Abstract
An automated procedure for photometric titration of red wine and associated
instrumentation is described. The procedure was based on the flow-batch approach
implemented employing multicommutation. The photometric detection was carried out
using a homemade LED-based photometer. The mixing device, LED, and photodetector
were attached to the titration chamber in order to form a compact and small-sized unit. The flow system comprised an automatic injector and three-way solenoid valves, which were
controlled by a microcomputer through an electronic interface card. The software, written
in Quick BASIC 4.5, was designed with abilities to accomplish all steps of the titration
procedure including data acquisition and real-time processing to decide about the course of titration in the following step and so forth, until the titration endpoint was reached. The usefulness of the proposed titration system was demonstrated by analyzing red wine samples. When results were compared with those obtained using the AOAC reference
method, no significant difference was observed at the