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Uncertainty estimation in the determination of metals in superficial water by ICP-OES
Autor
FAUSTINO, MAINARA G.
MARQUES, JOYCE R.
MONTEIRO, LUCILENA R.
STELLATO, THAMIRIS B.
SOARES, SABRINA M.V.
SILVA, TATIANE B.S.C.
SILVA, DOUGLAS B. da
PIRES, MARIA A.F.
COTRIM, MARYCEL E.B.
BRAZILIAN CONGRESS ON METROLOGY, 8th
Resumen
From validation studies, it was possible to estimate a measurement uncertainty of
several elements such as Al, Ba, Ca, Cu, Cr, Cd, Fe, Mg, Mn, Ni and K in water samples from
Guarapiranga Dam. These elements were analyzed by optical emission spectrometry with
inductively coupled plasma (ICP-OES). The value of relative estimated uncertainties were
between 3% and 15%. The greatest uncertainty contributions were analytical curve, and the
recovery method, which were related with elements concentrations and the equipment response.
Water samples analyzed were compared with CONAMA Resolution #357/2005.