中文摘要：

为了查明成都金沙出土古象牙赋存的物理化学条件，为其有效保护提供科学依据，对古象牙赋存环境（土壤）的物相、化学成分、pH值和Eh值进行了测试分析，并与古象牙的pH值、Eh值等特征进行了对比分析，结果表明：古象牙赋存土壤样品主要由粘土及硅酸盐矿物组成，其中蒙脱石、伊利石、绿泥石等粘土矿物含量达43％～60％，其pH值和Eh值的平均值分别为6．5和-13．5mV，这种弱酸性还原环境的形成与土壤中含有0．3％左右的腐殖酸有着密切的关系。由于成都金沙古象牙pH和Eh值平均分别为6．46和-15．5mV，与土壤pH和Eh值非常接近；并由于土壤中蒙脱石等粘土矿物的封闭作用，能够阻止古象牙与外部环境的物质交换及其对古象牙侵蚀作用，使古象牙能够在一种相对平衡的条件下得以长期保存。

英文摘要：

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 and -13.5 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.