A comparative study on PVC based sensors in determination of molybdenum

Abstract

The proposed work described the synthesis of neutral ionophores; 4,8-diaza-3,3,10,10-tetramethyl-1,2dithiacyclodecane (S 1 ), 5,8-diaza-3,3,10,10-tetramethyl-1,2 dithiacyclodecane-N,N 00 -diacetic acid (S 2 ) and N,N 00 -bis(2,2-dimethyl-2-mercaptoethyl)ethylenediamine-N,N-diacetic acid (S 3 ) used for comparative analysis in determination of molybdenum(V) as PVC-based membrane sensors. The best result was obtained with sensor no. 7 based on S 3 ionophore with membrane composition (w/w, mg%); 5.0(S) : 30.0(PVC) : 5.0(KTpClPB) : 60.0(o-NPOE) showing a working range of 2.3 Â 10 À7 -1.0 Â 10 À2 M with a detection limit of 1.2 Â 10 À7 M and a toleration of non-aqueous media up to 15% with slope of 11.7 mV/decade of activity. The sensor no. 7 can also be used to assess the Mo(V) concentration in different natural samples (water bodies, soils, root nodules and urine samples) with comparative analysis of ETAAS and spectrophotometric methods. The proposed sensor no. 7 can be used 2.5 months without any distortion in results after that leaching of ionophore was observed from the membrane phase in aqueous solutions of Mo(V). The proposed sensor has shown a good dynamic response time of 11 s.

Trace Elements in the Human Milk

“…In all Mo-enzymes, functional molybdenum is present in the form of an organic component, molybdopterin [20]. Dietary molybdenum deficiencies are associated with growth problems, neurological disorders, and premature death [26]. On the other hand, its excess is associated with an increase in susceptibility to gout, hyperuricemia, and xanthuria [26].…”

“…Dietary molybdenum deficiencies are associated with growth problems, neurological disorders, and premature death [26]. On the other hand, its excess is associated with an increase in susceptibility to gout, hyperuricemia, and xanthuria [26]. Concentrations of molybdenum in breast milk increase significantly during lactation [8].…”

Novel sensor fabrication for the determination of nanomolar concentrations of Ce3+ in aqueous solutions

“…It is widely used in production of ductile iron, cast iron and aluminium alloys and some stainless steels. [12][13][14][15][16][17][18][19][20][21][22] This led us to construction and design a new potentiometric carbon paste sensor for the determination of Ce(III) in aqueous solutions. This can cause lung embolisms, especially during long-term exposure.…”

“…Potentiometric sensors based on carbon paste electrodes offer several advantages such as ease of preparation, simple instrumentation, fast response, wide dynamic range, reasonable selectivity and low cost. [12][13][14][15][16][17][18][19][20][21][22] This led us to construction and design a new potentiometric carbon paste sensor for the determination of Ce(III) in aqueous solutions.…”