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现有国家标准，在复混肥料总氮含量测定的预处理部分存在着缺陷，本文提供了二种硝酸态氮的鉴别方法和一种新的预处理方法──低温水解法，通过对复混肥料总氮含量测定预处理方法的补充和改进，避免了硝酸态氮的漏测。
Existing national standards, there are flaws in the pretreatment part of the total nitrogen content of the compound fertilizer, this article provides two kinds of identification methods of nitrate nitrogen and a new pretreatment method ─ ─ low temperature hydrolysis, The total nitrogen content of fertilizer pretreatment methods to supplement and improve, to avoid the nitrate nitrogen leak detection.