STN EN ISO 23697-2
| Name: | STN EN ISO 23697-2 |
| Validity: | Valid |
| Number of pages: | 20 |
| Language: |
EN
Pripravuje sa preklad do slovenského jazyka. Pre viac informácií nás kontaktujte na navrhynoriem@normoff.gov.sk
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| Paper: | 14,10€ |
| Electronic version |
a) Only read (without ability to print and copy)
12,69€ b) Without ability to print, with ability to copy (printscreen) 14,10€ c) With ability to print and copy (printscreen) 18,33€ |
| Slovak title | Kvalita vody. Stanovenie celkového viazaného dusíka (ST-TNb) vo vode skúmavkovou metódou pre malé objemy vzoriek. Časť 2: Farebná reakcia s kyselinou chromotropovou (ISO 23697-2: 2023) |
| English title | Water quality - Determination of total bound nitrogen (ST-TNb) in water using small-scale sealed tubes - Part 2: Chromotropic acid colour reaction (ISO 23697-2:2023) |
| Release Date: | 01. 05. 2026 |
| Date of withdrawal: | |
| ICS: | 13.060.50 |
| Sorting character/National clasification code | 75 7494 |
| Level of incorporation: | idt ISO 23697-2:2023, idt EN ISO 23697-2:2025 |
| Official Journal | 04/26 |
| Amendments | |
| Replaced by: | |
| Repleces: | |
| Note in Official Journal: | Rozpracovaná prekladom. |
| Subject of the standard: | 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 ... |
| Preview: | Náhľad normy (PDF) |