| Budget Amount *help |
¥16,510,000 (Direct Cost: ¥12,700,000、Indirect Cost: ¥3,810,000)
Fiscal Year 2017: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2015: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
Fiscal Year 2014: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
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| Outline of Final Research Achievements |
Novel methods for the determination of inorganic oxyanions by electrospray ionization mass spectrometry (ESIMS) have been developed using dehydration reactions between oxyanions and carboxylic acids at the ES interface. Twelve oxyanions (VO3－, CrO42－, MoO42－, WO42－, BO33－, SiO32－, SiO44－, AsO44－, AsO2－, SeO42－, SeO32－ and NO2－), out of 16 tested, reacted with four aminopolycarboxylic acids, i.e., IDA, NTA, CyDTA and TTHA, at the ES interface to produce the dehydration products which gave intense mass ion responses, sufficient for trace analysis. Among them, trace determinations of CrVI and silica in water samples, and AsO44－ and AsO2－ in Hijiki were achieved after on-line ion chromatography (IC). Moreover, a desalter based on electrodialysis was developed and was applied to the on-line desalter/ESIMS system for the determination of SiO44－ and BO33－ in natural water samples.
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