Certification of mono-, di-, and tributyltin compounds in marine sediment certified reference material by species-specific isotope dilution mass spectrometric analysis using synthesized ~(118)Sn-labeled butyltins

摘要

A new marine sediment reference material (NMIJ CRM 7301-a) for butyltins analysis was prepared and certified by the National Metrological Institute of Japan, National Institute of Advanced Industrial Science and Technology (NMIJ/AIST). The original material of the sediment was collected at a bay near industrial activities in Japan. The sediment material was air-dried, sieved, homogenized, and packaged into 1,000 glass bottles (60 g each). Certification of NMIJ CRM 7301-a was carried out at NMIJ using two different types of species-specific isotope dilution mass spectrometry: isotope dilution-ethylation–gas chromatography/inductively coupled plasma mass spectrometry (GC/ICPMS) and isotope dilution–ethylation-gas chromatography/mass spectrometry (GC/MS). A mixture of ~(118)Sn-enriched monobutyltin, dibutyltin, and tributyltin was synthesized in our laboratory and was used as a spike for both techniques. Certified values are given for tributyltin (0.044 ± 0.004 mg kg~(-1) as Sn), dibutyltin (0.056 ± 0.006 mg kg~(-1) as Sn, and monobutyltin (0.058 ± 0.013 mg kg~(-1) as Sn), being at lower levels than currently available sediment CRMs for the analysis of organotins.