【摘要】 对硫酸亚铁铵-硫酸高铁铵溶液和氢醌溶液分别进行了从溶液配制、仪器测量和结果重复性3方面不确定度来源分析,确立了数学模型,综合评定了2者的合成标准不确定度和扩展不确定度.结果表明,氢醌溶液中,邻苯二甲酸氢钾缓冲溶液和磷酸盐缓冲溶液的合成标准不确定度分别为4.20mV和2.76mV,扩展不确定度分别为8.40mV和5.52mV(近似95%置信概率),都小于硫酸亚铁铵-硫酸高铁铵溶液的合成标准不确定度6.49mV和扩展不确定度12.98mV(近似95%置信概率).说明氢醌溶液电位值的测量结果更可信,精确度更高,应广泛作为测定氧化还原电位仪器的标准溶液来使用.更多还原

【Abstract】 Two Oxidation-Reduction Potential standard solutions are the foundation and the key that a potentiometer canmeasureORP accurately and steadily. Therefore, sources of uncertainty were analyzed in preparation of standard solutions、measurement using precision potentiometer and repeatability for ammonium ferrous sulphate-ferric ammonium sulfate solution and hydroquinone solution(included potassium hydrogen phthalate buffer solution and phosphate buffer solution), respectively. M athematicalmodelwas established, and the two combined standard uncertainty and expanded uncertainty were assessed synthetically. The results showed that combined standard uncertainty and expanded uncertainty of potassium hydrogen phthalate buffer solution and phosphate buffer solution are 4. 20 and 2. 76mV, 8. 40 and 5. 52 mV(approximate 95% confidence level), which both are less than the values of ammonium ferrous sulphate-ferric ammonium sulfate solution. The measurement results of hydroquinone solution potentialvalues aremore credible, more accurate, andmorewidely used as standard solution for potentiometers.更多还原