Simultaneous determination of trace Sn(II) and Sn(IV) using differential pulse polarography and application

Ülkü ÜNAL and Güler SOMER

Article Details

Simultaneous determination of trace Sn(II) and Sn(IV) using differential pulse polarography and application

Authors:

Ülkü ÜNAL and Güler SOMER

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2011 Vol.35 Issue 1, pp.73-85

Document Type:

Article

Publication Date:

12/2010

Document Language:

Turkish

Document ID (Org No.):

2000727910

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527

Abstract:

 

A new method was established for the simultaneous  determination of Sn(II) and Sn(IV) using differential pulse  polarography (DPP).  Among several electrolytes, 0.1 M NaOH in the  presence of 0.1 M KNO3 was found to be the most suitable one.  In  this medium, Sn(II) had 2 peaks, at -0.74 and -1.17 V, which were  sharp and very sensitive.  Sn(IV), on the other hand, had a very small  peak at -0.92 V when its concentration was higher than 4.0 \times  10-4 M. Thus, it was decided to determine Sn(IV) after reduction  into Sn(II).  In the presence of both Sn(II) and Sn(IV), Sn(II) was  first determined from the peak at -1.17 V, and then Sn(IV) was  determined after its reduction with NaBH4 into Sn(II).  The detection  limit was 5.5 \times 10-7 M and 8.2 \times 10-7 M for Sn(II) and  Sn(IV), respectively.  The interference effect of the most common  ions, Fe(III), Cu(II), Pb(II), Cd(II), and Zn(II), was investigated.  Only copper and iron had an interfering effect during the speciation  procedures, since they oxidized Sn(II), which was formed after  reduction of Sn(IV) for its determination.  This effect of Cu(II) and  Fe(III) ions could be eliminated by the reducing agent NaBH4, which  was used for the reduction of Sn(IV).  Since Pb(II) and Cd(II) peaks  overlap with the first peak of Sn(II) at -0.74V, Sn(II) was determined  using the second peak, at -1.17 V. In a synthetic sample containing  Sn(II), Sn(IV), and all common ions, the total content of tin (2.0  \times 10-5 M) was found to be (2.07 \pm 0.38) \times 10-5 M  (90% CI, N = 3).  This method was applied for the determination of tin in canned tomato sauce.

 

A new method was established for the simultaneous  determination of Sn(II) and Sn(IV) using differential pulse  polarography (DPP).  Among several electrolytes, 0.1 M NaOH in the  presence of 0.1 M KNO3 was found to be the most suitable one.  In  this medium, Sn(II) had 2 peaks, at -0.74 and -1.17 V, which were  sharp and very sensitive.  Sn(IV), on the other hand, had a very small  peak at -0.92 V when its concentration was higher than 4.0 \times  10-4 M. Thus, it was decided to determine Sn(IV) after reduction  into Sn(II).  In the presence of both Sn(II) and Sn(IV), Sn(II) was  first determined from the peak at -1.17 V, and then Sn(IV) was  determined after its reduction with NaBH4 into Sn(II).  The detection  limit was 5.5 \times 10-7 M and 8.2 \times 10-7 M for Sn(II) and  Sn(IV), respectively.  The interference effect of the most common  ions, Fe(III), Cu(II), Pb(II), Cd(II), and Zn(II), was investigated.  Only copper and iron had an interfering effect during the speciation  procedures, since they oxidized Sn(II), which was formed after  reduction of Sn(IV) for its determination.  This effect of Cu(II) and  Fe(III) ions could be eliminated by the reducing agent NaBH4, which  was used for the reduction of Sn(IV).  Since Pb(II) and Cd(II) peaks  overlap with the first peak of Sn(II) at -0.74V, Sn(II) was determined  using the second peak, at -1.17 V. In a synthetic sample containing  Sn(II), Sn(IV), and all common ions, the total content of tin (2.0  \times 10-5 M) was found to be (2.07 \pm 0.38) \times 10-5 M  (90% CI, N = 3).  This method was applied for the determination of tin in canned tomato sauce.

Article Details

Simultaneous determination of trace Sn(II) and Sn(IV) using differential pulse polarography and application

Authors: Ülkü ÜNAL and Güler SOMER

Publisher: TUBITAK

Journal: Turkish Journal of Chemistry 2011 Vol.35 Issue 1, pp.73-85

Document Type: Article

Publication Date: 12/2010

Document Language: Turkish

Document ID (Org No.): 2000727910

Frequency: Bimonthly

eISSN: 1303-6130

pISSN: 1300-0527

Issues

Authors:

Ülkü ÜNAL and Güler SOMER

Publisher:

TUBITAK

Journal:

Turkish Journal of Chemistry 2011 Vol.35 Issue 1, pp.73-85

Document Type:

Article

Publication Date:

12/2010

Document Language:

Turkish

Document ID (Org No.):

2000727910

Frequency:

Bimonthly

eISSN:

1303-6130

pISSN:

1300-0527