分光光度法测定海水中缩二脲的含量
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摘要
建立了测定海水中缩二脲含量的分光光度法。样品经碳酸钠、氢氧化钠过滤预处理后,在550nm波长处测定,测定相对标准偏差为0. 72%～2. 79%,相对误差为-0. 30%～0. 75%,标准曲线线性、精密度、准确度均良好,检出限2. 00 mg/L,定量限6. 00 mg/L,加标回收率95. 4%～100. 7%。该方法准确、可靠、抗干扰性好,可用于海水中缩二脲的测定,也可以用于异氰酸酯类海洋污染事故的应急监测。
A method for determination of Biuret in seawater by spectrophotometry was established. Sample was preprocessed by sodium carbonate sodium hydroxide filtration. The wavelength was 550 nm. Relative standard deviation was 0. 72% ～ 2. 79%,and relative error was-0. 30 ～ 0. 75%. The linear precision accuracy of standard curves was good,detection limit was 2. 00 mg/L,quantitative limit was 6. 00 mg/L,and the recovery rate was 95. 4% ～ 100. 7%.The method is accurate,reliable and good at anti-jamming,which can be used for the determination of Biuret in seawater. And it can also be used for emergency monitoring of isocyanate marine pollution accidents.
A method for determination of Biuret in seawater by spectrophotometry was established. Sample was preprocessed by sodium carbonate sodium hydroxide filtration. The wavelength was 550 nm. Relative standard deviation was 0. 72% ～ 2. 79%,and relative error was-0. 30 ～ 0. 75%. The linear precision accuracy of standard curves was good,detection limit was 2. 00 mg/L,quantitative limit was 6. 00 mg/L,and the recovery rate was 95. 4% ～ 100. 7%.The method is accurate,reliable and good at anti-jamming,which can be used for the determination of Biuret in seawater. And it can also be used for emergency monitoring of isocyanate marine pollution accidents.
引文
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[5]王祖翔,蒋俊,孙莉,等.高效液相色谱-串联质谱法测定食品中的尿素、缩二脲与双氰胺[J].分析测试学报,2012,31(5):593-599.
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[2]高振华.异氰酸酯室温下与醇、水反应及较高温度下与纤维素反应的研究[D].哈尔滨:东北林业大学,2003:93-94.
[3]宋学兰,张静,胡桂萍.尿素硝酸铵溶液中缩二脲测定方法探讨[J].大氮肥,2017,40(1):62-67.
[4]李香红.复合肥中缩二脲测定方法的改进[J].磷肥与复肥,2016,31(12):39-40.
[5]王祖翔,蒋俊,孙莉,等.高效液相色谱-串联质谱法测定食品中的尿素、缩二脲与双氰胺[J].分析测试学报,2012,31(5):593-599.
[6]国家标准化管理委员会.海洋监测规范:GB17378—2007[S].北京:中国标准出版社,2008.