中华人民共和国国家生态环境标准HJ1221—2021环境空气降尘的测定重量法Ambientair—Determinationofdustfall—Gravimetricmethod本电子版为正式标准文本，由生态环境部环境标准研究所审校排版。2021-12-16发布2022-06-01实施生态环境部发布MinistryofEcologyandEnvironmentHJHJ1221—2021i目次前言.................................................................................................................................................................ii1适用范围........................................................................................................................................................12规范性引用文件.............................................................................................................................................13术语和定义....................................................................................................................................................14方法原理........................................................................................................................................................15干扰和消除....................................................................................................................................................16试剂和材料....................................................................................................................................................17仪器和设备....................................................................................................................................................28样品................................................................................................................................................................29分析步骤........................................................................................................................................................310结果计算与表示................................................................................................
