①若A测定超出标准吸光值线性范围:超出最高值建议将待测样本适当稀释后再进行测定;低于最低值可适当增加样本量重新制备待测样本后再进行测定,计算时相应修改;
②显色完成后应在1 h内完成测定,测定管颜色应与标准管颜色一致(蓝色),若显色为黄色或绿色,则表明NH3-N浓度过高,应将待测样本适当稀释后再进行测定,计算时相应修改;
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