| Budget Amount *help |
¥27,170,000 (Direct Cost: ¥20,900,000、Indirect Cost: ¥6,270,000)
Fiscal Year 2014: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2013: ¥6,110,000 (Direct Cost: ¥4,700,000、Indirect Cost: ¥1,410,000)
Fiscal Year 2012: ¥12,090,000 (Direct Cost: ¥9,300,000、Indirect Cost: ¥2,790,000)
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| Outline of Final Research Achievements |
We obtained samples of four NPEFs that were contaminated with the synthetic pyrethroid cypermethrin, and we used GC/IRMS to determine the stable carbon isotope ratios (δ13C) for the cypermethrin in the four NPEF samples, as well as in ten cypermethrin reagents and two commercial pesticide formulations. The δ13C values (± standard deviation) of the 16 cypermethrin samples ranged from -28.3 ± 0.2‰ to -24.5 ± 0.2‰. The four NPEFs showed similar δ13C values (-26.8‰ to -27.3‰), suggesting that the cypermethrin in all the samples came from the same source (either the same chemical reaction or the same primary material).
In addition, we analysed δ13C of 5 pesticides, 6 sugar, 10 amino acid and 2 caffeine samples using direct injection mode and online LC/IRMS mode. In this study, the ion chromatography system was coupled with IRMS instrument.
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