Five types of extraction for the mud samples, i.e. by pure water, hot water, tap water, acid water and oxidation water, are conducted for determined the heavy metals containment.

• 在泥浆溶出方面，利用纯水溶出、加热溶出、自来水溶出、酸溶出、氧化溶出五种溶出方式后抽取上层液进行元素分析。