The high sensitivity in the arrangement with the mixing
gradient chamber when using optimum flow parameters is
accompanied by low maximum sampling frequency. In general,
the sampling frequency is directly proportional to the
flow-rate. On the other hand, the sensitivity of the determination
is decreased with the increase of the flow-rate in our
experiments. Thus, we tried to experimentally determine the
highest flow-rate at which the sensitivity should be still sufficient.
It was found that it is possible to employ a flow-rate of
up to 1.6 ml min−1, where the sensitivity is decreased (1.5-
fold) but the rate of sample addition can increase significantly
(4-fold). It is possible to process up to 30 samples per hour,
while only 8 samples per hour can be processed at a flowrate
of 0.4 ml min−1. The calibration ranges do not change in
these conditions.