Simultaneous Determination of Copper, Lead, and Cadmium at Hexagonal Mesoporous Silica Immobilized Quercetin Modified Carbon Paste Electrode

Table 2

The results for determination of copper, lead, and cadmium in soil sample.

Analyte	Sample	Found (𝑛=6, 𝜇g/g)	Average value (𝜇g/g)	FAAS (𝜇g/g)	RSD (%)
Cu(II)	Soil 1^#	9.76, 10.03, 10.47, 9.88, 10.33, 9.69	10.026	10.064	3.15
	Soil 2^#	24.57, 25.41, 25.67, 24.49, 24.63, 25.36	25.024	24.888	2.14
Pb(II)	Soil 1^#	12.21, 12.67, 12.89, 12.32, 13.01, 12.28	12.563	12.518	2.71
	Soil 2^#	34.29, 34.45, 34.21, 34.17, 34.33, 34.36	34.391	34.299	2.25
Cd(II)	Soil 1^#	1.22, 1.19, 1.14, 1.36, 1.20, 1.38	1.247	1.27	7.73
	Soil 2^#	1.27, 1.26, 1.46, 1.41, 1.36, 1.29	1.342	1.316	6.12