Inflnence of PH on Chemical Forms of Phosphate Ad－sorbed on Goethite Snrfaces

Chemical forms of the phosphate adsorbed on goethite surfaces and characteristics of the coordinategroups which exchange with P on goethite surfaces in solutions with different pll values were investigated.Results showed that the chemical forms of P on goethite surfaces changed from the dominance of monodentatecorrdination to that of bidentate one with increasing pH of the solution. By influencing types of phosphateions in solutions, pH affected the chemical forms of P on goethite surfaces. The amount of OH￣- displacedby phosphate on goethite surfaces was the most at pH 7.0, the second at pH 9.0, and the least at pH 4.5.

泉州湾宋代海船低氧控湿保存实验研究

泉州湾宋代海船船体中含有大量的盐分与铁钉是船体难以长期稳定保存的关键内因,而开放式不稳定的保存环境是船体病害产生与发展主要外因,因此,针对泉州宋船特殊的保存状况,拟采用"低氧控湿保存"的方式进行预防性保护。通过开展低氧控湿环境中铁的腐蚀、硫化物氧化以及木材稳定性等一系列实验,发现低氧保存对于氧化反应有一定的抑制作用,但在低氧保存环境中含有水分的情况下,对于不需要氧气参与的金属铁的电化学反应不但不能起到抑制作用,反而加快了腐蚀反应;低氧控湿环境保存在保持木材的化学稳定性方面没有优势。