著者

太田 庸起子 中野 篤浩 松本 理

出版者

The Japanese Society for Hygiene

雑誌

日本衛生学雑誌 (ISSN:00215082)

巻号頁・発行日

vol.47, no.4, pp.811-817, 1992-10-15 (Released:2009-02-17)

参考文献数

19

被引用文献数

4 6

---

The hair from 9 children living in a Keshan disease prevalent district and from 10 children living in a Keshan disease non-prevalent district in China was analyzed. At the same time, the hair from 35 children of the same age residing in Tsukuba district in Japan was analyzed for comparison of the concentration of essential trace elements with that of children living in the Keshan disease prevalent district. Se concentration was determined by a fluorophotometric method and 16 other elements were analyzed by ICP emission spectrometry. Hg was analyzed by the heating evaporation method and by neutron activation analysis. The Se concentration in the hair of children living in the prevalent district was very low, being one-tenth that of the Japanese. The Ni concentration was particularly low in the prevalent district, and it determined to study more about the effects of Ni deficiency on health. In the prevalent district, Mg and Ca levels were low and those of Pb, Fe, Al, Ti were relatively high. Mn concentrations of both districts in China were very high when compared to the Japanese. The results of this study showed that the low Se concentration in Keshan disease is in agreement with previously reported data. Ecological factors, including nutrition were considered to be important in the etiology of this disease.

著者

太田 庸起子

出版者

公益社団法人日本産業衛生学会

雑誌

産業医学 (ISSN:00471879)

巻号頁・発行日

vol.8, no.5, pp.282-285, 1966-05-20

---

The concentration of mercury in head hair obtained from a man, who is suspected to have been exposed to mercury vapours and inhaled it, was determined by a method of non-destructive activation analysis based on the detection of the 68 Kev X-rays and 77 Kev Gamma-rays of 65-hour ^<197>Hg. About 100 mg of hair, cut to equal length and at the same distance from the scalp at the same part of the head every month for seven months, was washed to be got rid of surface contamination with either a nonionic detergent or organic solvents, followed by rinsing with distilled water. After neutron irradiation of the sample in HTR reactor for 5 hours in a thermal neutron flux of about 1×10^<12>n/cm^2-sec, followed by cooling for 5 days to decrease short-lived contaminating activities, mercury was determined by direct gamma-ray spectrometry. Results from the hair samples showed that the concentration of mercury decreased monotonically from 20.4 ppm to 4.6 ppm. On the other hand, results from samples obtained from a group consisting of seven individuals who had shared similar diets with the man above stated and another group of twelve individuals belonging to the other groups showed a significant difference between the man inhaling mercury vapours and these groups. Namely, the range of the concentration of mercury of these groups was from 1.9 ppm to 6.2 ppm. By the non-destructive activation analysis of head hair, it is able to deal with more cases in a shorter period. Detectable limit is 0.07 ± 0.02μg, and the necessary minimum quantity of hair is enough below 50 mg. It is necessary to care in obtaining hair, because mercury is very tightly bound to the hair and not easily removed by washing.