Study on the environment of preserving the ancient ivory unearthed from Chengdu Jinsha site,China

Abstract

In order to understand the physical and chemical conditions of the environment of preserving the ancient ivory unearthed from Chengdu Jinsha site and provide the scientific basis for the effective protection of the ancient ivory,This paper analyzes the phases,chemical constituents,pH and redox potential(Eh) values of the environment of preserving the ancient ivory.Further more,it compares the pH and Eh values between the environment and the ancient ivory.The results show that the soil samples of preserving the ancient ivory are mainly composed of clay minerals and silicate minerals.Among them,the content of montmorillonite,illite and chlorite is 43%～60%,their pH and Eh average value are 6.5 and13.5 mV.There is a close connection with the formation of the weak acid-reduction environment and about 0.3 percent of humic acid in soils.The pH and Eh average value of the ancient ivory from Chengdu Jinsha site are 6.5 and-13.5 mV,they are close to that of the soil.Due to closing effect of clay minerals in the soils can prevent the substance exchange between the ancient ivory and exterior environment as well as their erodent acting to the ancient ivory,the clay minerals can make the ancient ivory to be preserved for a long time in a relatively balance condition.

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