Use of Functionalized Resin for Matrix Separation and Trace Elements Determination in Petroleum Produced Formation Water by Inductively Coupled Plasma Mass Spectrometry

Table 4

Results for two certificated reference materials of waters (μg L⁻¹, 𝑁=3).

Analyte	SLEW-3 (NRCC)		SLRS-4 (NRCC)
	Certified	Obtained	Certified	Obtained
Co	0.042±0.010	0.041±0.004	0.033±0.006	0.032±0.003
Cd	0.048±0.004	0.047±0.001	0.012±0.002	< 0.014
Pb	0.0090±0.0014	<0.010	0.086±0.007	0.083±0.004
Cu	1.55±0.12	1.59±0.06	1.81±0.08	1.74±0.038
Ni	1.23±0.07	1.29±0.05	0.67±0.08	0.62±0.066