| Texto completo | |
| Autor(es): |
Silvaa, Tiago Varao
[1]
;
Miranda, Kelber
[1]
;
Ferreira, Edilene Cristina
[1]
;
Santos, Mirian Cristina
[1]
;
Gomes Neto, Jose Anchieta
[1]
;
Barbosa, Jr., Fernando
[2]
Número total de Autores: 6
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Paulista, Dept Analyt Chem, BR-14800060 Araraquara, SP - Brazil
[2] Univ Sao Paulo, Fac Pharmaceut Sci Ribeirao Preto, BR-14040903 Ribeirao Preto, SP - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ATOMIC SPECTROSCOPY; v. 36, n. 4, p. 182-186, JUL-AUG 2015. |
| Citações Web of Science: | 4 |
| Resumo | |
Lead sulfate and lead stearate are commonly used as additives or stabilizers to protect plastic material from chemical degradation. Moreover, lead chromate is used in pigments. Considering that the presence of Pb in plastic material used for food and beverage packaging may cause deleterious effects to the human body, a simple and fast analytical method for Pb monitoring in plastic food packaging is proposed. Direct solid sampling high-resolution continuum source graphite furnace atomic absorption spectrometry (DSS HR-CS GFAAS) was used as the analytical technique and calibration against aqueous standards was employed. A mixture of Pd(NO3)(2) and Mg(NO3)(2) was used as the chemical modifier. The developed method was applied to different plastic containers. For comparison, some samples were also analyzed by inductively coupled plasma mass spectrometry (ICP-MS). The concentration of Pb in the evaluated samples varied from 16 to 793 mu g kg(-1). A paired t-test at a 95% confidence level showed that the DSS BR-CS GFAAS method provided similar results as those obtained by ICP-MS. The proposed method resulted in a characteristic mass of 5.0 pg of Pb and a limit of detection of 4.9 mu g kg(-1). The relative standard deviation ranged from 2.7 to 18.8% for the determinations by DSS BR-CS GFAAS and from 2.1 to 13.3% when using ICP-MS. (AU) | |
| Processo FAPESP: | 14/12595-1 - Avaliação da amostragem direta de sólidos aliada a espectrometria de absorção atômica com fonte contínua e de alta resolução em análises químicas de amostras de difícil solubilização |
| Beneficiário: | José Anchieta Gomes Neto |
| Modalidade de apoio: | Auxílio à Pesquisa - Regular |