Analytical Sciences

Abstract − Analytical Sciences, 27(9), 953 (2011).

New Determination Methods of Halides and Cyanide Ions by Electrospray Ionization Mass Spectrometry Based on Ternary Complex Formation
Hiroki HOTTA,* Shota KURIHARA,** Keita JOHNO,** Masaomi KITAZUME,** Kiichi SATO,** and Kin-Ichi TSUNODA**
*Department of Chemistry, Nara University of Education, Takabatake, Nara 630-8528, Japan
**Department of Chemistry and Chemical Biology, Gunma University, Kiryu 376-8515, Japan
Determination methods of halide ions (X = F, Cl, Br and I) by electrospray ionization mass spectrometry (ESIMS) were developed, where negative ions of the ternary complexes of group-13 elements, nitrilotriacetic acid (NTA), and halides were measured. In particular, these halides were simultaneously determined by measuring [InX(nta)], and the limits of detection (LODs) were 1.1 μmol dm−3 for F, 0.32 μmol dm−3 for Cl, 3.8 nmol dm−3 for Br, and 1.6 nmol dm−3 for I, respectively. This approach was extended to the determination of CN, where the ternary complex of CuII, CN and 4-(2-pyridylazo)resorcinol (PAR), i.e., [63CuII(CN)(par)] (m/z 302) was measured. The LOD for CN was 20 nmol dm−3.