水质.水中铵态氮的测定.小型密封管法

[中文适用范围]： 本标准规定了小规模密封管法测定饮用水、地下水、地表水、废水、沐浴水和矿泉水中铵态氮（NH4-N）的方法。 结果可表示为 NH4 或 NH4-N 或 NH3 或 NH3-N。 注1：在污水处理的习惯用语中以及自动密封管测试光度计或分光光度计的显示屏上，不带正电荷的NH4已成为参数铵的常用符号。 尽管不是完全正确的化学命名法，但本文件中还是采用了这种符号。 该方法适用于 NH4-N 浓度范围为 0.01 mg/l 至 1800 mg/l。 根据不同制造商的小规模密封管法的类型，浓度的测量范围可能有所不同。 即使浓度稍高于制造商手册中有关所用小规模密封管方法的上限，也不能报告为准确的结果。 用户可以选择适合应用范围的小规模密封管测试，或者通过初步稀释来调整浓度超过测试测量范围的样品。 注 2：小规模密封管的结果在测试应用范围的中间是最精确的。 所有制造商的方法均基于 Berthelot 反应及其改进，以产生靛酚蓝颜色。 根据制造商的小规模密封管方法，试剂混合物可能略有不同，请参见第 9 条。 本方法适用于使用小规模密封管测定饮用水、地下水、地表水、废水和废水的非保存样品。 保存的样品。 该方法适用于含有悬浮物质的样品，如果这些物质可通过过滤去除。 [外文原描述]： This document specifies a method for the determination of ammonium nitrogen (NH 4 -N) in drinking water, groundwater, surface water, wastewater, bathing water and mineral water using the small-scale sealed tube method. The result can be expressed as NH 4 or NH 4 -N or NH 3 or NH 3 -N. NOTE 1 In the habitual language use of sewage treatment and on the displays of automated sealed-tube test photometers or spectrophotometers, NH 4 without indication of the positive charge has become the common notation for the parameter ammonium. This notation is adopted in this document even though not being quite correct chemical nomenclature. This method is applicable to (NH 4 -N) concentration ranges from 0,01 mg/l to 1 800 mg/l of NH 4 -N. The measuring ranges of concentration can vary depending on the type of small-scale sealed tube method of different manufacturers. Concentrations even slightly higher than the upper limit indicated in the manufacturers manual relating to the small-scale sealed tube method used, cannot be reported as accurate results. It is up to the user to choose the small-scale sealed tube test with the appropriate application range or to adapt samples with concentrations exceeding the measuring range of a test by preliminary dilution. NOTE 2 The results of a small-scale sealed tube are most precise in the middle of the application range of the test. All manufacturers' methods are based on the Berthelot reaction and its modifications to develop indophenol blue colour. Reagents mixtures can differ slightly based on manufacturers small-scale sealed tube method, see Clause 9 . This method is applicable to non-preserved samples by using small-scale sealed tubes for the determination of drinking water, groundwater, surface water, wastewater and to preserved samples. The method is applicable to samples with suspended materials if these materials are removable by filtration.