.5.1. Potentiometric determination using standard additions
method in batch conditions
The standard additions method was applied by adding small
portions of 1.0 × 10−2 M standard Tol solution to 50 ml distilled
water containing 1.189–23.780 mg Tol The results of the determination
of Tolterodine in the pure substance and the pharmaceutical
preparation Detrusitol® capsules 4 mg, spiked artificial urine and
plasma samples by standard additions method are given in Table 2.
The mean recovery values for determining Tol ranged from 99.7
to 100.4% and 97.4 to 99.5% with coefficient of variation ranging
from 0.5 to 1.0 and 0.3 to 0.9 for Tol-PTA and Tol-STA electrodes,
respectively for pure drug solutions.
The mean recovery values for determining tolterodine using
Tol-PTA electrode ranged from 97.0 to 99.5% with coefficient of
variation 0.2–0.8 for Detrusitol® capsules, 98.2–100.5% with coef-
ficient of variation 0.3–0.8 for spiked artificial urine samples and
97.4–99.5% with coefficient of variation 0.4–0.9 for spiked artifi-
cial plasma samples. The mean recovery values for determining
Tolterodine using Tol-STA electrode 98.2–102.5% with coefficient
of variation 0.5–0.9, for Detrusitol® capsules 97.0–98.8% with coef-
ficient of variation 0.3–0.6 for spiked artificial urine samples and
98.1–100.5% with coefficient of variation ranged from 0.4 to 0.7 for
spiked artificial plasma samples.