Chiba Prefecture is located in the east of Tokyo Metropolis. A large scale development of industrial and residential areas began in the late 1950s until then th
Quantity of trace arsenic in grain and soil was determined by hydride nondispersive atomic fluorescence method.Optimum conditions of measurement were selected i
China is not abandantly supplied with freshwater. Water shortage is a crucial problem in northern China, and affects the development of economy and causes a hos