A flow-batch titrator exploiting a one-dimensional optimisation algorithm for end point search

被引:82
作者
Honorato, RS
Araújo, MCU
Lima, RAC
Zagatto, EAG
Lapa, RAS
Lima, JLFC
机构
[1] Univ Fed Pernambuco, Dept Quim Fundamental, Recife, PE, Brazil
[2] Univ Fed Paraiba, Dept Quim, BR-58051970 Joao Pessoa, Paraiba, Brazil
[3] Univ Sao Paulo, Ctr Energia Nucl Agr, Piracicaba, SP, Brazil
[4] Univ Porto, Fac Farm, P-4100 Oporto, Portugal
关键词
flow-batch titrator; Fibonacci method; wines; flow analysis; spectrophotometry;
D O I
10.1016/S0003-2670(99)00366-9
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A flow-batch hybrid system is proposed as a novel approach to automated titration. Sampling and signal processing are done as in usual flow systems, whereas chemical reactions take place in a reaction chamber similar to those found in batch systems. End point is found by means of the Fibonacci method, adapted to act as a one-dimensional optimisation algorithm for fast titration. A model system involving the spectrophotometric NaOH/HCl titration was initially studied, and the feasibility of the approach was further demonstrated in the titration of white wines with NaOH using m-cresol purple as indicator. About 20 samples are run per hour and ca. 0.6 ml of sample and titrant are consumed per determination. Within the 5.2-7.3 g l(-1) acidity (expressed as tartaric acid) range, relative standard deviations of results were estimated as about 0.7% after six-fold processing of typical wine samples, and results are in agreement with those obtained by a classical potentiometric titration, with relative errors <0.8%. (C) 1999 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:91 / 97
页数:7
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