ISO 6777:1984
Water quality — Determination of nitrite — Molecular absorption spectrometric method
Water quality — Determination of nitrite — Molecular absorption spectrometric method
- Статус документа:
- Действующий
- Формат:
- Электронный (PDF)
- Количество страниц:
- 5
- Дата публикации:
- 1 июля 1984 г.
- Издание:
- ISO IS 6777 edition 1 version 1
- ICS:
- 13.060.50
Specifiies a method for potable, raw and waste water. A list of effects of other substances on the result is given in the annex. As standard nitrite solutions may become unstable, the concentration of these solutions has to be checked by a given procedure.
Abstract
Overview
ISO 6777:1984 specifies a molecular absorption spectrometric method for the determination of in potable, raw and wastewater. The method is based on diazotization at using amino‑benzene sulfonamide in the presence of orthophosphoric acid, followed by coupling with a naphthyl‑diamine reagent to form a pink azo dye. Absorbance is measured at about . The standard covers sample handling, reagents, calibration, detection limits, interference assessment and quality checks for standard nitrite solutions.
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