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中文摘要：
在磷酸介质中,金能阻抑溴酸钾氧化偶氮荧光桃红的褪色反应,据此建立了一种测定痕量金的新方法.探讨了该阻抑褪色反应的最佳反应条件并测定了动力学参数.结果表明,金的质量浓度在2.00～20.0 μg/L范围与阻抑反应和非阻抑反应的吸光度差（△A）有良好的线性关系,线性相关系数为0.997 8,方法的检出限为5.74×10-7g/L.测得反应速率常数为1.60×10-3/s,表观活化能为202.91 kJ/mol.方法用于金矿石标准物质中金的测定,测定值与认定值一致,相对标准偏差（RSD,n=6）小于2.5％,加标回收率为98％～～106％.
英文摘要：
In phosphorus acid,gold could inhibit the fading reaction of azophloxine oxidized by potassium bromate.According to this principle,a new method was established for the determination of trace gold.The optimum reaction conditions and kinetic parameters were investigated for this inhibitory fading reaction.The results showed the mass concentration of gold within the range of 2.00～20.0 μg/L had an excellent linear relationship with the absorbance difference （△A） between inhibitory reaction and non inhibitory reaction.The linear correlation coefficient was 0.997 8 and the detection limit was 5.74×10 7 g/L.The reaction rate constant was 1.60×10 3 /s and the apparent activation energy was 202.91 kJ/mol.When the method was applied in determination of gold in gold ore certified reference materials,the results were consistent with the certified values.The relative standard deviations （RSD,n =6） were less than 2.5％ and the recoveries were 98％-106％.
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