Xác định lượng vết asen bằng phương pháp điện hoá hoà tan

mo 'ujG KI KIEU VA GbU T X T trg MO ±;AU TO]^"G ^LAl^' TAI LISU / Sd li:Ldc c a c pbifdng p b a p x a c dinbi lu'dng v e t e s e n / T i n b c h a t d i e n hoa cua a s e n / Cac phu'dng p b a p 12 d i e n boa boa t a n x a c d i n h asen - Pbitdng p b a p d i e n boa b o a t a n a n o t 1? ^ - Pbufdng p b a p d i e n hoa boa t a n c a t o t 19 / Cac van de n g b i e n ciiu t r o n g l u a n an ' 20 3-0 / GAG PHtfdNG PHAP I^IGHIEK CUb \fl i^lJu 'ixl^l:^ TIiUG JNGlxlSk Cac phu'dng p b a p d i n b bijfdng n g b i e n cu'u - C l - Phu'dng p b a p cu'c pbo 23 - Phiidng p b a p von-ampe vong 25 3-i / Cae p h u d n g p b a p d i e n boa boa tan - Ban c h a t pb\j:dng p b a p ' 26 - Nb5ng v a n de l i e n quan d e n g i a i t t o a n lam g i a u 28 - - ATn-Sng v a n de l i e n q u a n clen g i a i d o a n b o a t a n 31 / Dieu k i e n tbirc nghiem 3.2.1 - May.thiet bi • ' • 36 3.2.2 - Dien ciic 36 3-2.3 - Hoa chat va dung dieb 38 3.2.4 - Ky tbuat ghi ^0 3.2.5 - l^ay mau va ehuan bi ^1 3.2.6 - Xi ly so lieu tbrfc ngbiem 41 4.0 / iOi^T 'CQD^ VA bAiM LlJAl'i Cac d i e n cite so s a n b - iJien cifc e a l o m e n va b a e e k o r u a • • - B i e n ci:fc c b i s u n f a t * ^ 5^ 4.0.3 - Pbam vi sxl dung cac dien cue so sanb 57 4.1 / Tinb chat dien boa cua asen 59 4.2 /Xac dinh asen bSng pbu:dng pbap dien boa boa tan anot 4.2.1 - Cac tin bieu boa tan anot cua dong 4.2.2 - Hoa tan anot he Cu-As 67 72 4.2.3 - Hoa tan anot be Cu-Au 73 4.2.4 - Hoa tan anot be Cu-As-Au 75 4.2.5 - £'ieu kien xac dinb asen tbeo be Gu-As-Au bS.ng pbtfdng pbap dien the tbdi gian hoa tan anot 76 4.3 / Xac dinb asen bang pbifdng pbap dien hoa boa tan catot 4.3.1 - Xac dinb asen tbeo he Gu-As bSng pb^idng pbap von-ampe boa tan catot 81 4.3.2 - Xac dinh asen tbeo be I-Gu-As bSng pb\:fdng pbap von-ampe boa tan catot , dung dien ciic tbuy ngan tinb 4.3.3 - Xac dinb asen theo he I-Cu-As 85 bling phudng pbap dien the tbdi gian boa tan catot , dung ci/e mang t b u y n g a n dien 95 4.4 / Xac dinb asen bSng pbi:fdng pbap von-ampe boa tan xoay cbieu boa tan bae bai 100 4.5 / So sanb cac pbiidng pbap di ngbien cu'u Ban ve cd ebe 101 AP DbNG THUG T^ 5.1 / Xac dinb triic tien luldng vet asen cac mau tbT^c te 110 5.1.1 - Pban tich boa chat tinh kbiet 113 5-1.2 - Pban tieb nufde 115 5.1.3 - Pban tieb cac doi tu:dng sinb b9e 116 5.2 / Xac dinb bam l-\X6nQ: asen sau cat dudi dang AsH^ idlT LUAN 119 120 TAI LiSb THAIV —0 1984 ivb.AO 123 E.T HI^U VA CHU^ TAT : dien tieb dien cUc • ^As ' ^Cu • - , CTT : nong i o n e s e n xig , dong , t b u y n g a n t r o n g dung d i c h nong dang oxi boa dung dicb 'Ox nong kim loai tbuy nga n D h| so khueeh tan cua dang oxi hoa dung dicb he so kbuecb tan cua kim loai tbuy ngan ©THT dien the tbdi gian boa tan ( phudng pbap ) E the dieu ci;c ; bien gidi tin cay E^ the oxi boa kbit tieu ehuan ^1/2 the ti2& song cua song cu:c pbo ;' the itng vdi nUa tbdi gian cbuyen Ed the dien pban E the dinh Epa ' , Epk , E the dinh anot va catot • ' • bien gidi tin cay bieu dien tbeo 6.6n vi tijfdng doi tbuy ngan ; dien ciic tbuy ngan tinb ( dang tree ) HgTT dien ci/c mang tbuy ngan tren dia than tbuy tinb I dong boa tan pbiidng pbap ±)THT i ik dong boa tan anot va catot phu^dng pbap BTHT a ' P Kb dang khu' cua chat boat don^: dien Ox dang oxi boa cua chat boat dong dien Q dien lu'dng , tij:dng ditdng vdi ludng kim loai da bi dong dinb ket tua tren dien ciic s ; nbay ve dong dien cua may ghi SCE : dien eiic ealomen bao boa ( dung dicb KCl ) SPbE : dien cu'c cbi sunfat T : nbiet dung dicb : dien cu'c than mem Tm a TT : dien ciic dia than tbuy tinh VAHT : von-am.pe boa tan ( pbitdng pbap ) ( quay ) T : dong dien trung binh pb;:rdng pbap cu'c phS i^ : dong kbuecb tan gidi ban trung binh : bing so toe cua pban u'ng dien hoa d dien the tieu ehuan : cbieu day cua mang tbuy ngan * m : toe ehay cua tbuy ngan mao quan cua dien eiie giot tbuy ngan n so electron tham gia phan ling d dien cu:e ; so Ian tbi nghiem doc lap r ban kinh gi9t tbuy ngan s \ sal giay so binh pbiidng trung binh bay lech ehuan sv • : so vdi t : tbdi gian t^ ; cbu ky giot tbuy ngan : tbdi gian dien pban V : toe quet the X : gia tri trung binii cong cua n Ian thi ngbiem : he so cbuyen cua phan u'ng dien cue cT : cbieu day Idp kbuecb tan Z : tbdi gian cbuyen pp^ ppm 1.10'^ % 1.10 -4 ol nm 1.1C~^ m ng l.lC •9 1.10 (Jig = •o - J Md BAU ^ n g ed the dong vat va thuc vat c6 asen Vdi lUdng rat nbo , asen c6 tac dung kieb tbieb qua trirJri song NbUng neu vUdt qua mot gdi ban nao , no trd tharih chat doc HgUdi bi ngo doe asen kinh nien se roi loan bo may tieu hoa , cac niem mac bi hoai va eo the tu: vong -Asen ehiem -10 a • i khoi • lUdng vo qua dat , cbu yeu ton tai dUdi dang sunTua nbu: reanga ( As^S ) , oepimen ( As^S^ ) va mim Ian Ion vdi quang kim loai kbae Khi Ifehai tbac qu|ng , pbai cbu y den asen Asen dude sU dung y hoc ,^tbuoe da , san xuat tbuy tinln , v vat lieu ban dan v.v Trong nong ngbiep , dan xuat cua asen lam thuoe trU sau cbo cay Trong boa hoc pban tich , asen la thanb pban quan cua nhieu tbuoc tbu; huu ed quy nbu : asenazo , berilon IV , sunfaxazen , thoron I v.v San ludng asen cua the gidi tu bin nSm 1940 la 46.000 T / 57 /• Asen va cae ebe pbam cua no d^^X^c san xuat hang nam' , bSng nbieu dUdng kbae nbau , bi thai dan song , ho , bien Xac dinb ludng vet cac nguyen to , c6 asen , la mot nbung van de tbdi sU cua boa hoe pban tich nude ta nb§m phuc vu nbieu cbUdng trinh phat trien kinh te , kboa hoc ky tbuat va bao ve moi trudng Be laioi viec , ehung ta thudng dung pbUdng pbap tr§c quang , pban tich quang pbo pbat xa I^oSc hap tbu nguyen tu! Phudng pbap dien boa boa tan da bat dau phat buy tac dung d mot so phong thi nghiem , nbung nhin ehung , no chUa dii6c bien rong rai Tren the gidi , dien boa boa tan da tr5 tbanlj mot phudng pbap pban tieb vet quan trong khoang diem CO noi the bat so cua sanb phudng d\l6o pbap vdi nsj la nbay 20 n^m tfu nbay cua rat cao ^ pbudn^ pbUdng pbap kieb boat ndtron / 3914,35^^,55 / ina trang bi va ky tbuat lam viec lai kha ddn gian I'o eo the tbUe bien ca tren cac m.ay cue pbo thong tl!iudng da eo tai nbieu pbong tbi ngbiem thuoe cac bo Bing phudng pbap dien hoa boa tan , ngudi ta da xac dinh dude nbieu nguyen to nbieu doi tUdng f 3»14,53 • Tuy nbien nguyen to , eo asen , viec xac dinh mot so , can pbai ngbien euu Jhem Hien , viec xac dinb asen thUdng dude tbue bien bllng pbUdng pbap tr4c quang dung bae-diaylditbioeacbamat / 1,18, 44, 47 - Bo la pbUdng pbap tieu ehuan cua nbieu nude va nbieu tS chuc quoc te / 18,24,25,47 / Bo nbay -5-10"''^mo 1/1 TbUc te ngbien cUu va Ung dung nUde mUdi nSm qua ehung to la , b^ng phudng pbap dien boa boa tan , cbu yeu la von-ampe boa tan , ehung ta da xac dinb dude nbieu nguyen to d vung nong kbae 10"- lC"\ol/l , tru asen va vai nguyen Neu ngbien euu thanb cong mot phudng pbap xac to dinh asen c6 nbay , ebon loc vao ed nbu cac phudng pbap xac dinb Gu,Pb,Cd,Zn ( cac nguyen to sd trudng cua dien boa boa tan ) thi ta de dang tboa man nbieu nbu eau thue te cua dat nudc , c6 nbu eau cua cong tac bao ve^moi trudng 3di vay , ehung toi ebon de tai ngbien eUu la : Xac dinb lUdng vet asen bSng cae pbUdng pbap dien boa boa tan Asen c6 kboi ludng nguyen tu la tbu tu 74,92 d.v.6 , mang.so : 33 bang tuan bo^n Mendeleep m V A , cbu ky , n5.m gilia Ge va trung gian giua a kim va kim loai thuoe nb6m oe Asen eo tinh chat l^-'o c6 nhieu tinh chat dien boa d^c biet , pban ung dien cue kbong tbuan nghich Do .' \ , viec xac dinb asen bSng phudng pbap dien boa boa tan kbong giong nhu viec xac dinb Cu,Pb,Gd,Zn Sau khao sat nhieu he , dSe biet la eac be bae ba CU-AS-AU va I-Gu-As, a ' a a a a ' ehung toi ebon mot pbUdng pbap xac dinh ludng vet asen dap ung dude cac yeu eau da neu a I^o da dude dung de xac dinh ham ludng asen mot so mau tbue te Trong qua trinb ngbien cUu , ehung toi phat bien mot so van de eo y nghia cbung linh vUe pban tich dien boa boa tan 00 - T6i^ G ^b M TAI LI^U 2.0 / 2£l_l2£^lL-gA^ ^^^^^^ ^^^^ ^^^ ^^^-^ l^ Ag -s- (G2,:H^)^NGSSH ^ (G2H^)^NGSS 7^As Kbi AsH-z trUde vao dung dich hap fhu dude dan qua Idp giay ( bo§c bong ) tam cbi axetat de lam sach vet H^S Gudng mau cua dung dicb hap tbu ty le vdi nong asen Bo nbay -5.10"'^ mol/1 - Bung dicb thuoe tbu eo mui h^e va rat doc - No de bi pban buy dudi tac dung cua anb sang va nbiet do,gay kbo khan cbo viec bao quan Co tbf xac dinb asen bSng pbUdg_pbap so mau vet tren giay 7 • ^ ^ay ^ asen dude khU bing kem kim loai moi trudng axit thanb asin Khi di qua giay tam axetat de lam sacb vet H^S roi den giay tarn HgBr^ cbi boae HgCl^ Ham ludng asen dUdc danb gia qua viec stb sanb cudng mau cua giay tam muoi tbuy ngan Ung vdi mau phan tich va mau doi cbieu - Cong viec lam bing m§t thudng , sai so cbu quan Idn Koch 0- G £ ^^ J kbong xep pbUdng pbap vao hang cac pbUdng pbap dirib ludng asen Tuy theo ludng asen bi hap tbu tren giay , cae hdp chat c6 mau kbae nbau se d^i6Q tao thanb [ \ '- H(HgBr)^As - mau vang , (HgBr)-,;As • mau nau , Hg^As^ - mau d^ii Hien cac pbong tbi nghiem nude sU dung bai loai tbiet bi Gbung kbae nbau cbu yeu d each d|t giay tam muoi tbuy ngan PbUdng pbap kbong du nbay de xac dinh asen toe va mau vi bam ludng asen cae doi titdng qua nbo va ludng mau can pban tieb qua Idn , kbong eo dieu kien cung cap Kbi pban tieb nude , pbai dung bang lit va qua giai doan boc bdi rat au Ket qua xac dinh bam lUdng asen Bang / He I-Cu-As ; pbUdng pbap VAHT So : Van ; ITude : VH.362 : NUdc may bien CH.2762 : ITudc Ho Oudm HK.2872 : Nude Ho Tay HjPO^ : H^O^ T.2872 ( p L i e n xo ) ( e x p Nbat : T h i t hop Toe : H'lau : ^i TB.62 T.18113 M.23113 2,40 2,76 3,03 '• , 3,^1 3,84 0,51 0,64 0,7^ • 0,75 0,81 0,9^ 2,50 ^,75 ^,90 3,05 3,25 3,62 13,0 14,2 L^,5 : 16,0 l7il 17,5 6,55 7,53 8,00 8,23 8,84 10,2 z 0,001 ) (Ug/l nt' nt: nt; ppm nt; 0,15 0,18 0,20 0,22 0,^3 0,26 0,90 0,78 0,7J 0,68 0,63 0,55 0,0X6 , , nt: nt; nt: 0,022 0,024 0,030 10 Nudc t i e u T.9123 : 0,096 0,087 0,083 nt; 0,078 0,071 0,063 11 : P b i l a t o p P.10123 : 0,04^ 0,037 0,031 0,038 0,024 0,018 nt: 118 B.4 mot so mau catot Bi|n cue tbuy ngan tlnb vi SCE / s : E : X : 3,1 fg/1 : 0,25 0,73 • nt : • E :'rtac quang i 0,53 (Ug/l : 17% 2,6 (ug/1 : 0,022 ; 0,15 nt ' 21 i o;i6 ': 0,41 nt 14 2,7 : ; 1,9 nt 12 17,0 nt 3,0 nt 15,4 nt 8,2 ppm i 1,5 0,21 nt : 0,0015 0,71 nt 0,015 0,021 nt 0^,080 nt ' 0,030 nt : 0,000076 ^'^ 0,000046 0,00014 : ,1,3 ppm ' nt 16?^ 9,0 ppm ': 0,041 nt 20 , 0,18 nt 0,13 nt 18 - 0,007 nt : 35 - ; 0,012 nt 0,009 nt • 15 30 0,075 nt - 119 5-2 / Xae dinh bam ludng asen sau cat dudi dang_AsII^ / 68 '^ Ham ludng asen cac mau phUc tap ( "qu^ng ) dUde xae dinb sau kbi cat dudi dang AsH-^ Cat asen miy cat tbuy tinb , bap tbu AsH^ bing 10 ml dung dicb PainO^ 1% da axit boa bing vai giot E^SO^IO % Ludi^kem dung de kbu li g , tbdi gian cat la gid Sau kbi cat xong , khu KBinO^ du bing bidrazinsuniat Sau lay mot pban dung dicb dem xae dinh nong asen pbap dien boa boa tan nbu da neu d mue trude Tbi ngbiemi ebo tbay , mau tring ehUa asen ( toin bing pbUdng 0,2 - 0,3 (ug bo dung dicb bap tbu ) Nbung tbi ngbiem A tiep tbeo cbo biet , ludng asen mau tr^ng la dUa vio Kem co him ludng asen dudi 1.10 kem % dudc coi la kem khong asen Ket qua phan tieb cbo tbay , ham ludng asen la 0,07 ppm Nbu vay , g '^^em da dung kem da dung de kbu CO the chUa tdi 0,35 PS asen Gia tri niy phu bdp vdi ludng asen tim tbay mau trSng Ebi ngbiem cbo thay , vdi lUdng asen (III) khoang ~ 50 (Ug , bieu suat cat kbong dUdi 90 '•- Ba tbu pban tich vii mau pyrit Ket qua phu hdp vdi phudng pbap trSic quang Xet cbo cung , neu pbai qua giai doan taeb asen bing c each cat dUdi dang AsH^ , tbi ve m|t nbay ( ludng asen mau tring khong che ) dien boa boa tan vi tbdi gian , phudng pbap kbong hdn phudng pbap trac quang , Kbi do, phudng pbap dien boa chi hdn phudng pbap trSc quang mi.ot diem la : kbong eo mui boi cua pyridin 126 b A J^VIJT /^ Lb^N Trong ban luan in niy , cbung toi da dat dUde cae ket qua sau day ; ) Ba ngbien ciTa mot each be tbonfe di tbiet lap cac dieu kien tbieb bdp ebo viec xae dinb asen bing phUdng pbip dien hoa boa tan anot tbeo be Cu-As-Au Noi dung cua phudng pbap la : ban dau ket tua asen bing dien pban kbi co m§t Cu(II) va Au(III) d nong tbich bdp , sau boa tan ket tua ay bSng pban cue anot dong tbdi ghi tin bieu pban tich theo ky tbuat dien the tbdi gian boSe von-ampe Ba bat dau bang viec ngbien eUu ed ban tinh chat dien boa cua eac be : Cu , Cu-As , Cu-Au ya Cu-As-Au de xae dinh kha nang boa tan anot cua cbung Cuoi cung , tim dudc dieu kien tbieb bdn de dinb ludn^ vung nong 2.10 asen ~ 3-10 ^ mol/1 bing phUdng pbap dien the tbdi gian hoa tan anot dUa vio sU nbu tbuoc ty le tbuan giua tbdi gian boa tan ket tua ( tbdi gian cbuyen ) va nong asen (III) 2) Tu viec nsbien eUu tinb chat dien boa cua he Gu-As tren A dien cue tbuy ngan tinb , da tien tdi xay dung dude phudng pbap dinb ludng asen ky tbuat von-ampe •? ^ d vung nong 10 '^ - 10 mol/1 bing boa tan catot dUa tren sU phu tbuoc giUa dong dinb catot vi nong asen (III) ) Ba ngbien eUu cai tien phudng pbap xac dinb asen tbeo he I-Gu-As kbi dung dien cue tbuy ngan tiiih cua cac tic gia trude Ba rut dieu kien tbieb bdp cbo yiec xae dinb asen bing ky tbuat von-ampe boa tan catot boae dien the tbdi gian boa tan catot Ket qua cai tien cbo pbep tien binh tbi ngbiem d dieu kien de ding bdn : nbiet vi nong axit 121 thap bdn , dung dong mot cbieu tbay cbo dong xoay cbieu va nang dude nbay xae dinb 10 len cao bdn phudng pbip cu khoang Ian ( phit bien dudc asen d nong 5.10~" mol/1 ) Ba xem xet kha n^ng dung dien cue ming tbuy ngan than thuy tinb tren dia tbeo be noi tren Ba tim dudc dieu kien tbich bdp xac dinb asen d vung nong 10~^ ^ 10"'^ mol/1 bing phudng pbip dien the tbdi gian boa tan catot ) Be tien hanh dudc cac thi ngbiem , cbung toi da ngbien euu cong phu nbim boan tbien tbiet bi vi de xuat ky tbuat mdi bUu bieu : cai tien dien cue so sanb cu , ebe tao dien eUc ebi sunfat lim dien eUc so sanh mdi , che tao dien cue than mem , cai tien hs thong tiep xue cua dien cue dia than tbuy tinb quay , cai tien lip mach cho phu'dng pbap dien the tbdi gian , de ky tbuat-quet the dung de loai tru can trd cua Cu(I) ) Ba giai tbieb cd che cua eac phan ung dien boa lam cd sd cbo eac phudng pbap pban tich mia cot loi la su binb tbinb cac bdD chat gian kim loai eo boat tinb dien boa manb va kha nSng hap phu co Idi cua cac phUe chat eo I~ eau noi ) Ba be ap dung pbUdng pbap von-ampe boa tan catot sU dung I-Cu-As de xac dinbi true tiep him lUdng asen mot so doi tudng it pbuc tap eac mau sinh hoe nbu : boa chat tinb kbiet , nude , Ket qua phan tich bS.ng phudng pbap niy phu hdp vdi ket qua pban tich bing pbUdng pbap trac quang dung bae dietylditbiocaebamat Uu diem_ n^i bat cua pbUdng pbap dien boa boa tan the hien d tinb ddn gian ve thao tic tbUe hien , tbdi gian pban tich nbanh , khoi Ixt^n^ mau dung de phan tich it va tbiet bi pbo bien , re 122 Kbi pban tich cae mau pbuc tap ( quSng ) , can pbai tieb asen I trUde dUdi dan-:^ Ash o o- 123 TAI L I S U A TilAlVi Ktilo Cbvi' y^a EAEKO A.K., nffilHUEHKO A.T ^OTOMGTpinecKiift anajiHs MGTO^IH onpeflejieHHH HeMGTajuiOB XHMH3flaT , M , 135 (1974) EEJIOBA T.fl , EEPEHTPA."^ H.E , ICAHHAH E.fl 3aB Jia.6 , , I I , I3I4 (1975) BPAMfflHA X HHBepcHOHHafl BOJiBTaMnepor/reTpHH TB9P;I5JX (Jas :vPiMH3flaT , M , CTp 25 II 67 (1972) EPAMHHHHA X , '-lEPIElISBA A.B , JIECTHOBA P.H CTEHHHA H.H , rP73K0BA H.A , SAETTOPHAH H.A 3aB Had ,_46 , 12 , 1076 (1980) lA-iIIOC TeopeTH^ecKHG OCHOBH sjiGKTpoxHMH^iGCKoro anajiHsa m pssjiaT , M , CTp 46 , 234 , 246 H 458 (1974) rE_:^OBGKH'i H , KJTA H OCHOBH • nojiflporpa$iDi IvtapHSJiaT , H , CTp 21 , 65 , I I I , IC2 , 263 H 358 (1965) KOEEEM H , nOBOH7.^A U , IT/JILIIEK MGTOJPJ paanoA-GHHH r o p r n x nopofl H MHHGpaios MHpH3;i;aT , M , 46 (1968) 12^- 3AXAP0B M.C , IHEB B.B MOCKOBGKEffi JI.H 3.neKTpoxHMiia , , 1092 (I97I) 3AXAP0B M.C , HHEB B.B , EAKAHOB B.H SjieKTpOXHMM , , 611 (I97I) IimMEHKO.I.H CnGKTpajiBHti0 anaiiHs j.raHGpaiBHHX aemGCTs AKaHayK H3,i];aT , iilocKBa , 40 (I960) 1 KAIIJIHH A.A , BErU H.A , CTPOF,IBEPr A.P I.A.X , 28 , II KAmiHH A.A , BE^ 3aB JIad , 43 , 2192 (1973) H.A ; MOPJtBIfflOBA H.M , , I05I (1977) KAIIEHH A.A , BEHIH H.A , M0P,IIBHH0BA H.M M0P030BA B.E S.A.X , 33 , 10, 1972 (1978) KAK^m A.A , CTPOiVIBEPE A.P , EAHM 3aB JIad , 43 , , 385 H.H (1977 ) KOPEffivIAH H.M AHajIHTH^GCKaH Xmmn UaJLUX KOHIIGHTpailHH XHMH3j];aT , M , CTp CO H 159 (1966) KPAffiffiKHLI T.A , POfSEHEIAT S,M , HOCAIEBA B.B 3APEHCKffi"l JI.C , HTEHKO B.C I A X , 29 , , 1818 , (1974) KPiQKOBA T.A , CPIHHF:0BA C.IA , APE^LEBA T.B noJiHporpa$H^GCKHlT aHajiHS rocxHMHSflaT , M , 322 (1959) • 18 r/PLS B.K) yHH$Hri;HpOBaHHHE MOTOflH a H a n H a BOJI J.vmiSAQ-'s , I'l 312 (I97I) 125 JiyPLE lO.K) CnpaBoqHHK no aHajiHTH^GCKoft xmmm }[mai3;iaT , M , CTp 19 , 94 , 255 H 271 (I97I) MOPA^IEBCKIl^ D.B PA^iHCKiri ^.lO , 3A,^:JiaiIB A.M CnpaBO^HHK no xmHH XHMH3flaT , H 21 , CTp 172 , 501 , BEran MOR:^HHOBA K M H.A , H 637 (-1967) KAIXHM A A , GEPIEEEA B.H , JIEBHH M.C , TPEGHinMH T.Jl 3aB JIad 46 , 12 , 1083 (1980) 2 KA3APEHI0 B.A , PHEMICA B.E , BAPJIAI.IOBA H.M F.A.X , 37 , , 1652 (1982) KEyS'IAH E.H , HOHOr/IAPEHKO P E E.A.X , 30 , , II32 (1975) PeaKTHBH IVIGTOAH OnpeaGJIGHHH COflGpsaHHH npHMGCH MHuiLHKa CT.G.O.B 1429 - 78 PGaKTHBH viGTOflH OnpGflGJIGHHH rymniBHKa EOCT 10485 - COJ^GpjKaHHH npHMGCH JI.59 POEI'IFIGOH H.M , EHBEP M.B HHTGpr.lGTaJUIH^GCKHG COGJIjmGHHH ( nOfl pGUaKI^HGfi KopHHJiOBa ) POllSEHEJIAT MGTa7uiyprH3;];aT , M , 96 (1970) E.M , PCPAKEBKIB-IA T.A , BEPETffilA P.H 3aB Had , 40 , , 370 (1974) PHXMA53E B r lYiHniBflK •vlGTaJiJiyprH3;i;aT , 'L , 79 GTEHilHA 11,11, (1369) , ^lEPHulIiEBA A.B , SAE^TOPHAH H.A ^ EPAflHHI'IHA X 3aB l a d 46 12 1085 (1380) GOHTMHA O.A - AMnGpOMGTpK^IGCKOG (nOJinpOMGTpH^GCKOG) THTpOBaHHB XHMHSflaT , M , CTp 130 H 140 ( ) 12< TOPOHOBA B § E.A.X , , HQUHKOB B3.H , GOEOJLEBA JI.H , , 985 (1977) TPyUiiEA J I § , KAIffiHH A.A I.A.X , 25 , e , I6I6 (1970) 3 L'lAPJIO P MGTOS;I aHajiHTiriGCKoli XIO/IHH T'.oJintiecTBeHHHfi aHajm3 HGOpraHHHGCKHX COeflHHGHHK XHMH3aaT , M , 777 , PCI , 960 (1969) 1^7 B Cbu Anb va £)uc 34- Arnold I P , Johnson I i: : Talanta ;.1191 (1969 ) 35- Barendrecbt '5 : Stripping Voltamonetry - iiHectroanalytical chemistry.; ( ed Bard A J ) Arnold , London ,- Ifew York ; Vol , 33 ( 1967 ) 36 Butler J H : Ionic equilibrium - A mathematical approach Addison - v/esley 411 Pub Company , IITC , USA , ( 1964 ) 37- Breyer B , Bauer H Pi A G : Polarograpby and Tensarfunetry ; Interscience , ITew York , London ; 58 David J G Ives ( 196^ ) : Heference Electrodes - Theory and practice Aed Pr , Nev/ York , London ; 393 39 Donald G- D ; ; ( 1961 ) : Applications of cbronopotentiometry to problems in analytical chemistry — ( ed Bard A J: ) Electroanalytieal chemistry Vol.3 Marcel Dekker Inc , ITew York ; 40 Florence T M 157 (1966 ) : J Electroanal Cbem ; 26 , 293 ( 1970 ) J Electroanal Cbem ' ; 27 , 275 ( 1970 ) 41 Florence I !.' : 42 Gustaf F , Jerom '.V , Pobert Anal Cbem ; 47 , , 1586 G Vi ( 1975 ) : ; 1^3 43 Huyen Tr Cb , Kopanica M : Collection of caecboslovak Chemical Communication 36 , 2351 44 Koch ( 1971 ) G Handbuch der , Koch - Dedic G Spurenanalyse ; Springer - Verlag A : Berlin , Eeidelberg , New York Teil , 32,39,45,451,457 45 Koltboff I M , Lingane J J : ; Interscience Pub , New York , London 46 Marcbian S , Vartires I , Totir N ; 542 ( 1952 ) ; J Heyrovsky memorial Congress on Polarograpby Proceeding 25-29 ; ( 1974 ) Polarograpby ; II , Czechoslovakia , Prague , August ; ( l^BO ) 47 Michael LI ; J- T , Arnold E G , Richard C D H , Pad : Standard methods for the Examination of V/ater and Wastewater ; 13 tb Ed American Pub Health 62 48 Milner Association , Nevj York , Washington ; ( 1971 ) G ylf G : The principles and application of Polarograpby and other Electroanalytieal Processes ; Longmans , Green and Co , London , Nevv York 200 ( 1957 ) 49 Pi ley J P- , Skirrovi G ' Chemical AP IFC Oceanography : ; , London ; Vol ,269 ( 1975 ) ; 123 50 Sasoni B , Iyengar G V Elemen tai analysis Technical reports of : biological H - 197 I^^EA material , Viena ; ; 37 ( 1980 ) 51- Smith D E : Electroanalytieal ( Ed Bard Marcel Dekker 52 Stulikova A Chemistry J ) Vol , Rew York ; ; ( 1966 ) : J Electroanal Cbem ; 48 , 33 ( 1973 ) 53 Sueba L , Kotrly T : Solution equilibria in analytical chemistry Van Nostrand Peinbold Company , London , ; ( 197^ ) 54 Veits I^ A , Kaplin A A , Stromberg A G Kbim khim tekbnol ; 16 , , 1448 / Tbeo El Ab Electrochemical Stripping Wiley ( 1973 ) 5536 ; Vol 13 , F- 55 Vydra F , StuRik K , Julakova E analysis ( 1975 ) / : ; ; New York , London , Sydney - Toronto p 157 , 211 : ; ( 1976 ) \ ^ 130 Cbu Viet nam 56 Le Ludng : PbUdng pbap pban tich dien the tbdi gian boa tan tren dien cue dia than thuy tinb ; Luan an Pbo tien si ; Vien boa ly va dien boa Heyrovsky Vien ban lam khoa hoe Eiep khic ; Praba ( Ban dicb cua tac gia ) 57 Hekraxop B V ( 1974 ) : Giao trinb boa hoc dai cudng Taj II Nb xb Giao due ; Ha noi ; 217 ; ( 1963 ) 58 Nguyen Tbac Cat , Tu Vong Ngbi , Sao Huu Vinb Cd sd ly tbuyet boa hoc pban tich Nb xb hE va THCN ; Ha noi ; ; ; 185 ( 1980 ) 59- Nguyen Van i)at , Ngo Van Tam ; Pban tieb lUdnb tbue , tbUc pbam Nb xb ^ Bo lUdng thUc va tbue pbam ; Ha noi tr, 63 , 75 ; ( 1974 ) 60 Thuoe tbu - Pbitdng pbap ehuan bi eac dung dieb TCVN 1055 - 71 61 Tran Huu Hoan den TCVN 1037 - 71 : Noi san boa hoc cue hoa chat ) ( ; Cua Vien boa hoe cong ngbiep , Tong , 32 ( 1977 ) 62 Tran Huji Hoan , Nguyen Tbi Pbuc Tap san boa hoe : ( Cua UB KHi.T Ni\ ) ; , ( 1974 ) 65 Tran HUu Hoan , Tu V9ng Ngbi , Tran Chudng Huyen , Cbu Xuan Anb : Noi san boa hoc cue b6a chat ) ( Cua Vien boa hoc cong ngbiep , Tong ; , 13 ( 1983 ) 131 64 Tran Huu Hoan , Tu V9ng Ngbi , Tran CbUdng Huyen , Cbu Xuan Anb ; Cong ngbiep hoa chat , 10 ( Tap san eua Td'ng cue boa chat ) ; ( 1983 ) 65 Tran Huu Hoan , Tran Chudng Huyen Cong ngbiep boa chat , 21 : ( Tap san cua Song cue boa chat ) ; ( 1984 ) 66 Tran HUu Hoan , Tran Chudng Huyen , Tu V9ng Ngbi , Cbu Xuan Anb : Tap cbi boa hoc ; 22 , , 21 ( 1984 ) 67 Tran Huu Hoan , Tran CbUdng Huyen , Tu Vong Ngbi , Gbu Xuan iiub : Tap cbi boa hoc ; 22 , , 23 68 Tran Huu Hoan , Tran CbUdng hvyen Cbu Xuan Anb ( 1934 ) , Tu /ong Ngbi , : Cong ngbiep boa chat ( Tap san eua Tong cue hoa chat ) ; , 13 ( 1984 ) 69 Tran HUu Hoan , Tran CbUdng Huyen , Le Lxi6n^^ Cong ngbiep boa chat , 19 : ( Tap san cua Tong cue boa chat ) ; ( 1982 ) ... chat dien boa cua asen 59 4.2 /Xac dinh asen bSng pbu:dng pbap dien boa boa tan anot 4.2.1 - Cac tin bieu boa tan anot cua dong 4.2.2 - Hoa tan anot he Cu-As 67 72 4.2.3 - Hoa tan anot be Cu-Au... ebuc mV ) vdi tan so tu vai 4e*i chuc den vai tram Hz ( tan so cd ban ) Bong qua binh dien phan la mot hon bdp cac dong eo tan so la boi cua tan so cd ban Bong vdi tan so gap doi tan so cd ban... dinb asen theo he I-Cu-As 85 bling phudng pbap dien the tbdi gian boa tan catot , dung ci/e mang t b u y n g a n dien 95 4.4 / Xac dinb asen bSng pbi:fdng pbap von-ampe boa tan xoay cbieu boa tan