Possibilities of High Resolution Inductively Coupled Plasma Optical Emission Spectrometry in the Determination of Trace Elements in Environmental Materials

Table 4

Content of Zn, Sb, Cd, Cu, Mn, Pb, Cr, U, and Ba (in μg g⁻¹) obtained by JY ULTIMA 2 in the analysis certified reference material IAEA/Soil 7 by both procedures with aqua regia [27] (column 2) and with (HCl–HNO₃–HF) [28] (column 5): mean values 𝑋 for (𝑛 = 4 replicates) and the confidence interval of the mean value Δ𝑋 for statistical confidence 𝑃=95% and 𝑓=𝑛−1=3 (columns 2 and 4) and relative standard deviations (RSD %) (columns 3 and 5), and certified values (column 6).

Selected prominent lines, 𝜆, nm	Procedure with aqua regia		Procedure with (HCl–HNO3–HF)		Certified values. Concentration in (μg g^−1)
	Concentration in (μg g^−1) 𝑋±Δ𝑋	RSD %	Concentration in (μg g^−1) 𝑋±Δ𝑋	RSD %
Zn II 202.548	103.00±1.4	1.4	104.00±1.4	1.4	104
Sb I 206.838	1.65±0.05	3.0	1.72±0.04	2.3	1.7
Cd II 214.438*	1.27±0.06	4.7	1.30±0.06	4.7	1.3^∗
Cu I 324.754	11.00±0.4	3.6	10.60±0.4	3.8	11.0
Mn II 257.610	632.80±13	2.0	627.60±13.0	2.0	631
Pb II 220.353	59.80±1.2	2.0	60.00±1.0	1.7	60.0
Cr II 267.716	59.00±1.6	2.6	58.00±1.8	3.1	60.0
U II 409.014	2.62±0.1	3.8	2.56±0.1	3.9	2.6
Ba II 455.403*	162.00±5.0	3.0	162.00±5.0	3.0	159^∗

∗Noncertified information value.