Lanthanum (III) Ion Determination by a New Design Optical Sensor

Abstract

A new selective and sensitive Lanthanum (La) ions optical sensor based on immobilization of N-(2aminoethyl)-salicylaldimine (AESI) prepared on a triacetylcellulose membrane was prepared. The prepared optode exhibited a linear range of 30 to 150 part per billion (ppb) of the La (III) ion concentration with a detection limit of 14.38 ppb. The response time of the newly designed optode was deriven within 30 -60 s, depending on the La (III) ion concentration, however is independent to the pH of the solution in the range of 3.0-5.0. The proposed optode indicated low detection limit, fast response time and also remarkable selectivity regarding to the number of transition metals ions (i.e. Ce 3+ ,Cu 2+ , Cd 2+ , Cr 3+ , Zn 2+ , Hg 2+ , and Fe 2+ ). The optode was successfully regenerated with a thiourea solution, and its response which might be reversible and reproducible showed the relative standard deviation (R.S.D.) of less than 1.48% . This optode was applied for determining the La (III) ions in water samples.

Design of a novel optical sensor for determination of trace amounts of copper by UV–visible spectrophotometry in real samples

“…Compounds containing various donor atoms have been frequently used as ionophores in the structure of optodes because of their ability to form stable complexes with transition metal ions. They produce noticeable sensitivity, selectivity and stability for a specific ion …”

“…The development and applications of optical sensors or optodes have grown rapidly and they are applied for determination of various analytes, including cationic, anionic, neutral and gaseous species, because of advantages of easy fabrication, good sensitivity and selectivity, well‐controlled experimental conditions and simple sample preparation . Optodes are used in combination with inexpensive spectrophotometric or spectrofluorometric techniques to provide simple and fast determination methods with low detection limits and good selectivity …”

“…They produce noticeable sensitivity, selectivity and stability for a specific ion. [6] Various analytical methods have been proposed for the determination of copper at low concentration levels. Most of them are photometric methods, flame atomic absorption spectroscopy, graphite furnace atomic absorption spectroscopy, inductively coupled plasma emission spectrometry and voltammetry.…”

Preparation and characterization of a novel optical chemical sensor for determination of trace amounts of Praseodymium ion by UV/Vis spectrophotometry

“…The yellow crystals were filtered, and subsequentlywere washed with ethanol and dried at room temperature(Fig. 2)[25].…”

Simultaneous adsorption of Hg 2+ , Cd 2+ and Cu 2+ ions from aqueous solution with mesoporous silica/DZ and conditions optimise with experimental design: kinetic and isothermal studies

“…Heavy metal ions are one of the world current problems; since, they are toxic pollutants, and have density more than 5 g/cm 3 and are widely applied in batteries, plastics, pigments, metal plating and petroleum [1][2][3][4]. The lawful amount of heavy metal ions such as Hg 2+ , Cd 2+ and Cu 2+ in water according to World Health Organisation around 0.001, 0.003 and 2 mg/l, respectively [5].…”