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The construction and characteristics of two potentiometric differential
microdetectors equipped with two similar ion-selective membranes are
described. The two membranes used were of Ag
2
S for
Ag
I
and S
2-
and
CuS–Ag
2
S for Cu
II
. The active volume of the
measuring cell was about 3 µl. Calibration plots were linear, with
almost theoretical slopes, down to 10
-6
mol
dm
-3
Ag
I
, 5 ×
10
-6
mol dm
-3
Cu
II
and 10
-5
mol
dm
-3
S
2-
. The
throughput was 40–60 samples h
-1
depending on the sample. The errors in the determination of the
above-mentioned ions were below 3.9%.
