Exploiting of Green Synthesized Metal Oxide Nanoparticles in the Potentiometric Determination of Metformin Hydrochloride in Pharmaceutical Products

Table 5

Intraday and interday assays of MTF solution using MTF-PT-Al₂O₃NP-modified and MTF-PT-NiONP-modified sensors.

	MTF-PT-Al2O3NP-modified sensor			MTF-PT-NiONP-modified sensor
	Test sample	Found	% recovery	Test sample	Found	% recovery
Intraday	10	10.00	100.00	10	9.99	99.90
	8	7.96	99.50	8	7.95	99.38
	6	5.99	99.93	6	5.98	99.67
Mean ± SD	99.81 ± 0.27			99.65 ± 0.26
n	3			3
SE%^∗∗	0.16			0.15
RSD%	0.27			0.26
Interday	10	9.99	99.90	10	9.95	99.50
	8	7.94	99.25	8	7.94	99.25
	6	6.00	100.00	6	5.98	99.67
Mean ± SD	99.72 ± 0.41			99.47 ± 0.21
n	3			3
SE%^∗∗	0.24			0.12
RSD%	0.41			0.21

SE (% Error) = %RSD/√n.