东北电力大学学士学位毕业论文I摘 要在标准法中，总磷和总氮两项测定都需数小时以上的前处理过程。由于消化条件对测试结果的影响较大,故每次样品测试必须同时做标准曲线。若两个项目分别测定,不仅耗时耗力,又因所采样品保存时间较短,需在 24h 内测定。本课题采用 COD 仪同时消化总磷和总氮，在所有试剂和条件与消化总氮的条件相同的情况下,节省一半的时间和试剂。实验中采用正交试验方案，对消解时间、消解温度、K2S2O8用量、NaOH 用量等实验影响因素进行确定。根据确定的实验因素得出本方法的测定范围，并对试样进行测定与标准法对比。实验结果表明：消解温度120 ，消解时间20min， K2S2O8（5%）=6mL，NaOH(8%)=3mL。结果表明：该方法的本身的精密度及准确度均能达到要求，对水样的测定与标准方法对比具有很高的准确度。关键词 联合测定 总磷 总氮 东北电力大学学士学位毕业论文IAbstractIn the standard method, the total phosphorus and the total nitrogen two determinations both needs several hour above the front treating processes。 Because the digestion condition to tests the result the influence comparatively ，therefore each time the sample test to have simultaneously to make the standard curve。 If two projects separately determine, when consumes expends effort, and further because the sampling retention time compares the ore to need in 24h to determine。 This topic uses the COD meter simultaneously to digest the total phosphorus and the total nitrogen, with digests the total nitrogen in all reagents and the condition the condition same situation ，to save in half time and the reagent experiment uses the orthogonal experiment plan, to temperature, the K2S2O8 amount used, the NaOH amount used experiment and so on dispels the time, dispels affects the factor to carry on the determination。 Obtains this method according to the definite experimental factor the determination scope, and carries on the determination and the standard method contrast to the test specimen。 The experimental result indicated that, Dispels the temperature -120 , dispels time -20min，K2S2O8 (5%)= 6mL, NaOH(8%)=3mL。The result indicated this method itself accuracy and the accuracy can meet the requirements, has the very high accuracy to the water sample determination and the standard method contrast。Keywords：union determination，total phosphorus，total nitroge东北电力大学学士学位毕业论文II目 录摘摘 要要.IABSTRACTABSTRACT .II 第第 1 1 章章 绪绪 论论 .11.1 课题研究的目的和意义.11.2 研究现状.11.2.1 总磷测定.11.2.2 总氮测定.31.2.3 联合测定总磷总氮.31.3 拟定工作.4第第 2 2 章章 实验内容及结果讨论实验内容及结果讨论 .52.1 仪器和试剂.52.1.1 仪器.52.1.2 试剂.52.2 测定原理.62.2.1.标准法测定水中总磷含量.62.2.2 标准法测定水中总氮.62.2.3. 联合测定水中的总氮、总磷.62.3.测定方法.72.4 实验内容与讨论.72.4.1.标准法测磷工作曲线.72.4.2 标准法测氮标样的工作曲线.82.4.3.磷混合液的配制及其浓度的确定.102.4.4.氮混合液的配制及其浓度的确定.