Thiourea declines the absorbency of gold while sulfuric acid plays a contrary role.The determined value were sati-sfactor after being modified by the blank curve.

• 硫脲使金的吸光度减少,硫酸使金的吸光度增加,经过空白曲线修正后可用作实际样品的分析,简化分析步骤。