建立臧红T–Fenton试剂荧光光谱法测定一次性纸杯中双酚A含量的方法。在酸性介质中,臧红T能被Fenton试剂产生的羟自由基氧化并引起荧光猝灭,而双酚A可以部分清除羟自由基对臧红T的氧化作用,据此可测定双酚A的含量。对实验条件进行了优化...建立臧红T–Fenton试剂荧光光谱法测定一次性纸杯中双酚A含量的方法。在酸性介质中,臧红T能被Fenton试剂产生的羟自由基氧化并引起荧光猝灭,而双酚A可以部分清除羟自由基对臧红T的氧化作用,据此可测定双酚A的含量。对实验条件进行了优化,在25 mL样品溶液中分别加入1 mL 4.3 mmol/L臧红T溶液、2 mL pH3.5缓冲溶液、1.4 mL 0.88 mmol/L FeSO_4溶液、1 mL 0.01%的H_2O_2溶液。双酚A的质量浓度在0.4～2.4 mg/L范围内与荧光强度具有良好线性关系,线性相关系数r^2=0.997 8,检出限为10μg/L。测定结果的相对标准偏差为1.5%(n=8),加标回收率为97.8%～102.4%。该方法操作简便,测定结果准确可靠,可用于一次性纸杯中双酚A的测定。展开更多
Nessler's reagent spectrophotometry,gas phase molecular absorption spectrometry and ion chromatography were respectively used to determine ammonia nitrogen in surface water.The detection limit,precision,accuracy a...Nessler's reagent spectrophotometry,gas phase molecular absorption spectrometry and ion chromatography were respectively used to determine ammonia nitrogen in surface water.The detection limit,precision,accuracy and recovery rate of the three methods were compared,and the determination results of the actual water samples were analyzed by t test.The results showed that the three methods all could meet the requirement of the laboratory quality control,and there was no significant difference in the determination results.Compared with Nessler's reagent spectrophotometry,the operation of gas phase molecular absorption spectrometry and ion chromatography operation was more convenient and fast and has no pollution,which can be used for the determination of ammonia nitrogen content in a large quantity of surface water samples.展开更多
文摘建立臧红T–Fenton试剂荧光光谱法测定一次性纸杯中双酚A含量的方法。在酸性介质中,臧红T能被Fenton试剂产生的羟自由基氧化并引起荧光猝灭,而双酚A可以部分清除羟自由基对臧红T的氧化作用,据此可测定双酚A的含量。对实验条件进行了优化,在25 mL样品溶液中分别加入1 mL 4.3 mmol/L臧红T溶液、2 mL pH3.5缓冲溶液、1.4 mL 0.88 mmol/L FeSO_4溶液、1 mL 0.01%的H_2O_2溶液。双酚A的质量浓度在0.4～2.4 mg/L范围内与荧光强度具有良好线性关系,线性相关系数r^2=0.997 8,检出限为10μg/L。测定结果的相对标准偏差为1.5%(n=8),加标回收率为97.8%～102.4%。该方法操作简便,测定结果准确可靠,可用于一次性纸杯中双酚A的测定。
文摘Nessler's reagent spectrophotometry,gas phase molecular absorption spectrometry and ion chromatography were respectively used to determine ammonia nitrogen in surface water.The detection limit,precision,accuracy and recovery rate of the three methods were compared,and the determination results of the actual water samples were analyzed by t test.The results showed that the three methods all could meet the requirement of the laboratory quality control,and there was no significant difference in the determination results.Compared with Nessler's reagent spectrophotometry,the operation of gas phase molecular absorption spectrometry and ion chromatography operation was more convenient and fast and has no pollution,which can be used for the determination of ammonia nitrogen content in a large quantity of surface water samples.
