SIST ISO 6778:1996 PDF

Water quality -- Determination of ammonium -- Potentiometric method

Title (English):

SIST ISO 6778:1996

Water quality -- Determination of ammonium -- Potentiometric method

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 5
Publication date:: June 1, 1996
ICS:: 13.060.50
Technical committee:: KAV - Water quality

Document language:

enru

Delivery time:1–7 days

Price:44 €

Description (English):

Specifies a procedure using an ammonia-sensing membrane probe for raw and waste water and sewage. The procedure is applicable to ammonium nitrogen concentration of up to 50 mg/l.The limit of detection is defined as the limit of Nernstian response under the conditions specified and has a value corresponding to approximately 0,2 mg/l.

Technical details

SKU: SIST ISO 6778:1996

Abstract

Overview

ISO 6778:1984 specifies a potentiometric method for the determination of ammonium in raw water, sewage and wastewater using an ammonia‑sensing membrane probe (ammonia ion‑selective electrode). The procedure covers routine laboratory measurement up to 50 mg N/l (as ammonium nitrogen) without dilution and defines the limit of detection as the Nernstian response limit - approximately 0.2 mg N/l under the prescribed conditions. The method converts ammonium to ammonia by alkaline treatment and measures the electrode potential according to the Nernst equation.

Key topics and technical requirements

Measuring principle: ammonia-permeable membrane electrode measures partial pressure of ammonia after converting NH4+ to NH3 at pH ~12 (alkaline buffer with NaOH + EDTA).
Range and detection: applicable up to 50 mg N/l; detection limit ~0.2 mg N/l (Nernstian limit).
Nernstian response / slope: electrode potential varies about ~58.5 ± 2 mV per decade change in ammonium concentration at normal lab temperature.
Calibration and standards: use chloride‑based ammonium standards (e.g., 1000 mg N/l and 100 mg N/l stock solutions) to prepare calibration points bracketing expected sample concentrations.
Instrumentation: ammonia membrane probe (ion‑selective electrode), potentiometer with 0.2 mV precision, magnetic stirrer and 100 ml conical flasks.
Sample handling: analyze promptly or store at 2–5 °C; optional acidification (pH

Related standards

Mentioned in the description and other SIST standards

Overview

Key topics and technical requirements

Measuring principle: ammonia-permeable membrane electrode measures partial pressure of ammonia after converting NH4+ to NH3 at pH ~12 (alkaline buffer with NaOH + EDTA).
Range and detection: applicable up to 50 mg N/l; detection limit ~0.2 mg N/l (Nernstian limit).
Nernstian response / slope: electrode potential varies about ~58.5 ± 2 mV per decade change in ammonium concentration at normal lab temperature.
Calibration and standards: use chloride‑based ammonium standards (e.g., 1000 mg N/l and 100 mg N/l stock solutions) to prepare calibration points bracketing expected sample concentrations.
Instrumentation: ammonia membrane probe (ion‑selective electrode), potentiometer with 0.2 mV precision, magnetic stirrer and 100 ml conical flasks.
Sample handling: analyze promptly or store at 2–5 °C; optional acidification (pH

SIST ISO 6778:1996 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Related standards

Abstract

Overview

Key topics and technical requirements

Related standards

Water quality — Determination of ammonium — Potentiometric method

Method to calculate GHG emissions at LNG plant (ISO 6338:2023)

Additive manufacturing of metals - Powder bed fusion (PBF) - In-situ coaxial photodiode monitoring for lack o…

Facility management - Development of the facility management organization (ISO 41002:2026)

Rigid cellular plastics - Determination of compressive properties (ISO 844:2026)

Processing of health care products - Information to be provided by the medical device manufacturer for the pr…

Ophthalmic optics - Uncut finished spectacle lenses - Part 4: Specifications and test methods for the propert…

Anaesthetic and respiratory equipment - Tracheal tubes and connectors - Amendment 1: Reinstatement of third e…