All Solid State Chromium(III) Selective Potentiometric Sensor Based on 2-(1-(2-((3-(2-Hydroxyphenyl)-1H-pyrozol-1-yl)meth yl)benzyl)-1H-pyrazol-3-yl)phenol

Highly selective all solid state electrochemical sensor based on a synthesized compound i.e. 2-(1-(2-((3-(2-hydroxyphenyl)-1H-pyrozol-1-yl)meth yl)benzyl)-1H-pyrazol-3-yl)phenol (I) as an ionophore has been prepared and investigated for the selective quantification of chromium(III) ions. The effect of various plasticizers, viz. dibutyl phosphonate (DBP), dibutyl(butyl) phosphonate (DBBP), nitrophenyl octyl ether (NPOE), tris-(2-ethylhexyl)phosphonate (TEP), tri-butyl phosphonate (TBP), dioctyl phthalate (DOP), dioctyl sebacate (DOS), benzyl acetate (BA) and acetophenone (AP) along with anion excluders NaTPB (sodium tetraphenyl borate) and KClTPB (potassium(tetrakis-4-chlorophenyl)borate was also studied. The optimum composition of the best performing membrane contained (I):KClTPB:NPOE:PVC in the ratio 15:3:40:42 w/w. The sensor exhibited near Nernstian slope of 20.1 plus or minus 0.2mV/decade of activity in the working concentration range of 1.210 super(-7)-1.010 super(-1)M, and in a pH range of 3.8-4.5. The sensor exhibited a fast response time of 10s and could be used for about 5months without any considerable divergence in potentials. The proposed sensor showed very good selectivity over most of the common cations including Na super(+), Li super(+), K super(+), Cu super(2+), Sr super(2+), Ni super(2+), Co super(2+), Ba super(2+), Hg super(2+), Pb super(2+), Zn super(2+), Cs super(+), Mg super(2+), Cd super(2+), Al super(3+), Fe super(3+)and La super(3+). The activity of Cr(III) ions was successfully determined in the industrial waste samples by using this sensor.