Potentiometric FIA of acids and bases in nonaqueous solvents and its application to lubricating oils

Katafuchi Akiko, Toshihiko Imato, Ishibashi Nobuhiko, Yagi Jun-ichi, Takahara Kozo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A new method for the FIA of acid and base samples in nonaqueous solvents was proposed. This analysis, using a “pH” buffer solution and a glass electrode, is based on the detection of pH changes in the buffer solution by the glass electrode when the sample acids or bases are mixed with the buffer solution. The sample (200 µ1) injected into an ethanol stream was merged with the stream of the buffer solution (e.g. 5x10–3 M tetrabutylammonium butyrate-5x10–3 M butyric acid, M=moldm–3) containing 0.1 M lithium chloride. The potential change of the glass electrode was observed as a peak-shaped signal, and a linear relationship between the peak height and the concentration of samples was observed. Many organic acids as well as aliphatic and some aromatic amines were determined by the proposed FIA titration of ca. 40 samples/h with less than 0.5% relative standard deviation. The sensitivity of the proposed method was discussed in connection with the relative acidities (apparent pKa's) of samples to those of the buffer acids. The proposed method was successfully applied to the determination of the total alkalinity in lubricating oils.

Original languageEnglish
Pages (from-to)109-114
Number of pages6
JournalBunseki Kagaku
Volume39
Issue number2
DOIs
Publication statusPublished - Jan 1 1990

Fingerprint

Lubricating oils
Buffers
Acids
Glass
Electrodes
Lithium Chloride
Butyric Acid
Butyrates
Organic acids
Alkalinity
Titration
Acidity
Amines
Ethanol
Fatty Acids

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry

Cite this

Potentiometric FIA of acids and bases in nonaqueous solvents and its application to lubricating oils. / Akiko, Katafuchi; Imato, Toshihiko; Nobuhiko, Ishibashi; Jun-ichi, Yagi; Kozo, Takahara.

In: Bunseki Kagaku, Vol. 39, No. 2, 01.01.1990, p. 109-114.

Research output: Contribution to journalArticle

Akiko, Katafuchi ; Imato, Toshihiko ; Nobuhiko, Ishibashi ; Jun-ichi, Yagi ; Kozo, Takahara. / Potentiometric FIA of acids and bases in nonaqueous solvents and its application to lubricating oils. In: Bunseki Kagaku. 1990 ; Vol. 39, No. 2. pp. 109-114.
@article{ce3ef5f5851e4e5b9490f34f42ad227c,
title = "Potentiometric FIA of acids and bases in nonaqueous solvents and its application to lubricating oils",
abstract = "A new method for the FIA of acid and base samples in nonaqueous solvents was proposed. This analysis, using a “pH” buffer solution and a glass electrode, is based on the detection of pH changes in the buffer solution by the glass electrode when the sample acids or bases are mixed with the buffer solution. The sample (200 µ1) injected into an ethanol stream was merged with the stream of the buffer solution (e.g. 5x10–3 M tetrabutylammonium butyrate-5x10–3 M butyric acid, M=moldm–3) containing 0.1 M lithium chloride. The potential change of the glass electrode was observed as a peak-shaped signal, and a linear relationship between the peak height and the concentration of samples was observed. Many organic acids as well as aliphatic and some aromatic amines were determined by the proposed FIA titration of ca. 40 samples/h with less than 0.5{\%} relative standard deviation. The sensitivity of the proposed method was discussed in connection with the relative acidities (apparent pKa's) of samples to those of the buffer acids. The proposed method was successfully applied to the determination of the total alkalinity in lubricating oils.",
author = "Katafuchi Akiko and Toshihiko Imato and Ishibashi Nobuhiko and Yagi Jun-ichi and Takahara Kozo",
year = "1990",
month = "1",
day = "1",
doi = "10.2116/bunsekikagaku.39.2_109",
language = "English",
volume = "39",
pages = "109--114",
journal = "Bunseki Kagaku",
issn = "0525-1931",
publisher = "公益社団法人日本分析化学会",
number = "2",

}

TY - JOUR

T1 - Potentiometric FIA of acids and bases in nonaqueous solvents and its application to lubricating oils

AU - Akiko, Katafuchi

AU - Imato, Toshihiko

AU - Nobuhiko, Ishibashi

AU - Jun-ichi, Yagi

AU - Kozo, Takahara

PY - 1990/1/1

Y1 - 1990/1/1

N2 - A new method for the FIA of acid and base samples in nonaqueous solvents was proposed. This analysis, using a “pH” buffer solution and a glass electrode, is based on the detection of pH changes in the buffer solution by the glass electrode when the sample acids or bases are mixed with the buffer solution. The sample (200 µ1) injected into an ethanol stream was merged with the stream of the buffer solution (e.g. 5x10–3 M tetrabutylammonium butyrate-5x10–3 M butyric acid, M=moldm–3) containing 0.1 M lithium chloride. The potential change of the glass electrode was observed as a peak-shaped signal, and a linear relationship between the peak height and the concentration of samples was observed. Many organic acids as well as aliphatic and some aromatic amines were determined by the proposed FIA titration of ca. 40 samples/h with less than 0.5% relative standard deviation. The sensitivity of the proposed method was discussed in connection with the relative acidities (apparent pKa's) of samples to those of the buffer acids. The proposed method was successfully applied to the determination of the total alkalinity in lubricating oils.

AB - A new method for the FIA of acid and base samples in nonaqueous solvents was proposed. This analysis, using a “pH” buffer solution and a glass electrode, is based on the detection of pH changes in the buffer solution by the glass electrode when the sample acids or bases are mixed with the buffer solution. The sample (200 µ1) injected into an ethanol stream was merged with the stream of the buffer solution (e.g. 5x10–3 M tetrabutylammonium butyrate-5x10–3 M butyric acid, M=moldm–3) containing 0.1 M lithium chloride. The potential change of the glass electrode was observed as a peak-shaped signal, and a linear relationship between the peak height and the concentration of samples was observed. Many organic acids as well as aliphatic and some aromatic amines were determined by the proposed FIA titration of ca. 40 samples/h with less than 0.5% relative standard deviation. The sensitivity of the proposed method was discussed in connection with the relative acidities (apparent pKa's) of samples to those of the buffer acids. The proposed method was successfully applied to the determination of the total alkalinity in lubricating oils.

UR - http://www.scopus.com/inward/record.url?scp=85011184183&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85011184183&partnerID=8YFLogxK

U2 - 10.2116/bunsekikagaku.39.2_109

DO - 10.2116/bunsekikagaku.39.2_109

M3 - Article

AN - SCOPUS:85011184183

VL - 39

SP - 109

EP - 114

JO - Bunseki Kagaku

JF - Bunseki Kagaku

SN - 0525-1931

IS - 2

ER -