Sample preparation of lipstick for further Cd and Pb determination by ICP-MS: is the use of complexing acids really necessary?

Autor: Marcia F. Mesko, Filipe Soares Rondan, Diogo La Rosa Novo, Rodrigo Mendes Pereira, Vanize Caldeira Costa
Rok vydání: 2017
Předmět:
Zdroj: Journal of Analytical Atomic Spectrometry. 32:1780-1788
ISSN: 1364-5544
0267-9477
DOI: 10.1039/c7ja00139h
Popis: In this work, the use of complexing acids (HF and HCl) combined with HNO3 was carefully evaluated for the digestion of several types of lipsticks and further Cd and Pb determination by inductively coupled plasma mass spectrometry (ICP-MS). Creamy, opaque and shimmering lipsticks were digested using HNO3 (6 mL) or a mixture containing HNO3 (6 mL) plus HCl (0.5 or 2 mL) or HNO3 (6 mL) plus HF (2 mL). The results indicate that complexing acids are not required for the subsequent determination of Cd in all types of lipsticks evaluated. On the other hand, complexing acids were essential for ensuring quantitative results for Pb in shimmering lipstick. Thus, by using HNO3 combined with only 0.5 mL of HCl, it was possible to obtain quantitative results for Pb and Cd in lipsticks. Under these conditions, recoveries for Cd and Pb were between 95 and 103%. No statistical difference was observed between the results obtained using the proposed method (HNO3/HCl) and those obtained using HNO3/HF, where a complete dissolution of the lipsticks' inorganic fraction occurred. Moreover, by using HCl, HF was avoided and solutions more compatible with ICP-MS analysis were obtained. The limits of detection for Cd and Pb were 3 and 77 ng g−1, respectively. This method was applied for a variety of lipsticks, and the concentration of Cd and Pb ranged from
Databáze: OpenAIRE
Externí odkaz: