Development and Validation of an Analytical Method for Determination of Al, Ca, Cd, Fe, Mg and P in Calcium-Rich Materials by ICP OES

Four procedures based on closed-vessel microwave-assisted wet digestion with different oxidative reagents, including HNO 3 (P1), HNO 3 + H 2 O 2 (P2), aqua regia (P3) and Lefort aqua regia (P4), for preparation of calcium (Ca)-rich materials prior to determination of total concentrations of Al, Ca,...

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Bibliographic Details
Published in:Molecules
Main Authors: Anna Szymczycha-Madeja, Maja Welna, Monika Zabłocka-Malicka, Pawel Pohl, Włodzimierz Szczepaniak
Format: Article in Journal/Newspaper
Language:English
Published: MDPI AG 2021
Subjects:
calcium-rich materials
sample preparation
multi-element analysis
validation
ICP OES
Organic chemistry
QD241-441
Kola Peninsula
kola peninsula
Online Access:https://doi.org/10.3390/molecules26206269
https://doaj.org/article/6ba84f48d8ef493c985a85d1eee3e104
Description
Summary:Four procedures based on closed-vessel microwave-assisted wet digestion with different oxidative reagents, including HNO 3 (P1), HNO 3 + H 2 O 2 (P2), aqua regia (P3) and Lefort aqua regia (P4), for preparation of calcium (Ca)-rich materials prior to determination of total concentrations of Al, Ca, Cd, Fe, Mg and P by inductively coupled optical emission spectrometry (ICP OES) were compared. It was found that digestion with Lefort aqua regia (P4) provided the best results for all examined elements, i.e., precision of 0.30–4.4%, trueness better than 2%, recoveries of added elements between 99.5–101.9%, and limits of detection within 0.08–1.8 ng g −1 . Reliability of this procedure was verified by analysis of relevant certified reference materials (CRMs), i.e., Natural Moroccan Phosphate Rock—Phosphorite (BCR-O32). Additionally, selection of appropriate analytical lines for measurements of element concentrations, linear dynamic ranges of calibration curves and matrix effects on the analyte response were extensively investigated. Finally, the selected procedure was successfully applied for routine analysis of other Ca-rich materials, i.e., CRMs such as NIST 1400 (Bone Ash), CTA-AC-1 (Apatite Concentrate Kola Peninsula) and NCS DC70308 (Carbonate Rock), and six natural samples, such as a dolomite, a phosphate rock, an enriched superphosphate fertilizer, pork bones, pork bones after incineration, and after steam gasification.

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