Abstract
The construction and performance characteristics of a novel Iron(III) membrane sensor based on (37-bis-[(diethoxy-thiophosphoryl)-oxy]-5,11,17,23,29,35-hexa-kis-(1,1-dimethylethyl)-calix[6]-arene-38,39,40,41,42-pentol) (A) were reported in this paper. The sensor was prepared by incorporating compound (A) into a plasticized polyvinyl chloride PVC membrane. The electrode reveals a Nernstian behavior over a wide iron ion concentration range (1.0 × 10-2 - 1.0 × 10-4 mol·L-1), and relatively low detection limit (1.0 × 10-5 mol·L-1). The potentiometric response was independent on the pH of the solution in the range of 4 - 7. The electrode showed a very short response time (
Highlights
Different ionophores were used for preparing iron ion-selective electrodes
Electrodes I and II comprised the membrane with NPOE plasticizer, while electrode-III comprised membrane with DOS as plasticizer
The obtained results agreed with those obtained from a spectrophotometric method based on 1,10-phenanthroline according to previously discussed procedures [13]
Summary
Benzilthiocarbohydrazide [1] and N-(2-hydroxyethyl) ethylenediamine-N,N’,N”-triacetic acid [2] were used as sensor materials for preparing a PVC (polyvinyl chloride) membrane ferric ISE by Zamani et al They only worked up to pH 4.5, they had very sensitive linear ranges (10−2 - 10−7 and 10−2 - 10−9 M) Both electrodes had a life time of more than 10 weeks. A novel ion selective potentiometric sensor for direct determination of Fe(III) in the presence of Fe(II) was constructed by Mashhadizadeh et al [7] It was based on 2-[(2-hydroxy-1-propenyl-buta-1,3-dienylimino)-methyl]-4-p-tolylazophenol as a neutral carrier. Ferroin-TPB was applied as a membrane sensor for the potentiometric determination of either Fe2+ or Fe3+ ion by Hassan and Marzouk [10] This type of sensor was based on responding to the charged ion complex “ferrion”. None of the previous work suggested the use of calix-6-arene for iron determination
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