The major components and trace elements in 13 bittern products were measured. The total salt concentration ranged from 26.75% to 31.31%, showing little difference between bittern samples. However, there were large concentration differences of Mg and NaCl between samples. The contents of Mo and B were in proportion to their concentrations in seawater. Some samples also had high concentrations of Zn, Cu, Ni, Fe and Mn, indicating sources other than seawater alone. No difference in quality between bittern samples from deep seawater and other seawater sources was apparent.
