Are there feasible strategies for determining bromine and iodine in human hair using interference-free plasma based-techniques?
Anal Chim Acta
; 1060: 45-52, 2019 Jul 04.
Article
em En
| MEDLINE
| ID: mdl-30902330
An effective analytical method for bromine and iodine determination in human hair using interference-free inductively coupled plasma mass spectrometry (ICP-MS) was developed. Human hair was digested based on combustion reaction to obtain compatible solutions with ICP-MS analysis. Using microwave-induced combustion (MIC), masses of human hair ranging from 50 to 300â¯mg were efficiently digested. Only a diluted alkaline solution (100â¯mmolâ¯L-1â¯NH4OH) was used for the absorption of both analytes, which was fully compatible with ICP-MS analysis. Using these conditions low limits of detection were obtained (LOD of 0.01⯵gâ¯g-1 for Br and 0.004⯵gâ¯g-1 for I). Recovery tests at two levels (50% and 100%) using a standard solution or mixtures of the sample with certified reference materials (CRMs) were carried out to evaluate the suitability of proposed method and recoveries between 94% and 102% were always obtained. Accuracy was evaluated by analysis of a human hair CRM, and the Br and I concentrations obtained by the proposed method did not differ significantly from those described in the certificate. Repeatability (RSDsâ¯≤â¯4%) and reproducibility (RSDsâ¯≤â¯7%) of the results using proposed method were always very suitable. The digests obtained using the MIC method were fully compatible with ICP-MS and the interferences currently found using conventional digestion methods were completely eliminated. Ultra-trace concentrations of Br and I were determined in human hair, demonstrating that the proposed method is a suitable strategy, and it presents several advantages compared to others published in the literature.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Bromo
/
Cabelo
/
Iodo
Limite:
Humans
Idioma:
En
Revista:
Anal Chim Acta
Ano de publicação:
2019
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Holanda