ANALYTICAL BALANCE AS A DETECTOR IN FLOW-ANALYSIS

被引:6
作者
JACINTHO, AO
ARRUDA, MAZ
ZAGATTO, EAG
REIS, BF
机构
[1] Centro de Energia Nuclear na Agricultura, Universidade de S. Paulo, 13400 Piracicaba, SP
关键词
FLOW SYSTEM; GRAVIMETRY; ANALYTICAL BALANCE DETECTOR;
D O I
10.1016/0003-2670(92)85205-K
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
A continuous-flow system with gravimetric detection is proposed. Samples and reagents are injected into air carrier streams and the precipitate yielded after merging of these streams is retained by a filtration unit, placed on the plate of an analytical balance. After partial and reproducible drying, the precipitate is weighed. Dissolution and filter conditioning under segmented-flow conditions are thereafter achieved by passing intermittent washing solutions through the filter. The potential and limitations of the approach, the need for a calibration graph and the main parameters involved were studied with a model system based on barium oxalate. The system handles ca. 30 samples h-1, yielding results in agreement with expected values (R.S.D. ca. 3%).
引用
收藏
页码:129 / 133
页数:5
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