中华人民共和国国家环境保护标准HJ923-2017土壤和沉积物总汞的测定催化热解-冷原子吸收分光光度法Soil and sediment—Determination of total mercury—Catalytic pyrolysis-cold atomic absorption spectrophotometry（发布稿）本电子版为发布稿请以中国环境出版社出版的正式标准文本为准2017-12-28发布2018-04-01实施发布环境保护部目次前言.................................................................................................................................................ii1适用范围.........................................................................................................................................12规范性引用文件.............................................................................................................................13方法原理.........................................................................................................................................14试剂和材料.....................................................................................................................................15仪器和设备.....................................................................................................................................26样品.................................................................................................................................................27分析步骤.........................................................................................................................................38结果计算与表示.............................................................................................................................49精密度和准确度.............................................................................................................................510质量保证和质量控制...................................................................................................................5