ISO 23697-2:2023 水的质量 用小型密封管测定水中总结合氮（ST-TNb） 第2部分：变色酸显色反应
标准编号：ISO 23697-2:2023
中文名称：水的质量 用小型密封管测定水中总结合氮（ST-TNb） 第2部分：变色酸显色反应
英文名称：Water quality — Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes — Part 2: Chromotropic acid colour reaction
发布日期：2023-02
标准范围
本文件规定了总结合氮的测定方法？（ST-TNb）存在于各种来源的水中:地下水、地表水和废水中，浓度测量范围通常在0.5？mg/l和150？mg/l的ST-TNb，使用小规模密封管法。可能需要不同的小规模密封管方法的测量范围。根据不同制造商的小型密封管方法的类型，测量范围可能会有所不同。用户可以选择具有适当应用范围的小型密封管测试，或者通过初步稀释来调整浓度超过测试测量范围的样品。笔记？小型密封管测试的结果在测试应用范围的中间是最精确的。所有小型密封管方法都是基于加热块中加热的碱性过硫酸钾氧化，温度为100？℃和不同的消化时间是适用的。根据所用小型密封管的典型操作程序，应用变色反应，见条款？9.
This document specifies a method for the determination of total bound nitrogen (ST-TNb) in water of various origins: groundwater, surface water and wastewater, in a measuring range of concentration generally between 0,5 mg/l and 150 mg/l of ST-TNb using the small-scale sealed tube method. Different measuring ranges of small-scale sealed tube methods can be required.
The measuring ranges can vary depending on the type of small-scale sealed tube method of different manufacturers.
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 The results of a small-scale sealed tube test are most precise in the middle of the application range of the test.
All small-scale sealed tube methods are based on a heated alkaline potassium persulfate oxidation in a heating block at 100 °C and different digestion times are applicable. Chromotropic colour reaction is applied, depending on the typical operating procedure of the small-scale sealed tube used, see Clause 9.
标准预览图
