Nhu m\)c dich, yell diu cua lu~n an d~Hra la nghien CUllh~ giam dQbie'n dQng va gidi h~n phat hi~n yang va platin b~ng trong m§u dia chill b~ng ky thu~t phan tich quang phd nguyen tii' , chung toi da t~p trung nghien CUllcac viln d~ v~ s\)'khong dn dinh cua cac ke't qua phan tich yang trong th\)'c te', sii' d\)ng chufin thO'ngke d~ tinh cac phuong sai, tu d6 ap d\)ng ky thu~t phan tich vdi luQng can IOnd~ h~ thilp dQbie'n dQng, cac khao sat th\)'cnghi~m v~ phan tich h~t kim trong 10 graphit d~ phan tich yang (j co ham luQng ppt, khiio sat them tinh chill bO'choi phan do~n d~ phan tich Pt tren cung mQt day chuy~n phan tich tren 10 graphit va nghien CUllap d\)ng qui trinh phan tich yang va platin trong hai cong do~n: lam giau b~ng cach Dung chiiy m§u vdi chill g6p, dung phd phat x~ d~ phat hi~n cac nguyen to'(j gidi h~n 10 ppb. Qua tO~lllbQcac ke't qua duQCtrlnh bay tren, v~ m~t th\)'cnghi~m, lu~n an da d~t duQc mQt sO'ke'tqua mdi sau day:
I) Qui trlnh phan tich yang tren duQc bift d'au tu luQng can phan tich kha lOn,qua qua trlnh lam giau b~ng Dung chay va copen d~ cuO'icung duQc phan tich trong 10 graphit cua thie't bi hilp th\) nguyen tii'r6 rang dap li'ngduQc d"Ongthai cac yell c'au: dQd~i di~n phiii cao giup ke't qua phan tich dn dinh; gidi h~n phat hi~n c\)'c
nh~y giup nghien CUlldia bOa yang d~t hi~u qua. f)~c bi~t cac
nhi~m nhi~u quang phd hay h6a hQc d~u duQc lo~i tru rilt nhi~u, do thanh ph'an h~t kim rilt d"Ongnhilt va cac nguyen to' thuang gay
nhi~uda duQclo~itru trongcac cong do~nlam giau(j tren. Cac ke't
lu~n nay duQc kh~ng dinh qua phan tich th\)'c nghi~m cac nguyen v~t li~u va thanh phfim sau qua trlnh lam giau.
2) Qui trlnh c6 th~ m(j rQng ap d\)ng d~ phan tich rieng Ie them cac nguyen to' qui khac c6 trong h~t kim nhu Pt, Pd b~ng cac chuang trlnh nhi~t tuong li'ng. Cac tinh chill v~ dQ dn dinh, dQ d~i di~n va gidi h~n phat hi~n khi phan tich cac nguyen to' nay cung duQc Dang cao nhu trong phan tich Yang.
Luqn an tom tlit
3) BAng su' dQng tinh chili b6c hdi phan do'.ln giua cac nguyen t6 co th~ tie'p tQc phiin tich Pt teen cung mQt day chuy'en phiin tich vdi cung co gidi h'.ln phat hi~n. Day la mQt u'u di~m cua phu'dng phap. TMt v~y, qua trlnh lam giau bAng cac cong do'.ln
teen rii't t6n cong, ngu'Cfiphan tich co th~ phan tich du'<;1ccii 2 kim
lo'.liqui Au va Pt vdi dQ nh'.lYcao la mQt ghli phap rii't kinh te'. Ly
thuye't v'e b6c hdi phiin do'.ln,mQt tinh chii't du'<;1cap dQng rii't nhi'eu
trong quang ph6 phat X'.lnguyen tU'h'Oquang, cling dii du'<;1clam ro
qua thlfc nghi~m (j ph'an 3.9.
4) MQtnghien cUuap dQng mdi cling du'<;1cthlfc hi~n, do la
phiin tich nhanh loan bQvang, platin va cac nguyen t6 nhom platin bAng quang ph6 phat X'.lnguyen tU'.Phu'dng phap quang ph6 phat
X'.lnguyen tU' thu'an tuy thu'CfngkhOng th~ xac dinh du'<;1ctrlfc tie'p
cac nguyen t6 nay trong cac m~u tlf nhien, do cac nguyen t6 nay co
ham 1u'<;1ngthii'pva rii'tphan tan. Vi~c lam giau du'a m~u v'e h'.ltkim
rii't thich h<;1pcho phiin tich quang ph6 phat X'.l.Di~n clfc than chua
vua vi;inh'.ltkim va nhi~m nhi~u quang ph6 h'au nhu' du'<;1ctri~t lieu,
gidi h'.lnphat hi~n t6t hdn 1000 l'an.
5) Lu~n an cling dii ap dQng phiin tich co hi~u qua tren mN s6 m~u dia chii't ma trong thlfc te' vdi cac phu'dng phap phan tich
thOng thu'Cfng,vang va platin khong th~ nao du'<;1cphat hi~n. Cac
lo'.lt m~u ky hi~u Ktng va LN du'<;1cphiin tich (j nhi'eu phong thi
nghi~m, ke't qua la du'di gidi h'.ln phat hi~n. Ro rang vdi ke't qua nhu' v~y cong lac nghien CUuvang gi;ipkho khan vi nha dia chii't khong co cd sd d~ lu~n giai di'eu gi. Ke't qua phan tich vang vdi
gidi h'.ln phat hi~n t6t ma lu~n an dii d'.lt du'<;1cgiup co th~ ly giai
du'<;1cm6i lien quaD giua cac nguyen t6 trong mQt vung thlfc dia.
Cac lo'.ltm~u TMTP cling du'<;1cphat hi~n co chua Pt la mQt kh~ng
dinh khoa hQcminh chung cho ynghla thlfc ti~n cua phu'dng phap
cAc CONG TRINH LIEN QUAN DEN N(n DUNG LU~ AN DA cONG BO
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sinh l11nthl1 nha't, tr 158-161, (2000)
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nghi V~t ly loan qu6c l11nthl1V-Ha nQi, (2001)
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De-n,PMn rich vang sieuvi luqng Mng phurYngphdp hap thl!-nguyen
tit sit dl!-ng10graphite,Dia cha'tTai nguyen Moi truong Nam Vi~t
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Nguy~n Van Dinh, Ung dl!-ng quang ph6 phdt X(l nguyen tit di pMn
tich nguyen to'trong vat eMf, Chuyen d'e nghien cUu sinh, (2002)
Nguy~n Van Dinh, Duong Ai Phuong, Nguy~n Van De-n, PMn rich
vir trong bauxite Mng phu(/flg phdp quang ph6 phdt X(l, T'!-p chi PhM
tri~n Khoa hQCva Cong ngh~, T~p 5, tr 94-99, (2002)
Duong Ai Phuong, Nguy~n Van Dinh, Nghien cllu pMn rich cae
nguyen to' nhOm platin Mng quang ph6 phdt X(l kef hqp wYi phurYng
phdpnung chay, D'e tai ca'p bQ , (2003)
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Nguyen Van Dinh, Duong Ai Phuong, Nguyen Van Den, Analysis of super micro-content of gold by AAS using graphite burner, The third