HJ634-2012土壤氨氮、亚硝酸盐氮、硝酸盐氮的测定氯化钾溶液提取-分光光度法.pdf

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1、中华人民共和国国家环境保护标准HJ634—2012土壤氨氮、亚硝酸盐氮、硝酸盐氮的测定氯化钾溶液提取-分光光度法Soil-Determinationofammonium,nitriteandnitratebyextractionwithpotassiumchloridesolution-spectrophotometricmethods（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。2012-02-29发布2012-06-01实施环境保护部发布目次前言················

2、···························································································································II1适用范围·······························································································································

3、12规范性引用文件···················································································································13方法原理·······························································································································

4、14试剂和材料···························································································································15仪器和设备························································································································

5、···46样品·······································································································································57分析步骤·············································································································

6、··················58结果计算与表示···················································································································79精密度和准确度··········································································································

7、·········810质量保证和质量控制········································································································9附录A（资料性附录）本标准与ISO/TS14256-1:2003（E）的章条编号对照·····················10附录B（资料性附录）本标准与ISO/TS14256-1:2003（E）的技术性差异及其原因·········12附录C（资料性附录）

8、还原柱的制备······················································································13I前言为贯彻《中华人民共和国环境保护法》，保护环境，保障人体健康，规范土壤中氨氮、亚硝酸盐氮、硝酸盐氮的测定方法，制订本标准。本标准规定了测定土壤中氨氮、亚硝酸盐氮、硝酸盐氮的氯化钾溶液提取－分光光度法。本标准的技