Problems in the application of the three-step BCR sequential extraction to low amounts of sediments: An alternative validated route

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• 作者：Elena Ciceri ; Barbara Giussani ; Andrea Pozzi ; Carlo Dossi ; S ; ro Recchia
• 关键词：Sediment analysis ; Speciation of metals ; BCR sequential extraction
• 刊名：Talanta
• 出版年：2008
• 出版时间：30 July 2008
• 年：2008
• 卷：76
• 期：3
• 页码：621-626
• 全文大小：454 K

文摘

Poor recoveries are obtained if the BCR three-step sequential extraction is applied to 100 mg specimens rather than to 1 g. It is observed that analytes are lost during each phase separation which is carried out via centrifugation and can be hardly quantitatively performed on 100 mg sediment specimens. An alternative procedure, which is carried out on a single empty SPE column and involves separation by filtration, is developed to solve this problem. The proposed method is validated on 100 mg samples of certified sediment (BCR-701), but could be potentially used for even lower sediment specimens. Problems related to pH stability during step 2 and its influence on recoveries is also reported.