The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range a...The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range and the detection limit is 2 6×10 -6 ～3 5×10 -5 mol/L and 1×10 -6 mol/L, respectively. The regressive equation is h(V) =1 169-1 129×10 4 c (mol/L), ( r =-0 999 8). The RSD of the determination for 1 8×10 -5 mol/L phenoxymethylpenicillin potassium is 3 2%, and the recovery is 102 2%( n =8). This method has the advantages of convenient, rapid and without special pretreatment of the sample.展开更多
Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillogra...Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillographic characteristic, second order differential oscillographic voltammety is developed for Co 2+ determination. The linear range of the determination of Co 2+ is 2 00×10 -7 ～ 8 20×10 -6 mol/L and the detection limit is 1 00×10 -7 mol/L. RSD is 1 8% for eight successful determinations of 4 20×10 -6 mol/L Co 2+ . Satisfactory results were obtained by this method in determination of VB 12 content in VB 12 injection liquid.展开更多
Alizarin red S(ARS) causes a sharp incision in 0.1 mol/L KBr. In the presence of Zn 2+ , the incision depth of ARS decreased and a new incision of Zn-ARS coordination compound appeared. A second order differential sim...Alizarin red S(ARS) causes a sharp incision in 0.1 mol/L KBr. In the presence of Zn 2+ , the incision depth of ARS decreased and a new incision of Zn-ARS coordination compound appeared. A second order differential simple oscillographic voltammetric method for determination of Zn 2+ was developed. The method is applied to the determination of zinc gluconate in tablet. The linear range of Zn 2+ was 2.0×10 -7 ～8.6×10 -6 mol/L,detection limit 1×10 -7 mol/L, and RSD for determinations of 4.2×10 -6 mol/L Zn 2+ ( n=7 ) was 2.4%.展开更多
文摘The content of phenoxymethylpenicillin potassium in phenoxymethylpenicillin potassium tablet was determined indirectly with second order differential simple oscillographic voltammetry. The linear concentration range and the detection limit is 2 6×10 -6 ～3 5×10 -5 mol/L and 1×10 -6 mol/L, respectively. The regressive equation is h(V) =1 169-1 129×10 4 c (mol/L), ( r =-0 999 8). The RSD of the determination for 1 8×10 -5 mol/L phenoxymethylpenicillin potassium is 3 2%, and the recovery is 102 2%( n =8). This method has the advantages of convenient, rapid and without special pretreatment of the sample.
文摘Pyridylazo) 2 naphthol(PAN) can cause a sensitive incision on the oscillogram in NaOH solution, and the incision depth would decrease linearly with the increase of the concentration of Co 2+ . Based on this oscillographic characteristic, second order differential oscillographic voltammety is developed for Co 2+ determination. The linear range of the determination of Co 2+ is 2 00×10 -7 ～ 8 20×10 -6 mol/L and the detection limit is 1 00×10 -7 mol/L. RSD is 1 8% for eight successful determinations of 4 20×10 -6 mol/L Co 2+ . Satisfactory results were obtained by this method in determination of VB 12 content in VB 12 injection liquid.
文摘Alizarin red S(ARS) causes a sharp incision in 0.1 mol/L KBr. In the presence of Zn 2+ , the incision depth of ARS decreased and a new incision of Zn-ARS coordination compound appeared. A second order differential simple oscillographic voltammetric method for determination of Zn 2+ was developed. The method is applied to the determination of zinc gluconate in tablet. The linear range of Zn 2+ was 2.0×10 -7 ～8.6×10 -6 mol/L,detection limit 1×10 -7 mol/L, and RSD for determinations of 4.2×10 -6 mol/L Zn 2+ ( n=7 ) was 2.4%.
