Analysis of Diquat by Ion Selective Elecrodes

GJ Moody, RK Owusu, JDR Thomas

Research output: Contribution to journalArticle

17 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.
Original languageEnglish
Pages (from-to)1653-1664
JournalAnalytical Letters
Volume21
Issue number9
DOIs
Publication statusPublished - 9 Sep 1988

Fingerprint Dive into the research topics of 'Analysis of Diquat by Ion Selective Elecrodes'. Together they form a unique fingerprint.

  • Cite this