Vattenkvalitet

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 25 mar 2021
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This document specifies a method for the determination of ammonium nitrogen (NH4-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 NH4 or NH3 or NH3 or NH3-N.
This method is applicable to (NH4-N) concentration ranges from 0,01 mg/l to 1 800 mg/l of NH4-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. Appropriate preliminary dilution of the sample shall be performed or a small-scale sealed-tube method with a different application measuring range shall be used.
All manufacturers' methods are based on the Berthelot reaction and its modifications to develop indophenol blue colour. Reagents mixtures could differ slightly based on manufacturers small-scale sealed tube method. This method is applicable to direct determination of samples by using small-scale sealed tubes for the determination of drinking water, groundwater, surface water, wastewater and on preserved samples. The method is applicable after separation of suspended materials by filtration.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 25 mar 2021
Se merSe mindre
 

This document specifies a method for the determination of nitrate as NO3-N in water of various origin as natural water (including groundwater, surface water and bathing water), drinking water and wastewater, in a measuring range of concentration between 0,10 mg/l and 225 mg/l of N-N03 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 the 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. Appropriate preliminary dilution of the sample shall be performed or a small‑scale sealed tube method with a different application measuring range shall be used.
Manufacturers' small‑scale sealed tube methods are based on dimethylphenol colour reaction depending on the typical operating procedure of the small‑scale sealed tube used.
If required by laws, regulamentations or standards, the data can be expressed as NO3 after conversion with the stoichiometric conversion factor 4,426 81.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 25 mar 2021
Se merSe mindre
 

This document specifies a method for the determination of nitrate as NO3-N in water of various origin as natural water (including groundwater, surface water and bathing water), drinking water and wastewater, in a measuring range of concentration between 0,10 mg/l and 225 mg/l of N-N03 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 the 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. Appropriate preliminary dilution of the sample shall be performed or a small‑scale sealed tube method with a different application measuring range shall be used.
Manufacturers' small-scale sealed tube methods are based on chromotropic colour reaction, depending on the typical operating procedure of the small‑scale sealed tube used.
If required by laws, regulamentations or standards, the data can be expressed as NO3 after conversion with the stoichiometric conversion factor 4,426 81.

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 25 mar 2021
Se merSe mindre
 

This document specifies a method for the determination of total nitrogen (TNb) in water of various origins: natural water and wastewater, in a measuring range of concentration generally between 0,5 mg/l and 220 mg/l of 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. Concentrations even slightly higher than the upper limit indicated in the manufacturers manual relating to the small‑scale sealed tube methods used, cannot be reported as accurate results. Appropriate preliminary dilution of the sample shall be performed or a small‑scale sealed tube method with a different application measuring range shall be used.
All small‑scale sealed tube methods are based on a heated alkaline potassium persulfate oxidation in a heating block. Different digestion temperatures, 100 °C or 120 °C or 170 °C, and different digestion times maybe applicable. Dimethylphenol colour reactions are applied, depending on the typical operating procedure of the small‑scale sealed tube used.
NOTE The notation TNb is often reported by International Standards and represents "total bound nitrogen".

Kommittébeteckning: SIS/TK 424 (Kemiska vattenundersökningar)
Källa: ISO
Svarsdatum: den 28 mar 2021
Se merSe mindre
 

This document specifies a method for the determination of total nitrogen (TNb) in water of various origins: natural water and wastewater, in a measuring range of concentration generally between 0,5 mg/l and 220 mg/l of 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. Concentrations even slightly higher than the upper limit indicated in the manufacturers manual relating to the small-scale sealed tube methods used, cannot be reported as accurate results. Appropriate preliminary dilution of the sample shall be performed or a small‑scale sealed tube method with a different application measuring range shall be used.
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 maybe be applicable. Chromotropic colour reaction is applied, depending on the typical operating procedure of the small‑scale sealed tube used.
NOTE The notation TNb is often reported by International Standards and represents "total bound nitrogen".