ISO 7150-1:1984 PDF

Name: ISO 7150-1:1984 — Water quality — Determination of ammonium — Part 1: Manual spectrometric method
SKU: ISO 7150-1:1984
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Water quality — Determination of ammonium — Part 1: Manual spectrometric method

Название (английский):

ISO 7150-1:1984

Water quality — Determination of ammonium — Part 1: Manual spectrometric method

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 1 мая 1984 г.
Издание:: ISO IS 7150 edition 1 version 1
ICS:: 13.060.50

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Описание (английский):

The procedure is applicable to the analysis of potable water, and most raw and waste waters. Application to excessively coloured or saline waters shall be preceded by distillation. An ammonium nitrogen concentration of up to 1 mg/l, using the maximum test portion of 40 ml, can be determined. Much higher concentrations can be determined by taking smaller test portions.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 7150-1:1984 specifies a manual spectrometric method for the determination of ammonium (ammonium nitrogen) in water. The method measures a blue compound formed by reaction of ammonium with sodium salicylate, sodium dichloroisocyanurate (generating hypochlorite in situ) and sodium nitroprusside, with spectrometric measurement at about 655 nm. It applies to potable water and most raw and waste waters; excessively coloured or saline samples should be pre‑treated by distillation (see ISO 5664).

Key topics and technical requirements

Analytical range and sensitivity

Maximum test portion: 40 ml; with this volume ammonium‑N up to 1 mg/L can be determined. Higher concentrations are handled by using smaller test portions.
Limit of detection (40 mm cell, 40 ml): ≈ 0.003–0.008 mg/L (ammonium nitrogen).
Example sensitivities: 40 ml + 40 mm cell, 0.200 mg/L gives absorbance ≈ 0.69; 40 ml + 10 mm cell, 0.750 mg/L gives absorbance ≈ 0.65.

Reaction conditions

Reaction pH ≈ 12.6 (alkaline); incubation in a water bath or incubator at 25 ± 1 °C.
Incubation time: measure after at least 60 minutes.

Instrumentation and reagents

Spectrometer at ~655 nm, cells path length 10–50 mm.
Key reagents: sodium salicylate + trisodium citrate, sodium nitroprusside, sodium dichloroisocyanurate solution.
Reagent and standard stability notes included (e.g., colour reagent stable ~2 weeks).

Quality control and calibration

Nine‑point calibration series; blank tests and recording of actual absorbance values every batch.
Routine use of a control standard (≈50% of highest calibration concentration) to detect bias.

Interferences

Primary amines (e.g., aniline, ethanolamine) and substances that reduce hypochlorite can cause serious interference.
In saline waters, magnesium precipitation can interfere; distillation is recommended when citrate complexing capacity is exceeded.

Practical applications and users

Environmental and water testing laboratories

Drinking water and wastewater utilities

Regulatory agencies and compliance monitoring programs

Research labs conducting water quality analysis

Typical uses include routine monitoring of ammonium in potable water, raw and treated wastewaters, process control in treatment plants, and environmental compliance testing where a validated spectrophotometric ammonium method is required.

Related standards

ISO 5664 - Distillation procedure for ammonium prior to analysis (referenced for coloured/saline samples)

ISO 7150-2 - Automated spectrometric method (covers automation of the chemistry described here)

Keywords: ISO 7150-1, ammonium determination, manual spectrometric method, water quality, ammonium nitrogen, spectrophotometric analysis, water testing, potable water, wastewater.

ISO 7150-1:1984 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Practical applications and users

Related standards

Технические детали

SIST ISO 5664:1996

Water quality -- Determination of ammonium -- Distillation and titration method

SIST ISO 7150-1:1996

Water quality -- Determination of ammonium -- Part 1: Manual spectrometric method

ISO 7150-2:1986

Water quality — Determination of ammonium — Part 2: Automated spectrometric method