Basic Physical And Chemic Properties, And Host Environment Of The Ancient Ivory Unearthed From Jinsha, Chengdu, China

In order to provide the scientific basis for effective protection method of the ancient ivory unearthed from Jinsha, Chengdu, China, the basic physical properties, chemic cauterization properties, host environment, microorganism of the ancient ivory unearthed from Jinsha site was measured, calculated and analyzed by SEM, XRD, XRF, TG-DTA and so on which are modern test technology and means. The difference among the ancient ivory unearthed from Jinsha, Chengdu and the fresh Asia ivory were contrasted. Discuss character of ivory's physics and chemistry, and host environment's effect with ivory. The results of research as follows;The saturation density of the lining of fresh ivory is 1.76 g/cm~3 and ancient ivory is 1.76 g/cm . The outer of ancient ivory is 2.00 g/cm , the average of lining of the ancient ivory is 1.645 g/cm~3. The experiments proved that ancient ivory is a material with many holes, the hole ratio of ancient ivory is 57.8~70.0%.The containing water or moisture of fresh ivory is 15.3%, the average of the ancient ivory is 53.77%. The outer of ancient ivory is 31.1%, the lining is 65.1%. When drying at 37℃ in the constant temperature oven, the dehydration ratio of fresh ivory is 12.36% after nine days, and its body is no change, but the ratio of dehydration of ancient ivory is 31.37% after 6 hours, the ancient ivory crazed and pulverized.They easy dissolve acid and hard dissolve alkali which are the ancient ivory unearthed from Jinsha, Chengdu ivory, fresh ivory and savage apatite. Their corrosion data in the 1% hydrochloric acid is 92.69%, 90.9% and 80.02%, but in the 20% sodium hydroxide is 2.79%, 3.14% and 6.12%.The quantity of ache cauterization of the ancient ivory from Jinsha and fresh ivory are higher than the savage apatite, and the quantity of alkali cauterization of the ancient ivory and fresh ivory are lower than the savage apatite. The organic composition of fresh ivory easy response to alkali.Through separated and purified microorganism in the ancient ivory, we have four microorganism. They are aspergillus, penicillium, bacteria and actinomycete. Observed by flat and SEM photography, straightly put up theirs' shape character. They are basic of preventing microorganism for the ancient ivory.Samples of host soil of the ancient ivory are mainly composed of clay minerals and silicate minerals, their pH and Eh average value are 6.5 and —13.5 mV. There is close connection with the formation of weak acid-reduction environment and about 0.3 percent of humic acid in soils. The pH and Eh average value of the ancient ivory are 6.5 and —13.5 mV, they are close to the soil's. This host environment is advantage for protecting the ancient ivory.