Certification of butyltins and phenyltins in marine sediment certified reference material by species-specific isotope-dilution mass spectrometric analysis using synthesized 118Sn-enriched organotin compoundsReportar como inadecuado




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Analytical and Bioanalytical Chemistry

, Volume 387, Issue 7, pp 2325–2334

First Online: 28 July 2006Received: 02 June 2006Revised: 30 June 2006Accepted: 13 July 2006

Abstract

A new marine sediment certified reference material, NMIJ CRM 7306-a, for butyltin and phenyltin analysis has been prepared and certified by the National Metrological Institute of Japan at the National Institute of Advanced Industrial Science and Technology NMIJ-AIST. Candidate sediment material was collected at a bay near industrial activity in Japan. After air-drying, sieving, and mixing the material was sterilized with γ-ray irradiation. The material was re-mixed and packaged into 250 glass bottles 15 g each and these were stored in a freezer at −30 °C. Certification was performed by use of three different types of species-specific isotope-dilution mass spectrometry SSID–MS—SSID–GC–ICP–MS, SSID–GC–MS, and SSID–LC–ICP–MS, with Sn-enriched organotin compounds synthesized from Sn-enriched metal used as a spike. The Sn-enriched mono-butyltin MBT, dibutyltin DBT, and tributyltin TBT were synthesized as a mixture whereas the Sn-enriched di-phenyltin DPhT and triphenyltin TPhT were synthesized individually. Four different extraction methods, mechanical shaking, ultrasonic, microwave-assisted, and pressurized liquid extraction, were adopted to avoid possible analytical bias caused by non-quantitative extraction and degradation or inter-conversion of analytes in sample preparations. Tropolone was used as chelating agent in all the extraction methods. Certified values are given for TBT 44±3 μg kg as Sn, DBT 51 ± 2 μg kg as Sn, MBT 67 ± 3 μg kg as Sn, TPhT 6.9 ± 1.2 μg kg as Sn, and DPhT 3.4 ± 1.2 μg kg as Sn. These levels are lower than in other sediment CRMs currently available for analysis of organotin compounds.

KeywordsCertification Certified reference material Species-specific isotope dilution Organotin compounds Sediment  Download fulltext PDF



Autor: Kazumi Inagaki - Akiko Takatsu - Takuro Watanabe - Yoshie Aoyagi - Takashi Yarita - Kensaku Okamoto - Koichi Chiba

Fuente: https://link.springer.com/







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