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

Table 4

The results of the MTF determination in bulk powder using MTF-PT, MTF-PT-Al₂O₃NP-modified, and MTF-PT-NiONP-modified sensors.

	MTF-PT conventional sensor			MTF-PT-Al2O3NP-modified sensor			MTF-PT-NiONP-modified sensor
	Test solution	Found	% recovery	Test solution	Found	%Recovery	Test solution	Found	% recovery
Statistical analysis	6	5.99	99.83	10	9.96	99.60	10	9.95	99.50
	5	4.96	99.20	8	7.99	99.87	8	7.96	99.50
	4.3	4.20	97.76	6	5.98	99.66	6	5.94	99.00
	4	3.97	99.25	4	4.00	100.00	4	3.99	99.75
	3	2.96	98.67	3	2.97	99.00	3	2.97	99.00
	2	1.97	98.50	2	1.99	99.50	2	2.00	100.00
Mean ± SD	98.87 ± 0.72			99.60 ± 0.34			99.45 ± 0.40
n	6			6			6
Variance	0.52			0.12			0.16
% SE	0.29			0.14			0.16
% RSD	0.73			0.34			0.40

Test and found solutions −log conc. (mol L⁻¹) SE (% Error) = %RSD/√n.