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Discussion on Mode of Standard Addition in Determining Ammonia Nitrogen with Flocculation Pretreatment
Author(s): 
Pages: 134-137
Year: Issue:  12
Journal: Environmental Science and Management

Keyword:  ammonia nitrogenflocculation pretreatmentstandard addition moderecovery ratequality control;
Abstract: 加标是环境监测质量控制的重要措施之一。测定氨氮的过程中,絮凝后上清液的加标回收合格率较高,而理论上加标物质应参与包括预处理在内的样品测定全过程。在絮凝法预处理效果优化的前提下,为了探讨标准物质在分析过程中产生的损失,对加标量与样品含量比值范围以及加标回收率分布进行了研究,发现絮凝造成氨氮损失了4.2%,由此提出将加标回收率合格范围的下限调整为85%是合适的。
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