T^diiDIACHAT.fcialA-s6 3l9 7-lt;20IO. g. 69-75
NANG CAO CHAT LlTONG GIA CONG, PHAN TICH DINH LirpNG QUANG TITAN-ZIRCON TRONG
SA KHOANG VEN BIEN
NGUYSN THI DAO, HOANG rtJU LANG
Phdng Phdn tich Thi nghiem Lien doim Dia chdi Bdc Tnmg Bo. Vmh. Nghe An Tdm ldi: Kit qud phdn tich miu Irgng sa dugc su dung ldm ca sd di ddnh gid Mr lugng vi Hi nguyin dg bdo cua sa khoing ven biin. do vgy viic ndng cao chdt lugng cang Idc phdn logi. phdn lich miu sa khoang ven biin li mdt yiu cdu cdn tfiiit.
Viic dp dgng quy trinh phdn tich dinh lugng cic khoing vdt Irong mdu sa khoang ven bien theo Tieu chudn ca sd TCCS 0I:2010/BCKS do Cue Bia chdt va Khoing sin Viii Nam ban hinh giup cho viic phdn tich mdu ddm bdo chdi lugng theo yiu cdu. Trong qud trinh phdn logi. phdn lich miu can ndm ro dgc diem ve thinh phdn. dg hgt cua mdu vi diiu chinh khoi lugng mau ban ddu cho phii hgp. dong thdi thgc hiin tdt til cd cdc khdu trong quy trinh phdn tich trong di chuy khdu cm xic dinh o-gng lugng cing ldc kiim Ira va ghi kit qud.
Bai bio neu tin mgi so giii phdp eg thi di ning cao chit lugng phin lich mdu
I. SO Luxjc Bic a e u THANH PHAN VAT CHAT QUANG TTTANilRCON TRONG SA KHOANGVENBI^N
Theo cie ket qui nghign cdu hien cd, thanh phin khoing vat cua quing titan- zircon sa khoing ven hiin gdm cd cac
vimg ven biSn tii Ha Ttnh trd vio d^n Thira Thien Hue, tram tieh cd dp chpn lpc khi tot, quang cd dp hat trung binh (chu yeu >q,l mm), lupng sft 5-20%. 0 viing ven biSn tir Ninh Thuan, Binh Thuan vio Bie Bi Ria - VOng Tau quSng titan-zircon
„ . „ . . . „ . „ „ . 5 . . . . „ . „ , g„,„ ^„ ^^ racBaKia- Vung Tau quSngtitan-zirec . " " ! « o ? ^ i*"""^ ' ^ " ^^ '"'''''• " " * " ^ •«'°8 * • ? " • « '=° * M i phin e, anh =• 40-95; felspat = 1-15; mica = 1-10: ^i hftt „3„ v l . vki ,k. i .^ _,.:!
anh =• 40-95; felspat = 1-15; mica = 1-10;
tourmalin, staurolit, spmel = 0-2; sdt, mim
= 1-60; vi khoing vjt cd ich (%): ilmenit
= 0-20; leucoxen, anatas, rutil = 0-0,5;
zircon = 0-1,5; monazit = 0-0,5; chromit»
0-2; cassiterit. granat hiSm gip, vdi ham lupng thip. Kich thude hjt quSng ehii yiu nhd hon 0,5 mm, trong dd d0 hat 0,05- 0,15 mm chiim tiin 75%.
Thanh phin, dp hat eua uim tieh chua khoing vjt qujng diay ddi manh theo die diem dja chat eua tung viing. Vimg ven bien Thanh Hoi chii yeu l i sft pha cit, dp h»t qujng rit nhd (ehii yiu <0,2 mm), lupng sdt tii^20 din 40%; vilng ven biin Ngh$ An, tram tich ed dp hat nhd - trung binh, d^ chpn Ipc kem, d0 h^t quing chii yiu l i 0,05-0,5 mm, lugrng sft: 10-30%;
set, bpt gin kft khi tdt. lupng sft chiim khoing 10-50%, cd noi len tdi 65%, dp hat quang ehu yiu < 0,2 mm, him lupng qujng: 0,3-1,5%.
1. DJc diim cic Idioing vit quing ehii yeu
/ . / . Ilmenil-FeTiOj (TiOi: 52,56%;
FeO: 47,44%): Tinh thi d ^ g hat, dang manh,_ ngoai ra cdn cd mpt sd dang tim, mdt sd hat cd hinh thoi. Cic h»t cd dd mii ttdn tir trung binh din eao, kich thude hat ddng diu, ehu yiu <0,2 mm. Ilmenit cd miu den, nau den, anh ban kun, tir tlnh manh, din dien. Ty ttpng: 4,72,
1.2. Ruia-TiOi: Tinh thi vS, d ^ g hat khdng nguyen ven, ddi khi gap darig ling trv cd vft khia ehay dpc tinh thi. Cie hat
69
ed dp mai trdn trung binh din cao, cd hat
<0,2 mm. Da sd h ^ rutil cd mau nau, dd nau, inh kim cuong, khdng tir tinh, din d i ^ T;^ ttpng: 4,2.
1.3. Leucoxen-Ti02: Dang hat meo md trdn canh, ddi khi gap tam mdng 6 c^inh do bien ddi tir ihnenit. Dp mai ttdn kha tdt, khi ddng diu, kich thude hat <0,2 mm. Cie hat leucoxen ed mau xim tring xim, nau xam din ca phe sita, anh md, khdng tir ttnh, din dien; ty trpng: 4,0.
1.4. Anatas-TiOj: Da sd dang hat meo md vi dang manh, hiem khi ggp dang ling ttu va thip. Cic hgt cd dp mai ttdn tot, miu xam xanh, xim vang, niu nhat, inh kim cuong, bpt nghiin mau xim.
1.5. Brucit-MgfOH): Dang tim vo.
manh vd, miu niu dd, inh kim cuong. Cic hat cd dp mii trdn tdt, kich thude <0,2 mm.
1.6. Zircon-ZrSiO, (Zr02: 67,1%;
SiO:: 32,9%): Da sd zircon cd dang tinh the hinh litig ttv 2 thip 4 phuong, mpt sd Itag try ngin tuong ddi ding thude, mpt so dgng minh yd khdng nguyen v?n; dO mii trdn cao, hiu hit ttdn canh, miu tim nhgt phdt hong, niu nhat, tting ttong sudt, inh kim cuong, lihdng tir tinh, khdng dan di?n. Ty trpng: 4,7.
1.7. Monazil-(Ce,Le,Th...)PO,: Tinh the dgng hgt ttdn eanh, kich thude nhd ddng deu, mau ving chanh, ving lye, inh thuy tinh, inh md, cd dp phdng xg, din difn. Ty trpng: 4,9-5,5.
Cie khoing v | t . nia trin thudng xuy6n di cilng nhau; giaa chung ed mii li&i quan ch|t ch5 vdi nhau (hi sd tuong quan eiia nhdm khoing vjt titan vi zircon tir 0,25 din 0,997). Do qujng ed dS hgt nhd vi lin khi nhiiu s<t, vi|c gia cdng, phin logi va phin Uch mlu ttpng sa ddi hdi phii nim rd djc diim v l thinh plum, dp hgt cua mlu v i dieu chinh khdi lupng mlu ban diu cho phu hpp vdi die diem mlu.
II. atSY TT*IH P H A N TlCH MAU SA KHOANG VEN B l t N TRlHtiC D A Y V A N H O N G TONTAI
Trong giai dogn 1985-1995. cac don vj thupc Cyc Dia chit va Khoing sin VN da dieu tra, danh gii tiim ning quing titan- zircon sa kht)ing chu yiu trong ddi tupng tram tich biSn-gid phan bd d viing ven biin cac tinh Ha Tinh, Quang Binh, Quang Tri, Thira Thien Hui, Binh Djnhi Phu Yen, Ninh Thugn va Binh Thugn. Di xic dinh ham lupng q u ^ titan-zircon, dg ap dung phuong phap phan logi va phan tich theo quy trinh co ban sau:
1. Miu lei khoan, mlu ttpng sa ty nhifin sau khi lay du^c rtit gpn d thyc dja din ttpng lupng khoing 200 g, ehuyin vi phan logi, phin tieh d phdng thi nghiem;
2. Tgi phdng thi nghiem, mlu dupe say khd, sing lpc qua ray I mm di logi bd vd so oc, que, li, sau dd dd Mn tim kinh tr^n deu chia ddi dinh liy trpng lupng 30-35g di phin logi, cdn Igi luu. Phin mau dua phan logi dupe can bing can kJ thugt c6 dd chfnh xio 10"^ g, sau dd dem phin logi tir bing nam chim, tieh phin tir cim, di^n tir vi khdng difn tit njng (khdng dii ttong nude);
3. Phin khdng didn tir ning dupe dem lpc bromoform d i tieh phan ning v i p h i n nhp;
^ 4. Phin n5ng v i phin nhe sau lpc dupe siy khd, cin, rieng phin nh? dupe kiim tra dudi kinh d i phit hi^n cie khoing vgt nJng cdn sdt, niu cd khoang vgt nfing sol
¥ , tiep tyc lpc bromoform phin nhf cho den khi khdng cdn khping v§t nJng lin ttong phan nh?. Sau dd can cie phln tir cim, di$n tir, khdng di$n tit n^ng, khdng di|n tir nhe v i dem phin tich dudi kinh hiin vi;
5. Di phin tfch, thudng liy mdt lupng m^u dgi di$n eho mau phan Uch, sau dd rii diu hoic rii thinh cic dii hfp tt«n tim kinh, soi kinh phit h i ^ chpn v i nhdm
cic khoang vat cin xie dinh va dinh gii
% the tich hoic can true tiip (niu can dupe), tir dd tinh dupe % eac khoang vat can phin u'eh.
Quy ttinh neu tten dupe ki thira vi phit trien tir quy trinh phan tich mlu trpng sa thien nhien eiia Uen Xd (cu) va ciing tirong tu quy trinh phan tieh xac dinh him Iupng eic khoang vat cd ich ciia Australia da ap dung khi danh gia tii nguyeri, trir lupng quing titan-zircon viing ven bien H i TTnh. l/u diem eda qua trinh niy li tuy phan tieh khoang vgt va lupng mlu dua vio phin tich khdng phii 100%
nhung dp chinh xic van kha cao do kich thude cie hat khoing vit ed ich ttong
• ^ lg titan-zircon sa khoing ven biin diu hgt va chiing phan bd rit ddng , I vice danh gii % khoing vat phy
thupc vio kJ nSng v i kinh nghiem ciia timg ngudi phan tich, nhung su sai khac
% dd khdng inh hudng nhiiu din kit qua.
Hgn che eua quy trinh n i ^ la chi ip dyng tot cho logi mlu chu yeu cd thanh phin li eit ho|c eat cd chiia it set. Cdn ddi vdi logi mlu nhiiu sft-miin, thudng khi^ Ipc qua dung djch njmg bromoform, phin sft-miin se dm bpc khoing vgt ning, can ttd khdng eho ling xudng dudi, do viy thudng sdt khoing vat ning trong phin nhp, nen phai lpc di Ipc lai nhiiu lan, tdn bromoform vi anh hudng nhit dinh din dp chinh xic ciia phuong phip phin tieh.
Mit khac, khi phan tieh dudi kinh dinh gii % khping vgt theo thi tich, nhimg khoing vgt chi cd vai hat hoic him lupng ft, rat it. s5 khdng dinh gii dupe % thi ghi vii hgt, ghi it (vii hat li tir! hat din it; it 14 tir 0,1 din 0,9%), nen ciing inh hudng nhit djnh din vifc tinh dinh lupng kit qua phin tieh.
a. QUY TRINH PHAN T(CH BINH LlTONG QUANG SA KHOANG VEN BIEN HEN NAY'
De khic phuc cic tinh trgng ndu tren, qua xem xft ket qua phan ttch tai cae phqng phin tich thi nghiem, Cyc Dia ehit vi Khoing sin VN da sua ddi va ban hanh Tieu chuin eo sd: TCCS-01:
2010/DCKS - Phuong phap trpng sa - Phan tieh dinh lugng cac khoing vit ilmenit, rutil, leucoxen, anatas, zircon va monazit ttong sa khoing ven biin (Quyit dinh sd 114QD/DCKS-DC ngay 8/3/2010 eua Cue trudng Cue DC&KS VN).
Ban ehit eua phuong phap li dimg biomofonn (CHBrj) cd ty trpng 2,85-2,9 di tich cac khoing vat nhe cd ty ttpng nhd hon 2,9; phan chia theo tir tinh phin ning cd ty trpng Idn hon va xic dinh eic khoang vit bing kinh hien vi soi noi; cin v i xac dinh dinh lupng ham lupng cic khoing vat ilmeniL rutil, leucoxen, anatas, zircon vi monazlL Phuong phap cd 3 cdng dogn: liy mau, phan logi mlu va phin tt'ch, dupe thi hien nhu so dd Hinh 1.
1. Lay miu
Mau ldi khoan, mau ttpng sa ty nhien cd trpng lupng khoing 8-16 kg (hoic 0,5- 1 kg ddi vdi mau ttpng sa) dupe phoi, siy khd, chi xit, lim loi, sau dd ttdn, chia bang miy di liy lupng mlu tir 1,5 din 2 kg. Tir diy, tiip tue ttdn, rdi gpn di liy may luu dja chat v i mau phan tieh th!
nghiem (moi phin 300-400 g).
Phin mlu phan tich tiip tyc dupe trdn diu, ray qua lay 1 mm di loai bd vd sd, 6c, que, la, phin chia nit gpn liy 30-60 g di phan logi vi phin deh. Tuy Ulupc dac diim mlu, si diiu chinh trpng lupng phin mlu phin logi cho phii hpp. Niu mlu cd dp hgt nhd, lupng sft nhiiu >20% se liy ttpng lupng tir 40 din 60
& neu mau cd dp hat trung binh, lupng sft it, lay ttpng lupng 3{>-40g.
SJCd LAY. PHAN LOAI MJ!U TRONG SA
-CMxatemk;!
1 Trfin (Mu, phSn che i^miu kniOCvdPTTN[1.S-3(gJ
3 Ti^ncrSu, pMnctiB iSymluPTTN (300-4009)
i.chaxa.MntiqiBfaylinm
•
5 Trfin^u,pli3nche lay mlu pMn Hch (30-509)TWlWsfil [ ~ ^
I
•
I10 Phin ntie can r 1 I . S*¥khS.li.^mlra ' '
diMUrih J I
-•
I
e Chaxa sdng qua tay Imm (nSu quf ng df ng cyc fin KV nghen tn«3c kfttsang)
S 5dykhA.c3nq2
9. LQC hnunotooc
10 Phdnn^ng sdy IM. cSn g3
/f^
11 Phin bribing namdtam TO d mleanq3-1)
L_
Bl^nlQ (can q3-l)
Hinh l.Sado liy viphin logi miu trgng sa.
2. Phin logi mlu
Phin mlu dua phan loai dupe xic djnh ttpng lupng bing can kJ thuit cd dp chinh xac 10 g, say dd nia ttpng nude di loai bd set Phin sft miin thii dupe siy khd vi kiem tta tten kinh hiin vi. can xac djnh 72
ttpng lupng de gpp vdi phin nh? sau khi lpc. Neu trong phin siu mim cdn lin khoing v^t nJng, phii tiip tyc dii di liy phan khoing vgt cdn sdL
Sau khi rua set, mlu dupe Ipc qua dung djch nJng bromoform di tieh phin
nang va phan nhe. Phan nang va phSn nhe sau Igc dugc sly kho, can trong lirong, rieng ph§n nhe duoc ki6m tra dtioi kinh dephat hien cac khoang vat nang con sot.
Neu CO khoang vat nang sol lai, ti6p tue I9C bromoform phfin nhe cho d&i khi khong con khoang vait nang iSn trong phin nhe.
PhSn nang dugc phan loai bSng nam cham chuyen dung, tach ra 3 phSn: tir cam, di6n tir, khong dien tir ngng, sau do xac dinh trpng lugiig timg phSn va dem phan tich dudri kinh hiin vi.
Timg phln khoang v^t nang: tur cfim, dien ttc, khong di?n tir, diroc ph&i tich duoi kinh hifin vi anh sang phfin xa co do ph6ng d?i 10-50 liin theo quy trinh phan tfch mau trgng sa tu nhien, bao g6m cac khau ca bfin:
a. Phfit hi?n, xfic dfnh cac khoang vat CO trong mau
b. Bfinh gia % cfic khofing v§t theo 1 trong 3 cfieh:
c. Chgn va can la phuong phap c6 dg chinh xac cao, nhimg mau ed kich thuoc hgt nh6, thao tfic cham, mfit nhi6u thoi gian khong dfim bfio tidn dg;
d. Chfin hfing d6m hiit lfi phuong phfip thao tac ch|m, mSt rfit nhifiu thai gian, dg chlnh xfic khong dugfc cao iSm;
e. Kfi hang, nhom dong (khom).
Kinh nghi?m phan tich nhieu nfim cho thay trong 3 each neu Iren thi cfieh "ke hfing, nhom d6ng" dfi xfic djnh % khoang vgt ti?n Igi hon, nhanh hon va chinh xfic han cfi. Bfing cfieh trgn dSu va diing manh nh\ra chia m§u thanh timg hang, dfii khofing 8-10 cm. Chgn 1 hfing dai dien, xfic djnh, nh&t cfic khofing vgt cfin phan tich trong hfing d6 thanh 1 nhom, chia phan con Igi ciia hfing dang phan tich ra cfic nhdm tuong ung vdi khoi lugmg eiia
nhom khoang vat can phan tich, TiJr do dfinh gia % tong khoang vfit nang eo ich theo tong s5 nhom da chia.
Vidu: trong 1 hang chgn dugrc t6ng cfic khofing vat titan Ifi 1 nhom, phfin con lai tuong ung CO 4 nhom (co kh6i lugfng th£
tich gap 4 ilin the tich t6ng khofing vat titan da chgn dugc), nhu vfiy ham lugng khofing vat titan se Ifi 20%.
Trong timg nhom khofing vat da lira chon tren, lai Ian lugt nhat ra tijmg khofing vat CO ich rieng bifit khac vfi danh gia % ciia khoang vgt do so voi nhom khoang vfit nay, tii do suy ra % khoang vfit cfin tim trong mfiu.
Cong thijrc tinh kh6i lugng (g) khofing
Q(s)=g, axd^
axda+A(\00-a) trong d6: a Ifi ham lugng ( % ) khoang vat; q3 lfi khoi lugng phfin mau co khofing vgt can tinh (g); do lfi ty trgng ciia cfic khofing vgt can phfin tich; 4 Ifi ty trgng khoang vgt edn Igi,
L^y: d timcniu zircon = 4 , 7 ; d ruiii = 3,9 . dieucoxcn = 4,0;anaias.brucil = 4 , 3 ; dmonazit = 5 , 1 ;
Cong thiie tinh hfim lugng {%) khofing vat:
C(%) = ^ X 100 trong do: C Ifi ham lugng % khofing v§t trong mau; Q, la khdi lugng khoang vfit; qi lfi khoi lugng dem phfin tfch.
Quy trinh phfin tich neu tren da giai quyfit dirge cac han chfi ciia cac quy trinh trudc dSif va phii hgp yfiu cau thuc tfi sfin xufit, nhfit la dam bao dg tin cfiy, chinh xfic. Cae khau de mfic sai sdt nhat trong qua trinh phfin loai, phan tich dS dugc khac ph^c, cu thfi:
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a. Cac khoing vat cd ieh trong qugng sa khoang ven bien cd dp hat nhd, phan bd rat ddng deu va viec phan chia, nit gpn tir mlu ban diu di liy 30-60 g mlu phan tieh dupe thyc hien bing miy ed sai sd giira cic phin < 2 %, nen dim bao tinh dai dien ciia mlu.
b. Qua ttinh nia, tach, loai bd sft dugc thuc hien trong mdi trudng kin, lugng sft- mim dupe kiem tia dudi kinh d i thu hdi khoang vat cd ich, nen khdng cd khoang vat quing bj thit IhoaL
c. Cdng tic xic dinh ttong lupng mlu thyc hipn bing can dien td cd dp chinh xic din 10"' g, ting dd tin cay cho kit qua phan tt'ch.
d. Vi?c dinh gia % khoang vgt dudi kinh dugc thuc hi?n eho it nhit 3-5 hing dgi difn va sai khac khdng ldn, nen kit qua phan tich dn dinh.
Thyc te vice kiem tra chit lugng phin tich bing hinh thuc kiim tra cMo giSa cie Phdng phan tich thupc cic Lien doan ttong Cyc DC&KS VN diy cho kit qui on djnh, sai so nhd va nim ttong gidi hgn cho phdp. Kit qui kiim tta ngogi do Phdng Thi nghiem Tdng cdng ty Khoing sin v i Thuong mgi H i TTnh thyc hi^n cOng dgt ket qui tit, sai sd nhd, nim ttong gidi hgn cho phdp.
Do vjy, vipc phan Uch mau ttong sa ntin thii ddng theo quy ttinh neu tt6n se dim bio dp chinh xic eda kit qui phan Uch v i urong duong phuong phip phan Uch djnh lupng logi 111.
u, JiJfSL?** ^ ''^ THirflrUG GAP ANH
HUHJNG O&l CHAT LWTNG P H A N TiCH
J r o n g qui ttinh phan loai, phJn tich mau trpng sa theo quy ttinh neu uen ed mpt sd yeu Id Uiudng gay sai sd nhu sau:
1. Khi ngam nia, dii, mlu lugng set- miln cao, hgt mjn, niu khdng ehu f khi ling ggn, qyjng s8 ttdi theo set ra ngoai lim mat qu|[ng.
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2. Khi lpc, chu ^ kiim tta c&: lpc aa khd ehua, chat luprng bromoform phii dam bao dp tinh khiit v i ty ttpng phii dgt 2,89-2,9, thi khi lpc quing mdi khdng bj sdt xudng phin nhp, mlu mang lpc phii ghi dung sd hidu diing cdc lpc, phii xip ttieo thd ty td nhd din Idii tranh nhim lin gay sai sd thd (khau niy lit de nhim lan).
3. Tnrdc khi can phii kiim Ua dp chinh xac eda ein, chuin Igi can ve sd khdng, sau mdi Ian cin phii kiim Ua Igi cin.
4. Trong qui trinh phan tich, vipe xic dinh chinh xac khoing vat rit quan ttpng ttong vi^c danh gii % khoing v§t, ddi hoi ngudi phan tich phii cin thin, chinh xic, di nhin biit khoing vgt.
5. KMu ttdn v i ke hing ciing ddi hdi phii hit sue cin Uiin, tt§n di tt^n Igi nhiiu lan, ke hang phii thing v i diu, nhdm dong cung phai diu, khdng dupe ddng to ddng .nhd, dan din khi tmh % se cd sai so ding ki.
V. M(JT S6 BlgN P H A P N A N G CAO CHAT LUtpiNG GIA C 6 N G , P H A N TfCH MAU
1. Rira ak logi bd s « , mim, bat... ddl vdi mlu nhigu sit
Cac mlu ttpng sa, 18i khoan ty nhien vimg ven bien Thanh Hoi, Nghp An thudng ed him lugng sit, mdn, bdt kha eao. Id 10 den 40%, dd hgt sa khoing rat nhd (chu yiu
<0,5 mm), die biet mlu sa khoang vimg Ninh Thu^, Btah Thuin va Bic Bi Rja - VOng Tiu ed lupng sit nhiiu, chiem 10- 65%, ddi noi mlu gin kit khi chSt, nSn vi^c gia cdng, tich khoang vgt ning gip nhiiu khd khin. Ddi vdi mlu loai niy, ttudc khi nia, tich, logi bd mun-sft can ngim mlu trong iiudc tir 1 din 6 gid v i diing tay hoic i*iy gd ehi xit nhf d i giii phdng sft ra khdi khoing v^t quJing. Trong khi nia, phii tich dugc mOm-sft, cit nh? lo liing v i phin ning thinh cic bd khic nhau, sau dd logi bd phin mta-sft, cit nhp to lung >^ qui Utah niy thudng phii tien hanh nhiiu lin (3-4 lin) Ttpng lugng mju sau khi dii phy tha^c
:ds j
ihii j dgt I
thanh p ^ miu ban diu, thuong cdo 20-30
^ cd mlu eU edn 10-15 g. Niu nia nhiiu lin, m i l edn lai se sach, diuin Ipi eho qua ttilA lpc bromoform, nhfing di gay ra Men tupng fliit dioat khoang vat cd ieh theo be cat nhe to Idng cdn niu nia it lin, mlu khdng bi ndi khoang vat qugng, nhung via:
lpc biomofonn se g ^ khd khan va cdng cd nguy CO gay mit khoing vat quing.
Z Kiim tra khoang v i t nang S45t trong eac phin nhe
Chit lupng cdng tic gia edng ed vai tro quan trgng, quyit djnh chit lugng phin tieh, Irong dd viec kiim tta khoang vat ning edn sdt trong phin nhe la yiu td co ban quyet dinh chit lugng gia cdng.
Cie phin set-mun tach ra ttong khau (Bi so dugc kiim tta dudi kfnh hiin vi, neu sdt khoing vgt nang phii tiip tyc dai Igi di liy khoang vit n#ng, niy khdng sdt mdi dua mlu di lpc bromoform.
Phin khoang vat nhe tach ra ttong khiu lpc biomofonn ciing dupe kiim tra dutii kinh hien vi, niu lan khoing vat cd ich nang phii lpc lai phin nhe (M, neu Ididng lin mdi dua mlu di phin logi bing nam cham.
T\ 1^ kiem tra khoanjg vat ning sdt trong cic phin nh? la 100% sd m i l ^ a cdng.
3. Ning cao chit lupng cdng tac can Trong quy trinh phan logi, phai sir dung can kha nhieu lin di xac dinh ttpng lugng nhitag phin mau cd ttpng lugng nhd, do v|y dl gip nhiiu sai sot D i khic phuc phai thudng xuydn kiem tta dp chinh xac cua eac logi can, su dung can cd dp chinh xac phu hpp di xic djnh ttgng lugng timg phin mlu vi die bi?t duy tti vide ein kiim tta 10- 15% sd mlu gia cdng, phan bd diu cho timg nguili gia cdng.
Cin kiem tra bing cin dipn ui cd dp chinh xic l o ' g phai do Tnrdng phdng Thi n g h i ^ hojc cin bp kiim tta thyc hi?n vi tiai hinh thudng xuyen cho timg Id mlu gia cdng. Niu cd sai sd 3-5%, phai
tang ty le kiem tta v i yeu d u ngudi gia cdng chu y khi can; neu sai sd >5% va c h i ^ bon 10% mlu kiem tra phai can Igi loan bd Id mlu ngudi dd gia cdng v i liy kit qua can kiim tra thay thi kit qua cin ban ^ i L Trong trudng hgp sai so >5% bit gap nhieu lin tip trung vao mdt ngudi, khdng bd tri ngudi dd gia cdng mlu niia.
4. Thirc hien tat tit ca cac khau tnmg qua tTBih Epa cdng va phan tKh m l u
De nang cao chit lugng edng tac mlu, phai ehu y thuc hien tdt tit ca cae khau ttong qua trinh phin logi v i phan Uch mlu, tir khau ehuin bj mlu, phan logi, phan Uch va vio kit qua. BSi cgnh dd, ehu y thuc Men tdt edng tic kiim tta npi phdng du ngMem, kiemtra ndi, ngoai dia chit Uieo ty le quy dinh, ein thuc Mpi tdt cdng tic quan Iy boat ddng phan Uch mlu bing su kiim tra chat che ciia cac cip quin ly.
VI Kft-LUAN
Quin^ ntan-ziicon sa khoing ven biin cd thanh pMn khoing vat ed fch phan bd Uong cat, bpt, sft vdi dp hgt va ham lugng rat khac nhau. Vi?c ip dung phuong phip phin Uch djnh hipng theo Tieu chuin co sd TCCS 01:2010 do Cue Dia chit N-i Khoing sin VN ban hinh dam bao dinh gia chinh xie him lugng khoing vgt quing. Tuy nMdn, nong qua trinh phan Uch can chii y phit Men va xu ly kip thdi cac sai sdt di ning cao hon niia chit lugng phan Uch
VAN LIEU
1. hi Vin Dat, 2008. Bao cio Dieu tra. danh gia trien vpng sa khoang ven biin Ur Thanh Hoi din Thia Thien-Hui".
Luu tri Dia chit. Hi Ngi.
2. Nguyen Van Thuan, Tran Van Thao, 2008. Tiim nang sa khoang titan- zircon cdiig ngUep Uong ting cit dd thupc he ting Phan Thiit d dii ven biin Nam Tnmg Bp. TC Dia chit. A/308 • 18- 24. Hi Ngi.
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