Sequential injection system in flame atomic absorption spectrometry for the determination of calcium and magnesium in mineral waters

• Type: Article in International Scientific Journal
• Date: 1998

Authors

Araujo, AN (Author) FFUP; Costa, RCC (Author) Other; Lima, JLFC (Author) FFUP; Reis, BF (Author) Other

Journal

Title: Analytica Chimica Acta

Vol. 358

Pages: 111-119

ISSN: 0003-2670

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 53 Citations

Scopus - 53 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-001-8MW

DOI: 10.1016/s0003-2670(97)00583-7

Abstract (EN): A flow set-up based on sequential injection analysis (SIA) is proposed to increase the versatility and robustness of routine flame atomic absorption analytical methods, Four procedures were selected to allow the determinations of calcium within the ranges of 0.03-10.00 and 0.58-200.00 mg l(-1), and magnesium within 0.03-1.5 and 0.80-50.0 mg l(-1), in mineral waters. The sample aliquots inserted were 70.8 and 12 mu l for calcium and 13 and 12 mu l for magnesium. Moreover the system developed enabled to restrict the consumption of the releasing agent to respectively 142 and 97 mu l in the determinations of calcium and to 26 and 12 mu l in the determinations of magnesium. The results obtained in the analysis of 15 mineral waters were compared with those obtained by the corresponding conventional procedures yielding the equations: [Ca mg l(-1)](SIA)=1.008(+/-0.004)*[Ca mg l(-1)](conv.) -0.3 (+/-0.3) and [Mg mg l(-1)](SIA)=0.992(+/-0.006)*[Mg mg l(-1)](conv.) +0.0 (+/-0.1). In all cases the sampling rates achieved were higher than 110 h(-1), and reproducibility being better than 3%. (C) 1998 Elsevier Science B.V.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 9