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我们发现,在酸性溶液中,Au(SCN)_4~ˉ络离子中的Au(Ⅲ)可被AsH_3还原成红色金胶,若加有保护剂,可使金溶胶稳定而能进行光度测定,砷含量在0-10μg范围内有良好线性关系。这一测定可在水相中进行,方法稳定,灵敏度高,干扰少,能避免目前通用的AgDDC法要使用吡啶或氯仿等有机溶剂的缺点。本法用于测定河水样,结果满意。1952年Mokranjac等曾利用AuCl_3与AsH_3在纸上反应生成紫斑检定砷,然而至今未见有金胶光度法的报道。
We found that Au (Ⅲ) in Au (SCN) 4 ~ ˉ complex ions can be reduced to As red Au colloid in Au (SCN) 4 ~ ˉanion in acid solution. If a protective agent is added, the gold colloids can be stabilized and photometry can be carried out. There is a good linear relationship between the content of 0-10μg. This determination can be carried out in the aqueous phase, the method is stable, high sensitivity and less interference, to avoid the disadvantages of the common AgDDC method using organic solvents such as pyridine or chloroform. This method is used to determine river water samples with satisfactory results. In 1952, Mokranjac et al. Used AuCl_3 and AsH_3 to react with purple to produce arsenic in paper. However, no gold colloidal method has been reported so far.