Abstract
A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.
| Original language | English |
|---|---|
| Pages (from-to) | 669-673 |
| Number of pages | 5 |
| Journal | Talanta |
| Volume | 48 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 1999 |
| Externally published | Yes |
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Keywords
- 2-Aminoperimidinium bromide
- Plasticized poly (vinyl chloride) membrane
- Potentiometric back-titration
- Sea water
- Sodium tetrakis (4-fluorophenyl) borate
- Sulfate ion
ASJC Scopus subject areas
- Analytical Chemistry
- Spectroscopy
Cite this
Determination of sulfate ion by potentiometric back-titration using sodium tetrakis (4-fluorophenyl) borate as a titrant and a titrant-sensitive electrode. / Masadome, Takashi; Asano, Yasukazu.
In: Talanta, Vol. 48, No. 3, 1999, p. 669-673.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Determination of sulfate ion by potentiometric back-titration using sodium tetrakis (4-fluorophenyl) borate as a titrant and a titrant-sensitive electrode
AU - Masadome, Takashi
AU - Asano, Yasukazu
PY - 1999
Y1 - 1999
N2 - A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.
AB - A potentiometric back-titration method for the determination of sulfate ions using a plasticized poly(vinyl chloride) membrane electrode sensitive to a titrant is described. The method is based on ion association between the excess of 2-aminoperimidinium added to the sulfate ion in the sample and sodium tetrakis (4-fluorophenyl) borate (FPB) in the titrant. The titration end-point was detected as a sharp potential change due to an increase in the concentration of the free FPB at the equivalence point. The end-point was detected even in the presence of a 20-fold excess of common cations and anions relative to the concentration of the sulfate ion within ~2% of titration error. A linear relationship between the concentration of the sulfate ion and the end-point volume of the titrant exists in the sulfate ion concentration range from 2 x 10-4 to 3 x 10-3 mol l-1 using 10-2 mol l-1 FPB solutions as the titrant. The present method could be applied to determine sulfate ions in sea water.
KW - 2-Aminoperimidinium bromide
KW - Plasticized poly (vinyl chloride) membrane
KW - Potentiometric back-titration
KW - Sea water
KW - Sodium tetrakis (4-fluorophenyl) borate
KW - Sulfate ion
UR - http://www.scopus.com/inward/record.url?scp=0032915824&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0032915824&partnerID=8YFLogxK
U2 - 10.1016/S0039-9140(98)00290-2
DO - 10.1016/S0039-9140(98)00290-2
M3 - Article
C2 - 18967507
AN - SCOPUS:0032915824
VL - 48
SP - 669
EP - 673
JO - Talanta
JF - Talanta
SN - 0039-9140
IS - 3
ER -