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Titre du document / Document title

Comparison between ordinary least squares regression and weighted least squares regression in the calibration of metals present in human milk determined by ICP-OES

Auteur(s) / Author(s)

NASCIMENTO Rosilene S. (1) ; FROES Roberta E. S. (2) ; E SILVA Nilton O. C. (2) ; NAVEIRA Rita L. P. (2) ; MENDES Denise B. C. (3) ; NETO Waldomiro B. (1) ; SILVA Jose Bento B. (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Departamento de Química. Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, MG, BRESIL
(2) Fundação Ezequiel Diaz, FUNED, Belo Horizonte, MG, BRESIL
(3) Maternidade Odete Valadares, Belo Horizonte, MG, BRESIL

Résumé / Abstract

In this study we compared the use of ordinary least squares and weighted least squares in the calibration of the method for analyzing essential and toxic metals present in human milk by ICP-OES, in order to avoid systematic errors in the measurements used. Human milk samples were provided by maternity clinic Odete Valadares and digested by means of a high-performance microwave (MW) oven. Evaluation of plasma short and long-term stability was made using a solution of digested milk ( 1:50) with 2.0 mg L-1 Mg in HN03 2% (v/v). The detection power resulted to be at or below the μg L-1 level, whilst the precision expressed as relative standard deviation R.S.D. was almost always equal to or better than 3.3%. Certified reference material Infant Formula (NIST SRM 1846) was used to assess the accuracy of the proposed method, which proved to be accurate and precise. Recovery rates were in the range of 83-117%. Aqueous calibration was carried out for each element under study.

Revue / Journal Title

Talanta    ISSN  0039-9140   CODEN TLNTA2 

Source / Source

2010, vol. 80, no3, pp. 1102-1109 [8 page(s) (article)] (15 ref.)

Langue / Language

Anglais

Editeur / Publisher

Elsevier, Amsterdam, PAYS-BAS  (1958) (Revue)

Mots-clés anglais / English Keywords

Poison

;

Infant formula

;

Human

;

Accuracy

;

Reference material

;

Certified reference material

;

Standard deviation

;

Stability

;

Microwave oven

;

High performance

;

Bias

;

Coupled method

;

Atomic emission spectrometry

;

Inductive coupling plasma spectrometry

;

Metal

;

Calibration

;

Comparative study

;

Mots-clés français / French Keywords

Toxique

;

Lait infantile

;

Homme

;

Précision

;

Matériau référence

;

Matériau référence certifié

;

Ecart type

;

Stabilité

;

Four hyperfréquence

;

Haute performance

;

Erreur systématique

;

Méthode couplée

;

Spectrométrie émission atomique

;

Spectrométrie ICP

;

Métal

;

Etalonnage

;

Etude comparative

;

Mots-clés espagnols / Spanish Keywords

Tóxico

;

Leche infantil

;

Hombre

;

Precisión

;

Material referencia

;

Material estandar

;

Desviación típica

;

Estabilidad

;

Horno hiperfrecuencia

;

Alto rendimiento

;

Error sistemático

;

Método acoplado

;

Espectrometría emisión atómica

;

Espectrometría ICP

;

Metal

;

Contraste

;

Estudio comparativo

;

Mots-clés d'auteur / Author Keywords

Ordinary Least squares regression

;

Weighted least squares regression

;

Heteroscedasticity

;

Atomic spectroscopy

;

Human milk

;

Localisation / Location

INIST-CNRS, Cote INIST : 9221, 35400018812462.0080

Nº notice refdoc (ud4) : 22379000



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