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Satsumasendai, Japan

Kobayashi A.,Tohoku University | Kobayashi A.,Tohoku Ryokka Kannkyohozen Company | Kubo T.,Kyoto University | Sato T.,Tohoku Ryokka Kannkyohozen Company | And 6 more authors.
Analytical Methods | Year: 2013

We studied an efficient analytical method for detecting brominated aromatic compounds using negative ion chemical ionization (NICI), with well-known quadruple gas-chromatography mass-spectrometry (GC/MS). We utilized 79 and 35 m/z as monitoring ions of brominated compounds and syringe-spiked PCB#209, thus highly selective and sensitive detection was achieved. With 7.0 m long HP-5 GC column, decabromo-diphenyl ether (DBDE), hexabromobenzene, α-hexabromo cyclododecane (α-HBCD), and tetrabromo bisphenol A were utilized as bromine type flame retardants that are generally consumed in industrial commodities. A shorter column provided more efficient results without degradation of DBDE on GC which are usually observed with longer column (30 m). Also, pseudo environmental water samples can be analyzed without authentic pretreatment procedures. Furthermore, we demonstrated analyses for members regulated by the Restriction of Hazardous Substances. Consequently, the newly developed simple NICI-GC/MS method was effectively worked for screening of flame retardants in a short period of time. © 2013 The Royal Society of Chemistry. Source


Kobayashi A.,Tohoku University | Kobayashi A.,Tohoku Ryokka Kannkyohozen Company | Kitahara Y.,Tohoku Ryokka Kannkyohozen Company | Toyota K.,Tohoku Ryokka Kannkyohozen Company | And 3 more authors.
Analytical Methods | Year: 2012

We report problems and improvements of a regulated analytical GC method supported by ISO/DIS 24293 for nonyl phenol isomers (NPs). The variations of peak area and recovery of NPs were found on a regulated GC method which 4-n-nonyl phenol-2,3,5,6-d4 (4-np-d) and phenanthrene-d10 (fnt-d) were utilized as surrogate compounds with syringe spiking. Furthermore, we investigated the relative recovery by the continuous injection of NPs, 4-np-d, and fnt-d, then the decrease rate of peak area of each compound was different although all peaks were gradually decreased. Consequently, the decrease rates of NPs and 4-np-d were higher, and the relative recovery of NPs were also decreased. After cutting off the GC column (about 50 cm) and replacement of an injection insert, the peak areas of compounds were completely recovered. Therefore, we anticipate that the problem was caused by adsorption or degradation of NPs in the inlet area. Additionally, a similar decrease of peak area was observed on the pretreated real samples by the effect of matrix. © 2012 The Royal Society of Chemistry. Source

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