نتایج جستجو برای: perchlorate selective electrode
تعداد نتایج: 263113 فیلتر نتایج به سال:
The use of calixpyrroles as cation monitoring systems is very limited. The importance of fundamental studies for providing the basis for the selection of an appropriate ionophore for use in the design of ion selective electrodes cannot be overemphasised. Thus a new ditopic receptor, namely meso-tetramethyltetrakis-(4N,N-diethylacetamide) phenoxymethyl]calix[4]pyrrole (CPA), bearing cation and a...
a pvc ion-selective membrane electrode based on cd-tetraphenyl porphyrine as a carrier was prepared fordetermination of mno4- ion. this electrode revealed good selectivity toward permanganate ion over a widevariety of anions. effects of some experimental parameters such as nature of the plasticizer, the amounts ofcarrier and additive, and concentration of the internal solution on the potential ...
The composition of the passive layers formed on Zn electrode in naturally aerated and de-aerated 0.1 M KClO4 solution were studied using X-ray hotoelectron spectroscopic measurements (XPS). A correlation between the presence of dissolved O2 and the formation of an interior passive ayer was carried out. Librated Cl− from the perchlorate reduction reaction was detected in its solutions during Zn ...
the preparation of polymer membrane selective to iron(ii) ion and its application to ion-selectiveelectrode is reported here. pvc membrane contains iron–selective n-phenylaza-15-crown-5 asionophore. the membrane electrode is highly selective to iron(ii) ion and exhibit good linearresponse over a wide concentration range of 1.0 × 10-2 to 1.0 × 10-6 m with nernstian slope of29.2 ± 0.6 mv per deca...
a highly selective electrode for bromide ion based on aza pyrilium derivative as an excellentionophore is described.the sensor exhibits a good linear response with a slope of ( 60±1 ) mv per decadeover the concentration range of ( 1×10-3 – 9×10-6 m ) , and a detection limit of ( 3×10-6 m ) of bromideions .the electrode response is independent of ph in the range of(4.0 –9.5).selectivity coeffici...
tea is the second most commonly consumed beverage world wide. tea ( camellia sinensis ) is a naturally rich source of fluoride. the quantity of fluoride intake is important in optimizing its dental caries-preventive role. intense concentration of fluoride in tea, can lead to excessive fluoride intake which may cause health problems in turn. the measurement of fluoride intake usually requires in...
In this study, an electrochemical sensor based on a boron doped diamond electrode (BDDE) was developed for the determination of naproxen (NAP) using poly(aniline-2-sulfonic acid)/boron electrode, p(A2SA/BDDE). Polymerization A2SA conducted in water/acetonitrile (1:1) mixture containing 0.1 M sodium perchlorate (NaClO4) bare BDDE and properties studied by cyclic voltammetry ferricyanide/KNO3 sol...
a new cesium ion selective pvc membrane based on parent calix [4] arene was developed for potentiometric determination of cesium in environmental samples. the electrode based on p-5,11,17,23tetra(tertbutyl) 25,26,27,28-tetrahydroxy calix[4]arene(thc) as ionophor ,dibutyl phthalate (dbp)as plasticizer ,sodium tetra phenyl borate(natpb)and oleic acid as lipophilic salt and additive showed the bes...
potentiometric investigation on {h2o+nano3+peg1500} mixtures were made at t=308.15k, using electrochemical cells with two ion-selective electrodes, (na+ glass) as the cation ion-selective electrode against (no3- solvent-polymer pvc) as the anion ion-selective electrode. the mean ionic activity coefficients of nano3 were measured at different concentrations of nano3 and peg. maximum concentrati...
Ammonium perchlorate is widely used as an oxidizer in the propellant formulation and pyrotechnics According to military standard having high purity and free of impurities such as chlorate . So, the removal of impurities in the production of ammonium perchlorate will be highly regarded. In this paper, the removal of chlorate was investigated by reducing process using metal nanoparticles. In this...
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