COI 11. i
U \1> JiIlw U iU iiic m b ia i
K-l b ISI. tloC'' nui sho
rcNPOỉ^c in llic ỉ an L!C
: K • h .Ị”.,! K - 2 1' ls l ' !!• K( i 'OỈiituMi
a: !V.II ^ \ i : i c c n i [1>! . I) liiu l lu
m . c L v i i m - ạ Ivt -ACVK : i s i . s A , i h ih c
0 comptoiiiov.N A ' 'h o '.\!ì 111 F iịị 2 . ihc As an\ '.lumrìccẫMi tliỉĩcrL‘ntc> III .1 hncai
|d ' - 1 0' M KC l \\h cn chiinuc
c o n c c titiiitK'H o í \ i t r a t c h u tíc r :rom !(I to 10 M . \\h tlc ĩhv' K-
2b is r: s h u u s .1 c ỉíc c t I)t coiKCM lialiim ot citr.iic h ultci
The p o lc n iiu m c iric s c lc tU M t\ co ctliL icn is ot ih c potasMiim
A N A LY TÍCA L S C IE N C E S 2001, V O L .I7 SU PPLEM ENT
Ì 7 5 1
limitations"’, because j( is very c o n v e n ie n t when determ ining the selectivity for a largc num ber o f caiions. Since the selectivity coettìcieni values depenđ on the composition o f the lon selcciive m cm branc. ih c ic su lis oblained for in ierícn n g cations o f soliđ-conuicí p o iassium selccíive electrodes are shown in Fig. 3. C om parison o f ihe selectiviiy coeíTicicnls o f
interíering ions show ccI ih.H Ih c a m m o n iu in ion is ih c m ost
notable interfercncc ion o f Ihc tcsied ions.
k- •* ! / //lê' (A) —'ì 1 —7/ J/r £ > ■■-^ M y AI*- V
thc plasticized PU m e m b ran e is not s ig n itìcu n tly inỉlu cn ccd by thc ionophore.
Time (seconds)
Fig. 3 Potcnliomeli IC sclcctivity coetTicicnts (IouK |,,,,k i) tbr ihc solid-conlact potassiuni sclcctivc cleclro d es as show n in T ab lc 1. Results were obtained hv the sep arate solution m cthod solutions of 0.01 M chloridc salts m easu rem en l: (A ) in stcady S t a t e mode; and (B) in tlo\v inịeclion systcm .
The solid-coniact pouissium sclcctiv e cleciio d e \\a s mounlcd in ihc FIA svstem d cscrib cd in the lĩxperim enuil Scclion. T)pical FIA Miinals o b iam cd loi SLTICN inịcctiun ot diíĩèrent poiasMum Nohiiion> ;ire NỈnnvn 1(1 Pil: 4. u h r d i demonslr.ilcs Ihc hmh rcpnxkicihi 1 it\ ot the ob-^eiAvđ pc.ll-. heights. The poicniiom ciric rcsp n n sc w ;i\ liiKNi! OYCI' ihc r.muc
in vesiipicil I c . I v iu c v n 5 \ I 0 ' ,1111.1 !(> M I I'! IHH.I-.MIÌI1I
EU ’Í I r o i h o n i i l i / m i Ị H i / i i i h c V / V i / n / \ , I I Ị I \
lĩxainplcs ot im ped.ince spectr.i 1)1' K -la . K*2a. iintl K -2h ;nv showii in Fig. 5. The lìiiili fVei|iiency s e m iđ rc le c.m he ichiicil lo I ho h i i l k i V M N h i i K c i k ) > ; ! i j Ic >.. I p . l v . I ' . ir . 1.
pl.iNlli'1/Cil IM Iiicm hi >mc. \ \ h i k ‘ l l v \ow 'P» can be rc la lc tl lo in tc rliic i.ll c li.u iỉc n .in s lc i iiikl d iilu M o n proccsscs III th c ion s c L v i n c d c c t u u l c Iiiv l«'\\ : : cọiiviK
rcsponsc also m llu c iK v il b \ ilic M )lul-coni.:ct UNCil .1'' lo n -it>-
d cctio n I ra n s d u c e t. A s c.m h o NCCI1 III I; I'J 5. liic k -21 '
Ihe smallcst bulk lesisi.m cc \\h ile th e K -1.1 s lu m s ihc 1:11
°ne The K-2a sh o \\s m ici meili.iic I v k i u o r . All coniact potussium s c lc c ti\c elccin x lcs UI\c the N.I11K’ gcom ciiic capacitancc (Cg = 15 ± 1.3 pF ). I.e . the d iclcciric consiunt ot
Fiu. 4 P o tcn iio m e ư ic rcsp o n ses nt' solid-coniiic! potassiuni sclcciivc clccirotlc in an FIA svsiem F;l<m injccúon condiũons \vcrc ;is rcp o rtcd in the r-Aperimeni.ll scction. (adsbygoogle = window.adsbygoogle || []).push({});
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Fig 5 Im p e ik iiK c spccira (0 1 solid-conuici p o i.^ M iim sc lc c iu c clcctrodcs in 0.1 M K C l.
A s C.1I1 b c SCCI1 i n F itz . 5 . h o i h K - signitìcant W’arburt; ditYusion linc. ch am c iran stcr and ditYusioii proccsscs c a p a c i m n c e o t l l i c s o ỉ i i l c o n t i i
In u isd uction tnkcs placc In com raci
conlrolkxl ivsponNC-i >1' ihc tr
m c m h u tu : h j >amc toi K -2 .1 111 lt> \\ I'|V‘ L|UL'I1C> i v Ị n n i M : ,u ' „ ; s |j; ;ỉu- M>lkl LUnl.lCÍ Kcspnp. M. ' 11111- III'.l-nIiịị. iom c l c ci ri Kk vs U' 1 'sc: ISĨ >
[ and K-2a docs noi sho\\
n tlK a iiiiL ! t a s t i n l c i t a c i a l
cl l ÍI h m l i
. h c r c i o n - ! o - c l e c i r o n
hc K -2h sho\\N d ilíu sio n 'kMK-|L*> SlIKC li u liq u ill
d K-2b. Ihc Jitĩci-cnc0N