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Development of a specific and highly sensitive optical chemical sensor for determination of Hg(II) based on a new synthesized ionophore

 

Development of a specific and highly sensitive optical chemical sensor for determination of Hg(II) based on a new synthesized ionophore

 
 
 

Highlights

 

A new optical sensor is developed for determination of trace amounts of Hg(II) ions.

A recently synthesized ionophore incorporating with ETH5294 and PVC was used.

The absorbance of the optode was measured and used for Hg(II) determination.

Hg(II) ions can be detected at ultra trace level as low as 0.18 pmol L− 1.

 

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Abstract

A novel optode for determination of Hg(II) ions is developed based on immobilization of a recently synthesized ionophore, 7-(1H-imidazol-1-ylmethyl)-5,6,7,8,9,10-hexahydro-2H-1,13,4,7,10 benzodioxatriaza cyclopentadecine-3,11(4H,12H)-dione, in a PVC membrane. Dioctyl sebacate was used as a plasticizer, sodium tetraphenylborate as an anionic additive and ETH5294 as a chromoionophore. The response of the optode was based on the complexation of Hg(II) with the ionophore in the membrane phase, resulting an ion exchange process between Hg(II) in the sample solution and H+ in the membrane. The effects of pH and amounts of the ionophore, chromoionophore, ionic additive and type of plasticizer on the optode response were investigated. The selectivity of the optode was studied in the present of several cations. The optode has a linear response to Hg(II) in the range of 7.2 × 10− 13–4.7 × 10− 4 mol L− 1 with detection limit of 0.18 pmol L− 1. The optode was successfully applied to the determination of Hg(II) in real samples.

 

Journal Papers
Month/Season: 
October
Year: 
2013