[Content of rare earth elements in wild Hypericum japonicum Thunb].

Rare earth elements are important nutritional elements for human health, and today more and more attention has been paid to the effective components in Chinese traditional medicine, especially to rare earth elements. Fifteen rare earth elements in wild hypericum japonicum Thunb were analyzed by the methods of ICP-MS. The results showed that the concentrations of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb, Tm, Lu and Y ranged from 6 ng x g(-1) x DW to 14 522 ng x g(-1) x DW, and among them the concentrations of La, Ce and Nd were higher than 2 000 ng x g(-1) x DW. Compared with the concentration of rare earth elements in rice, corn, wheat and barley, the total concentration of rare earth elements in hypericum japonicum Thunb was much higher, which could be the mechanism of curative effect of hypericum japonicum Thunb on liverish diseases. The character of elements and the content of rare earth elements in soil should be responsible for the difference, but the distributive mechanism of rare earth elements in hypericum japonicum Thunb should be further studied.

[Determination of major elements in soil from cancer village by X-ray fluorescence spectrometry].

Many social problems arise from environmental pollution, cancer village is one of the many important problems caused by pollution. The authors selected a typical cancer village where 80-100 people died of cancer in the last five years, but there are only a total of 1 200 people in this village. The authors sampled soils from crops-planted areas and detected the major elements by X-ray fluorescence spectrometry. The results showed that the contents of SiO2, TiO2, Al2O3, Fe2O3, MnO, MgO, CaO, Na2O, K2O and P2O5 in soil of this village were 66.05%, 0.66%, 11.37%, 3.93%, 0.075%, 1.97%, 5.47%, 1.90%, 2.11% and 0.20% respectively; with the precision being +/- 0.20%, +/- 0.005%, +/- 0.10%, +/- 0.10%, +/- 0.005%, +/- 0.05%, +/- 0.04%, +/- 0.08%, +/- 0.02% and +/- 0.005% respectively, which showed that X-ray fluorescence spectrometry is a good method.

[Effects of hair dyeing on the heavy metals content in hair].

Cosmetic and hair dye has been one of the pollution resources of heavy metals. Contents of heavy metals in hair of dyed group and non-dyed group were analyzed by ICP-MS, the results showed that dyeing hair can change the content of heavy metals in hair, but the degree of effect is different for different element: contents of Mn, Fe, Ni, Cu, Cd and Sb in hair of dyed group were higher than that of non-dyed group, but contents of As, Cr, Zn, Ag, Pb and Hg were lower. The cause of the above results could be that hair dye contains more Mn, Fe, Ni, Cu, Cd and Sb, but less As, Cr, Zn, Ag, Pb and Hg, and dyeing hair could restrain the metabolism and excretion of As, Cr, Zn, Ag, Pb and Hg from human body.

[Application of ICP-MS to detect rare elements in wild Cistanche deserticola Y. C. Ma].

Rare metals are important nutritional elements for human health. Fifteen rare metals in wild Cistanche deserticola Y. C. Ma were analyzed by the methods of ICP-MS. The results showed that concentrations of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Yb and Lu in Wild Cistanche deserticola Y. C. Ma were 144.89, 259.75, 36.41, 133.25, 25.38, 6.10, 30.20, 3.85, 20.36, 3.42, 8.55, 6.42, 1.15, 20.02 and 29.77 ng x g(-1) respectively, the character of elements and the content of rare earth elements in soil should be responsible for the difference, but the mechanism of distribution should be further studied.