicl bdng dung djch KCI IN, do bdng may pi I inciet. i\ 1^ dai nude la 1/2,5 - Chat hiiu co xac djnh bang phuong phap Dumas tren thicl bj phan lich da nguyen td CNS TruSpec I.IXO USA.
- Xac djnh ham lugng KLN trong dat va trong cac loai thyc vat bdng may ASS M6 Thermo.
Phirtrng phtip .v«' ly .\o lieu
- So lieu dugc tong hgp, phan tich vd xir ly bdng phan mein MS Excel va SAS 9.0 KRT QUA NGHIEN CUU VA THAO LUAN Di€u tra sy phan bo, kha nang sinh trudng va phat trien cua cay sdv trong khu vyc nghien ciru
Sir phdn bo cua cdy Say
Tien hdnh khao sat viing thuc bi tren dat sau khai thdc quang kim loai tai cac md trong
Bang 1. Su phdn bd cua cdy Sdy tai mdt
vimg nghien cuu bdng phuang phap lap d tieu chuan. OTC dugc bo tri tgi cdc vi tri cd dia hinh tirong ddi ddng nhdt d chan ddi, sudn ddi va dinh doi, Dien tich mdi d tieu chuan Id 1,000 m^ (chieu dai OTC 50 m. chieu rgng OTC 20 m).
%\\ phan bo ciia cay Sgy dugc trinh bay d bang 1.
Bang 1 la kdt qua cho thay sy xuat hien cua cay Say tren cac didm md dieu tra la khac nhau. Trong sd cac md dugc khao sat thi cay Say cd sy phan bo rgng. Cay Say thich nghi vd phan bo rgng tgi cac khu vuc cd ndng do 6 nhiem kim loai ndng cao. Md cd sy phan bo cdy Say Idn nhat Id md chi kem Lang Hich (494 khdm /OTC) tiep dd la d md sdt (175 khdm/ OTC) va md Titan (57 khdm/OTC) va md chi kC-m Cudi N^c (37 khdm/OTC).
Trong cac dja hinh khac nhau thi su phdn bo cung khac nhau. tai cac noi cd dig hinh Ihap.
gdn nguon nude thi tan xuat xuat hien cay Say Id nhidu hon. Cang len cao thi sy xuat hien cang giam dan.
Trong cimg mdt md khai thdc thi tgi cac dia didm gan cdng thdi, be xu ly nude thai thi cay Say xuat hien cdng nhieu.
50 mo khai thdc trong khu virc nghiin cuu S6TT
OTC Vi tri OTC So lu'9'ng (Khdm/OTC)
So lu-ong la khdm) S6 luQ-ng Min iCdy'OTC) M6 chi kem
Cuoi Nac
01 Thung liing 02 Sudn doi 03 Dinh ddi
37 34 27
333 408 324 04 Thung liang
Cay Tram
57 34 27
15 29
Trai Cau 07 08 09
Chan doi Sirdn doi Dinli doi
175 87 77
45 54 47
3 4 6
3675 1458 2387 Mo chl kem
Lang Hich
Ven suoi Bai bang Sir&n d6i
175 494 121
175 9
1575 2964 968 Kltd niing sinh trirdng vd phdt trien ctia cdy Sdy
Banh gid suphdt trien cuu cdy Sdv Iren khu vice nghien cini Sir sinh truang va phat tnen cua cay Say dugc the hien a bang 2.
92
Ddm Xuan Vgn vd Dig Tap chi KHOA HQC & CONG NGHE 107(07): 91 -96 Ket qua quan sat cho thdy su phat tridn ciia
cay Say tren cac md la khd dong deu, chung td cay cd khd nang thich nghi cao ddi vdi mdi trudng d nhilm kim loai ndng.
Cay Say tren cac md khai thac quang sinh trudng va phat trien tot, chieu cao trung binh cay dgt tu 1,2 - 1.9 m. chidu dai Id dgt trung binh 0,35 - 0.45 m. chieu dai re trung binh tir 0.2 - 0,3 m,
Dja hinh cd dnh hudng id ret den su phat tri^n ciia cay Say. d nhung noi dja hinh thap. gan
Bang 2: Su smh tnrang vd pluil Iriei
ngudn nude cd dg am cao thi cay sinh trudng phat trien mgnh hon nhirng noi cao.
Tgi noi gdn cdc cdng thai, be xu ly nude thai hay giap xudng che bien thi cay Say phat trien mgnh hon cac khu vyc khac, Trong khu vyc nghien cdu dieu tra cay Say ludn cd sy xuat hi^n mgt so loai cay khdc nhu: lau, re, xuyen chi, duong xi....
Sinh khdi cm cdy Sdv Iren cdc md khai thdc Ket qua xdc djnh sinh khdi thyc vai dugc the hi^n tren trong bdng 3,
ciia cdy Sgy trin khu virc nghien cuu
Diem mo Mo chl
kgm
Nac M o Titan Cay Tram Mo sat
Trai Cau Mo chi
kem
Hich S6 OTC
01 02 0 3 04 0 5 0 6 0 7 0 8 0 9 10 11 12
So luong (Khdm,' OTC)
3 7 3 4 2 7 57 3 4 2 7 8 7 175 7 7 175 4 9 4 121
s4 lugng (Car/
OTC) 333 4 0 8 3 2 4 5 1 3 4 4 2 5 6 7 1458 3675 2387 1575 2964 9 6 8
Chlcu cao eSy (cm) Ma.v Mm 2.32
1.9 1.8 1.6 1.8 2.2 2.7 2.67 2.68 2,7 2.3 1.7
0.9 O.S 0.8 0.6 0,5 0,8 0,9 0.9 I . l 0.8 0.5 0.7
Chieu dfii 14 Icm) May A fin
6 5 57 6 0 6 2 57 51 4 7 45 41 72 3 7 5 9
22 19 16 33 31 2 9 9 8 9 8 8 9
Chiiu
.Mat 6 0 4 0 4 0 45 58 4 6 55 5 0 4 6 55 52 4 9
ddi re 'Si
!l4ln 9 7 5 8 12 9 5 n 7 6 8 6
Ou6ng kinh thiin TB
(cm) 0.3 0.35
0.3 0.3 0.4 0.4 0.3 0.35
0.4 0.35 0.15 0.3
Tinh hinh phat trien T o t T B T 6 t T o t T o t T B T o t T o t T o t T o t T o t T B
Bang 3: Ket cpid xdc dinh sinh khdi cdy Sdy tren cdc md nghie S& lugng
T OTC (Khdm/
OTC)
Khoi luong tuoi/khom
la
Khoi luong (uoi/OTC (gl
Khoi luong khS/ofc
1
2
3
Mo chl kem Cuoi Nac M6 Titan Cay Tram
Mo sat Trai Cau 01 02 03 04 05 06 07 08 09
37 34 27 57 34 27 175 87 77
960 1394 850 765 1280 1050 1560 2465 1755
31450 47.396 25 920 43 605 43 520 28.350 273.000 214455 135.135
6.604.50 9.953.16 5.443.20 14.389.65 14 361.60 9.355.50 66 885.00 52.541.48 33.108.08 M6 chi kgm
Lang Hich
175 494 121
945 126 405
165.375 62 244 49 005
58.377.38 21.972.13 17.298.77
Qkm Xuan Van VM Dig Tap chl KHOA HQC & CONG NGHE 107(07): 91 -96 Can cir vdo ket qua dieu tra thyc dja va bdng
3 ta thay sinh khdi cay tai cac md cd sy khac biet Idn, Tai md sdt Trgi Cau cay sgy phan bo nhieu. kha ndng smh trirdng va phdt iricii tot, sinh khoi cay khd Ircii d lieu chuan cao (33.108 - 66.885 kg/0 TC). Md chi kem Lang Hich cd sinh khoi kho dgt 17,298 - 58.377 kg/OTC. md litan Ci'i>' Tram cd sinh khoi dgi 9355 - 14.389 kg/OTC va md chi kem t ugi Ndc cd sinh khoi 5.443 - 9.953 kg/OTC, Kha niing hiSp (hii kim loai nang ciia cay Sd> tren diil biii thai suu khiii thac qudng Hien trgng o nhiem liim logi ngng Trong qua trinh khao sdt tgi khu vyc nghien cuu. tdi da lien hanh lay mdu dat va tap chung phan tich ham lugng Idng sd cua 4 nguyen td, dd la: As, Pb. Cd, Ket qua phdn tich dugc the hien trong bang 4.
Td kdt qua phan tich dat tai bang 4 la thdy.
trong tat cd cdc mau phan tich deu chua hdm lugng cua 3 nguyen td kim logi nang. Tuy nhien, dieu ddng chii y dd la tat ca cdc mau
Bang 4. Kci qua phdn tich mdu kim
phan tich d6u cd ham lugng kim loai ndng vugt qud quy chuan cho phep, Cu the:
Tgi md chi kem Cugi Ndc ham lugng Pb cao hon tu 4,2 - 4.8 Idn, ham lugng Cd cao gdp 10 - 17 Idn. ham lugng As cao hon gap 14,6 - 20.8 lan tieu chudn cho phep.
Md litan Cay Tram I cd, ham lugng Pb cao hon tu 2.7 - 7.1 ISn. hdm lirgng Cd cao gap 13 - 15 lan, ham lugng As cao hon gap 9,5 - 21,3 lan tieu chuan cho phep.
Md sdt Tral Cau cd ham lugng Pb cao hon tir 2.4 - 5.1 ian. ham lugng Cd cao gap 15.5 - 18.5 Idn. ham lugng As cao hon gap 15,1 - 33.6 lan tieu chuan cho phep
Md titan Cay Tram 2 cd ham lugng Zn gdp tir 5.7 - 8,7 Idn, ham lugng Pb cao han tu 10,2 - 25,8 Idn, ham lucmg Cd cao gap 1.49 - 3,4 Idn. ham lugng As cao hon gap 4.4 - 12,8 lan tieu chuan cho phep.
Md chi kem Lang Hich cd ham lugng Pb cao han tu 14.5 - 18.4 lan. ham hrgng Cd cao gap 2.3 - 2,8 lan, ham lugng As cao hon gdp 5 -
10.8 lan tieu chuan cho phep.
loai ndng tui khu vuc nghien ciru
Mo chi - kem Cuoi Nac
Mo Titan City Tram 1
Mo sat Trai Cau
Mo Tiian Cay Tram 2
Mo chi - k5m Lang Hich
QCVNO32O08/BTNMT KH Mau Dl D2 D3 D4 D5 D6 D7 B8 D9 DIO D i i DI2 D13 D14 D15 D16
Pb (mg/kg) 321.98 342.80 291.24 340.56 189.92 351.68 225.98 375.68 357.12 174.84 1566.89 718.23 1810.52 1293.62 1016.24 1137.93 70
Cdc chi tieu Cd (mg/kg)
34.38 .52.82 21.18 24.96 18.24 30.48 26.34 37.14 35.22 31.44 6.81 2.99 5.69 4,64 5.76 2.79 2
As (mg/kg) 185.49 176.70 250.31 114.39 141.75 2,56.12 220.94 269.64 182.35 404.01 53.64 154.80 121.05 61.20 122.40 130,05 12
Dam Xuan Van va Dtg Tgp chi KHOA HQC & CONG NGHE 107(07): 91 -96 Kltd ndng hup thu kim logi ndng ctia city Sgy tren dat bdi thai sau khai iliac qudng De danh gia kha nang hiit kim logi nang tai vimg ddt d nhiem sau khai thac quang. Iren mdi diem md nghien cuu tidn hanh ldy loan bg re, than, la cua 03 mau cay Say dgi di^n cho cac didu kien dia hinh khac nhau (chan ddi, su'dn ddi, dinh ddi), bao qudn rdi mang ve xir ly va phan tich ham lugng cac KLN Pb, Cd, As trong cac bg phan cua cay. Ket qua phdn tich trinh bay d bdng 5,
Bang 5: Kha ndng hap ihti KLN cua cdy Sgy tren ddt bdi thai sau khai thdc DVT mg/kg Md Khai T h i c
Mo chl - kem Cu9i Nac
K H Cl C2 C3
Than + la Pb
25.52 20.42 33.47
Cd 7.95 6.43 5,84
As 19.67 16,26 31.64
Pb 80.17 68.45 144.27
Re Cd 19.68 17.48 23.03
As 167.69 161.65 190.72
Mo Titan Cay Tram 1
C4 C5 C6 C7
34.75 45.31 47.90 55,88
6.36 7.94 8.83 6.29
15.17 24.29 32.39 16.67
163.69 92,51 100.48 112,36
25.93 20.04 27.62 33.38
113.67 172.15 233.81 187.94 Mo sat Trai Cau
Cay Tram 2
Lang Hich C8 C9 CIO CM C12 C13 C14 C15 C16
30.43 33.46 36.48 70.47 75.54 66.63 72.42 76.58 75.45
8.08 8.49 8.89 3.93 1.75 0.96 7.43 2.45 1.25
32.33 30.43 34.53 8.68 25.35 22.38 7.96 13.27 16.20
97.78 102.40 108.96 196.21 161.86 161.05 137.97 131.34 154.62
26.13 27.35 28.57 6.45 3.62 5.14 3,33 5.13 2.76
197.37 173.23 308.96 60.26 80.67 92.42 104.10 126.64 93.93 Ket qud phdn lich cho thdy ham lugng kim
loai nang trong tdt ca cac mau phdn tich ciia cay Say deu rat cao
- Ham lugng cac nguyen td kim loai ngng hap thu trong cac md khai thac Id khdc nhau, cu the' Ham lugng Pb trung binh hap thu trong md chi kem Cudi Nac la 62,05 mg/kg, md litan Cay Tram I Id 81.61 mg/kg, md sat Trai Cau 68,25 mg/kg, md titan Cay Tram 2 la 121,96 mg/kg vd md chi kem Lang Hich 108,26 mg/kg.
Ham lugng Cd hap thy trung binh Irong md chi kem Cudi Ndc trung binh la 13,04 mg/kg. md titan Cdy Trdm 1 la 17,04 mg/kg, md sat Trgi Cau 17,91 mg/kg, md titan Cdy Trdm 2 la 3,64 mg/kg va md chi kem Lang Hich 3,72 mg/kg Ham lugng As hap Ihu trung binh trong md chi kem Cugi Ndc trung binh la 97,93 mg/kg, md titan Cay Tram I Id 99.51 mg/kg, md sat
Trgi Cau 129,47 mg/kg. md titan Cdy Trdm 2 la 48,29 mg/kg va md chi kem Lang Hich 60,35 mg/kg.
- Ham lirgng kirn loai ndng hap thy ciia cay Say trong re Idn hon so vdi than la, Tai md chi kem Cudi Ndc ham lugng Pb gdp tu 3.14 - 4,31 lan trong than id, hdm lirgng Cd gap lu 2,45 - 3,94 lan, hdm lugng As gap td 6,02-9,94 Idn,
Md Titan Cay Tram I ham luong Pb gap tu 2.01 - 4.71 Idn trong than Id, ham lugng Cd gdp tu 2,52 - 4,30 lan. ham lugng As gdp tir 7.08- 11,27 Idn.
Tai md sdt Trai Cau ham hrgng Pb gap lu 2,98 - 3,21 lan trong than la, ham Itrong Cd gdp tir 3,21 - 3,23 lan, ham lugng As gap tii' 5,69 - 8,94 lan.
95
Dam Xuan Vgn vd Dtg Tap chi KHOA HpC & CONG NGHE 107(07): 91 -96 6 md Titan Cay Tram 2 ham lugng Pb gap tu
2.14-2,41 Idn trong than Id, ham hrgng Cd gdp tir 1,64 - 5,35 lan. ham lugng As gap tir 4,12 - 6,94 lan. Tgi md chi kem Lang Hich hdm lirgng Pb gdp tir 1.71 - 2.54 lan. ham lugng Cd gap td 31.61 - 5,35 lan. ham Krgng As gdp lir 5,79 - 13.07 lan,
KRT LUAN
+ Trong so 5 khu vyc md khai Ihdc dugc khdo sat thi cay Sgy cd sy phan bo khac nhau.
Trong cdc dja hinh khac nhau thi sy phan bo ciing khdc nhau, tai cac noi cd dig hinh thdp.
gan nguon nude thi tan xuat xudt hi?n cay Say la nhieu han, Cang len cao thi sy xudt hi?n cang giam ddn, Trong cimg mgt md khai thdc thi lai cdc dja diem gdn cdng thai, be xu ly nude thdi thi cay Say xuat hien nhieu hon.
Cay Sa\ tren cdc md khai thdc quang thich nghi va sinh trudng sinh trudng. phat trien tdt, chidu cao trung binh cay dgt lu 1,2 - 1,9 m.
chieu dai la dat trung binh 0.35 - 0.45 m, chieu dai re trung binh tu 0,2 - 0.3 m.
-(- Hien Irang d nhiem mdi trirdng ddi sau khai thac khodng san tgi md chi kem Cugi Nic. md litan Cay Tram, md sal trai Cau vd
md chi kem Lang Hich dugc ddnh gia thdng qua ham lugng kim loai ngng cua 3 nguyen td Pb. Cd, As trong ddt deu vugt qua quy chudn cho phep trong dat ndng nghiep ciia Vi?t Nam nhieu lan
TAI LIEU THAM KHAO 1. Le VJSn Khoa. Nguyen Xudn Cy, Trdn Thien Cudng, Nguyen Dinh Giap, 2010, Gido trinh "0 nhiim mdi Irm'rng dat vd biin phdp xir ty", Nxb Gido dye Vict Nam, Ha Npi-
2. Le van Khoa. 2007. Chi thf .smh Hbc mdi trin'rng, Nhi xuat ban Gido dye. Hd Ngi.
3. Trdn Thj Phd (2009). Su tich lily KLN trong ddi vd thirc vdl tai khu vuc mo sdt Trgi Cau • huyen Ddng Hy - linh Thdi Nguyin. Ky yiu Hpi nghj khoa hpc tre loin Quoc khoi Nong - Lam - Ngu - Thuy nam 2009. lan thu 5. trang 359-364 4. Trdn Thi Pha (2012/ Nghien ciru khd ndnglich t^ mdt .so KLN trong ddt vd trong ri cdc lodi thirc vgt chu yiu Igi khu virc khai thdc qudng a huyin Ddng Hy. tmh Thai Nguyin. D€ tai cap Bp. ma sfl B20I0-TNO2-I0.
5. Luang Thj Thuy Van (2012), "Nghien cuu su dung CO Veii\cr di cai tgo ddt bi d nhiem Pb. As sau khai thdc khodng son a ttnh Thdi Nguyen", Ludn an ti^n s). Khoa hgc mdi trudng. Tnrdng Dgi hoc Ndng lam - DH Thai Nguyen.
SUMMARY
RESEARCH ON THE DISTRIBUTION, GROWTH AND DEVELOPMENT ABILITY AND HEAVY METAL ABSORPTION BY REED PLANT {Phragmites autralis) ON LAND AFTER MINED IN THAI NGUYEN PROVINCE
Dam Xuan Van, Tran Thi Pha", Dang Van Minh. Hoang Van Hung Tlwi \guyfn Lniversity- oJ Agricullure and Forestry Study the distribution, growing and development ability and absorb heavy metals of reed plant on land after mining in Thai Nguyen province has showed that the reed plants were distributed in the different terrain. The frequency of the reed is much more al the low topography place and proximity to water and the opposite is descending Reed plants adapted and grown well on ore mines, the average of plant height from 1,2 to 1,9m, leaf length averaged 0,35 - 0 45m, the average of root length from 0.2 to 0.3m Mca\> metal content of As. Pb. Cd in the soil after mining lead-zinc mine (Cuoi Nac), titanium mine (Cay Tram), iron mine (Trai Cau) and lead-zinc mines (Lang Hich) are overed several times ihe Vietnamese standard regulation which allowed in agricultural land.
Key words- absorption, heavy metal, mining, reed
Ngdynhdnbdi. 29/3/2013; Ngdy phan bien:24-5/2013. Ngdy duyit ddng 10/9/2013 Phdn hiin khoa hoc: TS. Nguyin Chi Hieu - Trudng Dgi hoc Ndng Ldm - DH Thdi Nguyei
Tei 0982 091200. Email. pliauimKm'ayalmo com 96
