基于H2SO4介质及四硼酸钠缓冲溶液中,80℃水浴中,Ir(Ⅳ)对KIO4氧化亮绿褪色反应具有阻抑作用,据此建立了阻抑动力学光度法测定痕量Ir(Ⅳ)的新方法。阻抑反应(吸光度A)与非阻抑反应(吸光度A0)吸光度差值△A与Ir(Ⅳ)的质量浓度ρ在0.0002...基于H2SO4介质及四硼酸钠缓冲溶液中,80℃水浴中,Ir(Ⅳ)对KIO4氧化亮绿褪色反应具有阻抑作用,据此建立了阻抑动力学光度法测定痕量Ir(Ⅳ)的新方法。阻抑反应(吸光度A)与非阻抑反应(吸光度A0)吸光度差值△A与Ir(Ⅳ)的质量浓度ρ在0.0002~0.08μg/mL范围内呈良好的线性关系,检出限为2.969×10-10g/mL。对1μg/25 mL Ir(Ⅳ)标准溶液测定的相对标准偏差为1.7%(n=11)。测定了动力学参数,反应对Ir(Ⅳ)为一级反应,试验条件下,总反应为准一级反应,表观速率系数为2.883×10-4/s,表观活化能为52.2 kJ/mol。方法用于分子筛和活性炭样品中痕量Ir(Ⅳ)测定,加标回收率在98.1%~104.9%范围,符合痕量分析要求。展开更多
This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammon...This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammonium salt and quantity (K) of potassium in sample. On the basis of this equation,the use of working curves has been suggested. The results of the experiments indicated that the linear relation between V and K is very good when the quantity of potassium in sample is more than 0.Smg. This method is also suitable for determination of potassium in various salt solution. With the increase of concentration of the salt solution, Which has the same amount of potassium, The volume of quaternary ammonium salt solution decreases regularly. The influence of co-existance and interference ions can be eliminated by using this working curve method.As compared with the original method,this method is not only accurate and precise but also rapid, simple and convenient. It has been tested by the determination of potassium in a sea water sample and the standard deviation is found to be≤±0.001mg/ml.展开更多
文摘基于H2SO4介质及四硼酸钠缓冲溶液中,80℃水浴中,Ir(Ⅳ)对KIO4氧化亮绿褪色反应具有阻抑作用,据此建立了阻抑动力学光度法测定痕量Ir(Ⅳ)的新方法。阻抑反应(吸光度A)与非阻抑反应(吸光度A0)吸光度差值△A与Ir(Ⅳ)的质量浓度ρ在0.0002~0.08μg/mL范围内呈良好的线性关系,检出限为2.969×10-10g/mL。对1μg/25 mL Ir(Ⅳ)标准溶液测定的相对标准偏差为1.7%(n=11)。测定了动力学参数,反应对Ir(Ⅳ)为一级反应,试验条件下,总反应为准一级反应,表观速率系数为2.883×10-4/s,表观活化能为52.2 kJ/mol。方法用于分子筛和活性炭样品中痕量Ir(Ⅳ)测定,加标回收率在98.1%~104.9%范围,符合痕量分析要求。
文摘This paper is based uPon the principles of volumetric method for determination of potassium with sodium tetraphenylboron and quaternary ammonium salt. A linear equation was found between volume (V) of quaternary ammonium salt and quantity (K) of potassium in sample. On the basis of this equation,the use of working curves has been suggested. The results of the experiments indicated that the linear relation between V and K is very good when the quantity of potassium in sample is more than 0.Smg. This method is also suitable for determination of potassium in various salt solution. With the increase of concentration of the salt solution, Which has the same amount of potassium, The volume of quaternary ammonium salt solution decreases regularly. The influence of co-existance and interference ions can be eliminated by using this working curve method.As compared with the original method,this method is not only accurate and precise but also rapid, simple and convenient. It has been tested by the determination of potassium in a sea water sample and the standard deviation is found to be≤±0.001mg/ml.