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CO2与盐溶液综合作用对铅丹变色的影响

DOI: 10.11903/1002.6495.2013.137, PP. 159-162

Keywords: 敦煌壁画,铅丹,变色,,CO2

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Abstract:

在25℃下,将铅丹分别浸泡在NaCl,Na2SO4,混合盐溶液以及去离子水中,并对暴露在空气中的CO2及通入自制CO2的结果进行比较。颜色空间坐标L,a,b的变化结果表明,铅丹在Na2SO4溶液中变色最明显,其次是在水中,再次是在NaCl溶液中,变色最不明显的是在混合盐溶液中。且通入CO2时铅丹的变色速率明显高于不通入CO2时,28d后色差数值最大相差超过2倍。XRD分析结果表明,无论是否通入CO2,铅丹经浸泡后的组成都由Pb3O4转变为PbCO3和PbO2。

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