In the present group, analytical technics and devices which are useful to ensure reliability of elemental analyses are developing. Co-development of analytical devises with private companies are also carried out. Currently, we are working on the following research themes.

- Development of new primary measurement cell for electrolytic conductivity lower than1 mS/m
Electrolytic conductivity (EC) is utilized for evaluation of water quality in wide industrial field. EC of purer water (below 0.01 S/m), which is lower than tap water, is considered to be in high demand for measurement. NMIJ has a primary measurement cell, "Jones-type cell", which is suitable for measuring EC above 0.01 S/m; however, NMIJ does not have a measurement method for EC lower than 0.01 S/m with SI traceability. In order to break down the current situation, we are trying to develop new primary measurement cell with SI tracability, specialized for the measurement of EC lower than 1 mS/m.

- Development of Analytical Systems for the Characterization of Nanoparticles by Single Particle ICP-MS
Single particle ICP-MS (spICP-MS) is a relatively new technique that enables determination of the particle number concentration and size of metal-based nanoparticles (NPs). It has been being widely used as a tool for the characterization of NPs in various NP-containing products, investigation of NP behavior in the environment, and so on. We are developing analytical systems (such as novel sample introduction systems) to provide more reliable and simple measurement of the particle number concentration and size of NPs by spICP-MS.