hj 668-2013 水质 总氮的测定 流动注射-盐酸萘乙二胺分光光度法

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1、中华人民共和国国家环境保护标准HJ668-2013水质总氮的测定流动注射-盐酸萘乙二胺分光光度法Waterquality-Determinationoftotalnitrogenbyflowinjectionanalysis（FIA）andN-(1-naphthyl)ethylenediaminedihydrochloridespectrophotometry（发布稿）本电子版为发布稿。请以中国环境科学出版社出版的正式标准文本为准。2013-10-25发布2014-01-01实施环境保护部发布目次前言............................................

2、.....................................................................................................II1适用范围..................................................................................................................................12规范性引用文件..................................................

3、....................................................................13方法原理..................................................................................................................................14干扰和消除......................................................................................

4、........................................15试剂和材料..............................................................................................................................26仪器和设备.....................................................................................................................

5、.........37样品..........................................................................................................................................38分析步骤..................................................................................................................................39结果计算与表示.

6、.....................................................................................................................410精密度和准确度......................................................................................................................411质量保证和质量控制........................................

7、......................................................................512注意事项..................................................................................................................................6附录A（资料性附录）