Analysis of Diquat by Ion Selective Elecrodes

GJ Moody, RK Owusu, JDR Thomas

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The calibration response of a diquat bis(tetra-4-chlorophenylborate) (DQT. 2T4C1PB) based ISE for DQT was stable for 55 days. The ISE calibration slope and minimum detectable activity a(min) of DQT were in the ranges (S.D. in parentheses) 30(0.6) to 28(1.7) mV/log a (DQT) and 4(3) 10-9M to 3(0.2) 10-6M, respectively. The times for 100% response were 3 s at 1 mM and 25 s at 1 μM and the ISE was useable at pH 2 to 12 and over a sample temperature range of 2 to 50C. Samples (2.54-244 μM DQT) could be determined using the standard addition method with about a -5% error and a precision of 7 to 8%. For comparison, DQT was also determined by titration with sodium tetraphenylborate (NaTPB) using DQT. 2TPB and TBA. TPB ISEs as TPB sensors. The errors were in the range of 12 to 20% for DQT analysis in deionized water, sodium chloride solution or simulated serum.
LanguageEnglish
Pages1653-1664
JournalAnalytical Letters
Volume21
Issue number9
DOIs
Publication statusPublished - 9 Sep 1988

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Diquat
Calibration
Tetraphenylborate
Ions
Deionized water
Sodium chloride
Titration
Sodium Chloride
Sodium
Temperature
Water
Sensors
Serum

Cite this

Moody, GJ ; Owusu, RK ; Thomas, JDR. / Analysis of Diquat by Ion Selective Elecrodes. In: Analytical Letters. 1988 ; Vol. 21, No. 9. pp. 1653-1664.
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abstract = "The calibration response of a diquat bis(tetra-4-chlorophenylborate) (DQT. 2T4C1PB) based ISE for DQT was stable for 55 days. The ISE calibration slope and minimum detectable activity a(min) of DQT were in the ranges (S.D. in parentheses) 30(0.6) to 28(1.7) mV/log a (DQT) and 4(3) 10-9M to 3(0.2) 10-6M, respectively. The times for 100{\%} response were 3 s at 1 mM and 25 s at 1 μM and the ISE was useable at pH 2 to 12 and over a sample temperature range of 2 to 50C. Samples (2.54-244 μM DQT) could be determined using the standard addition method with about a -5{\%} error and a precision of 7 to 8{\%}. For comparison, DQT was also determined by titration with sodium tetraphenylborate (NaTPB) using DQT. 2TPB and TBA. TPB ISEs as TPB sensors. The errors were in the range of 12 to 20{\%} for DQT analysis in deionized water, sodium chloride solution or simulated serum.",
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Moody, GJ, Owusu, RK & Thomas, JDR 1988, 'Analysis of Diquat by Ion Selective Elecrodes', Analytical Letters, vol. 21, no. 9, pp. 1653-1664. https://doi.org/10.1080/00032718808066518

Analysis of Diquat by Ion Selective Elecrodes. / Moody, GJ; Owusu, RK; Thomas, JDR.

In: Analytical Letters, Vol. 21, No. 9, 09.09.1988, p. 1653-1664.

Research output: Contribution to journalArticle

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AB - The calibration response of a diquat bis(tetra-4-chlorophenylborate) (DQT. 2T4C1PB) based ISE for DQT was stable for 55 days. The ISE calibration slope and minimum detectable activity a(min) of DQT were in the ranges (S.D. in parentheses) 30(0.6) to 28(1.7) mV/log a (DQT) and 4(3) 10-9M to 3(0.2) 10-6M, respectively. The times for 100% response were 3 s at 1 mM and 25 s at 1 μM and the ISE was useable at pH 2 to 12 and over a sample temperature range of 2 to 50C. Samples (2.54-244 μM DQT) could be determined using the standard addition method with about a -5% error and a precision of 7 to 8%. For comparison, DQT was also determined by titration with sodium tetraphenylborate (NaTPB) using DQT. 2TPB and TBA. TPB ISEs as TPB sensors. The errors were in the range of 12 to 20% for DQT analysis in deionized water, sodium chloride solution or simulated serum.

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