BS 6068-2.11:1984
$86.31
Water quality. Physical, chemical and biochemical methods – Determination of ammonium: manual spectrometric method
| Published By | Publication Date | Number of Pages |
| BSI | 1984 | 12 |
1.1 Substance determined
This part of ISO 7150 specifies a manual spectrometric method for the determination of ammonium in water.
NOTE An automated spectrometric method for the determination of ammonium will form the subject of ISO 7150/2.
1.2 Type of sample
The method 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 (see clause 10). For interferences, see clause 9.
1.3 Range
An ammonium nitrogen concentration, ϱN 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.
1.4 Limit of detection1)
When using cells of optical path length 40 mm and a 40 ml test portion, the limit of detection lies within the range ϱN = 0,003 to 0,008 mg/l.
1.5 Sensitivity1)
Using a 40 ml test portion and a cell of optical path length 40 mm, ϱN = 0,200 mg/l gives an absorbance of about 0,69 units.
Using a 40 ml test portion and a cell of optical path length 10 mm, ϱN = 0,750 mg/l gives an absorbance of about 0,65 units.
Applicable to the determination of ammoniacal nitrogen in drinking and waste waters in the range 0.01 to l mg/l.
