通过对平湖糟蛋样品前处理方式以及乙醇测定反应体系的优化,建立了重铬酸钾分光光度法测定平湖糟蛋中乙醇含量的方法。平湖糟蛋样品中的乙醇经蒸馏法充分提取,提取液在5.0mL重铬酸钾溶液(50g/L)和2.5mL硫酸溶液(50∶50,v/v)介质中于100...通过对平湖糟蛋样品前处理方式以及乙醇测定反应体系的优化,建立了重铬酸钾分光光度法测定平湖糟蛋中乙醇含量的方法。平湖糟蛋样品中的乙醇经蒸馏法充分提取,提取液在5.0mL重铬酸钾溶液(50g/L)和2.5mL硫酸溶液(50∶50,v/v)介质中于100℃水浴反应15min,恢复室温后采用分光光度法在585nm处测定吸光度值。该方法能较好排除基质效应影响,测定结果准确度高,乙醇含量在0.00~250.00g/kg范围内线性关系良好,相关系数大于0.999,加标回收率为96.2%~99.5%,精密度(relative standard deviation,RSD)为0.69%~2.28%。该方法操作简单、准确度高、回收率好,能准确地对糟蛋样品中乙醇进行定量检测。展开更多
FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increas...FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increasing the concentration of (NH 4) 2MoO 4.And other ions had no effect on determination.The linear breadth was 4～8mg/100ml P 2O 5,RSD≤5%,RE≤5%.The method had the advantages of rapidness、simplicity and accuracy.展开更多
文摘通过对平湖糟蛋样品前处理方式以及乙醇测定反应体系的优化,建立了重铬酸钾分光光度法测定平湖糟蛋中乙醇含量的方法。平湖糟蛋样品中的乙醇经蒸馏法充分提取,提取液在5.0mL重铬酸钾溶液(50g/L)和2.5mL硫酸溶液(50∶50,v/v)介质中于100℃水浴反应15min,恢复室温后采用分光光度法在585nm处测定吸光度值。该方法能较好排除基质效应影响,测定结果准确度高,乙醇含量在0.00~250.00g/kg范围内线性关系良好,相关系数大于0.999,加标回收率为96.2%~99.5%,精密度(relative standard deviation,RSD)为0.69%~2.28%。该方法操作简单、准确度高、回收率好,能准确地对糟蛋样品中乙醇进行定量检测。
文摘FIA spectrophotometry was studied to analyse the content of phosphorus in phosphorous composite fertilizer.NH 4VO 3 (NH 4) 2MoO 4 developing agent was used as carrier.The interference of EDTA was eliminated by increasing the concentration of (NH 4) 2MoO 4.And other ions had no effect on determination.The linear breadth was 4～8mg/100ml P 2O 5,RSD≤5%,RE≤5%.The method had the advantages of rapidness、simplicity and accuracy.
