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Applications:
SELECTIVE SORBENTS AND IMAC
- KINETIC PROPERTIES OF THE CHELATING DERIVATIVES OF SPHERICAL CELLULOSE
(Iontosorb SALICYL)
- Tokarova V., Tokar O., Kares J.: Collect.
Czech. Chem. Commun., 51 (1986) 1903-1909
The steric effect of the functional groups on the kinetic properties of the chelating
cellulose ion exchanger Iontosorb SALICYL is demonstrated. The exponential dependence was
found between the diffusion coefficient and the concentration of the ion-exchanging
functional groups and, together with its total mass capacity and its content of water, it
has been used for the estimation of the sorbent kinetic properties. Moreover, the results
obtained show that the attempt to achieve the highest possible capacity of the ion
exchange can lead to a substantial decrease of the sorption rate.
- SORPTION VON METALLIONEN AN CHELATBILDENDEN ZELLULOSEAUSTAUSCHERN
(Iontosorb OXIN, Iontosorb DETA, Iontosorb DTTA)
- Pikulikova Z., Muchova A.: Chem. Papers
41 (1987) 69-76
The capacities of chelateforming ion exchangers on the basic of bead cellulose
Iontosorb OXIN, Iontosorb DETA and Iontosorb DTTA have been determined for Fe(III),
Cu(II), Ni(II), Co(II), Zn(II), Cd(II), Pb(II), Mn(II), Mg(II) and Ca(II) in dependence on
the pH value of the aqueous phase. Of the studied ion exchangers Iontosorb DTTA exhibits
rather high, Iontosorb OXIN medium capacity values, and Iontosorb DETA binds practically
only Cu(II) in the investigated pH range. The capacity values for the studied ions graded
in dependence on pH are connected with the stability of the forming chelates.
The results were used for elaborating of several procedures for the separation of heavy
metal ions from the solutions of simple inorganic and organic pharmaceutical preparations.
- ABTRENNUNG UND BESTIMUNG DER IONEN Cu(II), Zn(II) UND Mg(II) AUS LÖSUNGEN VON
AMINOSÄUREN AM CHELATBILDENDEN IONENAUSTAUSCHER (Iontosorb DTTA)
- Muchova A., Pikulikova Z.: Chem. Papers
42 (1988) 175-182
The possibility of the use of chelateforming ion exchanger Iontosorb DTTA has been
studied for the separation and the determination of cations with different complexing
properties Cu(II), Zn(II) and Mg(II) from the solutions of amino acids: alpha-aminoacetic
acid (Gly), L-aspartic acid (Asp), L-glutamic acid (Glu), L-cysteine chloride (Cys.HCl)
and D,L-methionine (Met). It was proved by the analysis of model mixtures with the
different ratio n(Me) : n(acid) (1:2 - 1:2000)
that the quantity of sorption is substantially influenced by pH of analyzed solution. On
the contrary, the concentration and mutual ratio of components in solution do not
influence the sorption.
- DETERMINATION OF TRACE CONCENTRATIONS OF COPPER BY FIA-FAAS AFTER
PRE-CONCENTRATION ON CHELATING SORBENTS (Iontosorb
DTTA, Iontosorb OXIN)
- Kuban V., Komarek J., Zdrahal Z.: Collect.
Czech. Chem. Commun., 54 (1989) 1785-1794
A flow injection analysis (FIA)-flame atomic absorption spectroscopy (FAAS) apparatus
containing a six-channel sorption equipment with five 3 x 26 mm mikrocolumns packed with
Spheron Oxin 1000, Iontosorb OXIN and Iontosorb DTTA was set up. Combined with sorption
from 0.002 M acetate buffer at pH 4.2 and desorption with 2M-HCl,
copper can be determined at concentrations up to 100, 150 and 200 µg l-1,
respectively. For sample and eluent flow rates of 5.0 and 4.0 ml min-1,
respectively, and a sample injection time of 5 min, the limit of copper determination is LQ
= 0.3 µg l-1, repeatability sr is better than 2 % and recovery is R
= 100 ± 2 %. The enrichment factor is on the order of 102 and is a linear
function of time (volume) of sample injection up to 5 min and of the sample injection flow
rate up to 11 ml min-1 for Spheron Oxin 1000 and Iontosorb DTTA. For times of
sorption of 60 and 300 s, the sampling frequency is 70 and 35 samples/h, respectively. The
parameters of the FIA-FAAS determination (acetylene-air flame) are comparable to or better
than those achieved by ETA AAS. The method was applied to the determination of traces of
copper in high-purity water.
- A STUDY OF LEAD SORPTION BY A CELLULOSE-BASED CHELATING ION EXCHANGER IONTOSORB
DTTA (Iontosorb DTTA)
- Svoboda L., Chutny J., Tomek M.: Collect.
Czech. Chem. Commun., 59 (1994) 106-118
Complexing properties of the chelating ion exchanger based on spherical cellulose
modified by the functional groups of diethylenetriaminetetraacetic acid, Iontosorb DTTA,
have been studied in the sorption of lead from aqueous medium at various experimental
conditions, such as pH, the dynamic or static arrangement of experiment, the presence of
other compounds, the concentration of the ion being sorbed, the form of ion exchanger etc.
The results have been compared with the data found with the known selective ion exchanger
Dowex A-1. Iontosorb DTTA exhibits good kinetics of the ion exchange at the exchange
capacity of 210 mg Pb/g for pH 6. For some applications, its lower mechanical stability
and high water content in the swollen particles may be unfavourable.
- APPLICATION OF CHELATING ION EXCHANGER IONTOSORB DTTA TO DETERMINATION OF LEAD
AND CADMIUM IN SOILS, PLANTS AND FERTILIZERS (Iontosorb
DTTA)
- Svoboda L., Tomek M., Tolar P.: Collect.
Czech. Chem. Commun., 59 (1994) 558-568
The paper investigates a possible application of chelating cellulose ion exchanger
with the functional groups of diethylenetriaminetetraacetic acid to concentrating lead and
cadmium in extracts from soils and industrial fertilizers or mineralizates of plant
materials. A favourable recovery of the metals needs the knowledge of the approximate
content of the complex forming cations in the solutions and the suppression of formation
of iron and aluminium hydroxides during modofication of acidity of extracts to the value
of pH 4 which is the optimum for the formation of chelates. The degree of concentrating
reached the values of fE = 10 - 50, the recovery of lead and cadmium
depended on the nature of sample and was in the range of R = 60 - 100 %.
- SORPTION OF CADMIUM AND LEAD BY CHELATING ION EXCHANGERS IONTOSORB OXIN,
IONTOSORB DETA AND IONTOSORB DTTA (Iontosorb
OXIN, Iontosorb DETA, Iontosorb DTTA)
- Svoboda L., Vorechovsky P.: Collect.
Czech. Chem. Commun., 59 (1994) 1311-1318
The properties of cellulose chelating ion exchangers Iontosorb have been studied in
the sorption of cadmium and lead form aqueous solutions. The Cd(II) and Pb(II) ions are
trapped by the Iontosorb OXIN and Iontosorb DETA ion exchangers most effectively in
neutral and alkaline media but at these conditions formation of stable hydrolytic products
of both metals completes with the exchange equilibria. From this point of view, Iontosorb
DTTA appears to be a more suitable sorbent since it traps the Pb(II) and Cd(II) ions in
acidic media already. Chloride ions interfere with the sorption of the two metals by
Iontosorb DTTA whereas the ionic strength adjusted by the addition of sodium perchlorate
does not affect the exchange capacity of this ion exchanger.
- SORPTION OF CADMIUM AND LEAD BY CHELATING ION EXCHANGER IONTOSORB DITHIZON AND
IONTOSORB SALICYL (Iontosorb SALICYL,
Iontosorb DITHIZON)
- Svoboda L., Jech S.: Collect. Czech. Chem.
Commun., 59 (1994) 1319-1325
The pH and I (ionic strength) dependences of exchange capacity of chelating ion
exchangers Iontosorb based on spherical cellulose modified with functional groups of
dithizone and salicylic acid have been studied in the sorption of Pb(II) and Cd(II) ions.
The cellulosic selective sorbents Iontosorb DITHIZON and Iontosorb SALICYL can be used for
sorption of Pb(II) and Cd(II) ions from aqueous solutions of I = 0 - 1 mol/l (Pb) and I =
0 - 5 mol/l (Cd); the dithizone ion exchanger retains both metals most effectively at pH 7
- 8, the salicyl ion exchanger at pH 5,5 - 6,5 (Pb) or pH 4 - 9 (Cd). Because of the
formation of precipitates of hydrolytic products of the two metals in neutral and alkaline
media, it is suitable to carry out the sorption in media of mild acidity if possible,
particularly so at the metal concentrations above 1 mg/l. Increasing ionic strength
affects the exchange capacity for both metals in a negative way.
- SORPTION OF LEAD BY THE SELECTIVE ION EXCHANGER IONTOSORB DETA
(Iontosorb DETA)
- Svoboda L., Uhlir J., Uhlir Z.: Collect.
Czech. Chem. Commun., 57 (1992) 1393-1404
The properties of Iontosorb DETA, a selective ion exchanger based on modified bead
cellulose with chemically bonded diethylenetriamine functional groups, were studied, and
its applicability to the preconcentration of trace amounts of lead from aqueous solutions
was verified. The conditions of the preconcentration procedure in the column and batch
modes were optimized for this purpose. The results obtained were applied to the
determination of lead in phosphoric acid.
- SORPTION OF LEAD AND CADMIUM ON IONTOSORB P CELLULOSE SORBENT
(Iontosorb P)
- Svoboda L., Canova L.: Collect. Czech.
Chem. Commun., 57 (1992) 2089-2094
The effect of pH and ionic strength on the exchange capacity of sorbents based on
modified bead cellulose was examined for the sorption of Pb2+ and Cd2+
ions. The medium acidic Iontosorb P cation exchanger with functional groups formed by the
phosphoric acid fragment, on the other hand, sorbs lead, and to a lesser extent also
cadmium, also at hihg ionic strengths of the medium even at low pH values.
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