General information:
Mangan is present in many soils and sediments as well as in rocks whose structure has been modified due to heat and pressure. Manganese is found in waters of depth between 2-3 mg / liter. It is difficult to eliminate due to the conditions that must be met (pH, bicarbonate / carbonate ratio, and the presence of other minerals especially iron).
Referential after which the analysis is performed:
The analysis for determining the manganese content in drinking water is performed within its own laboratory according to the national standard SR 8662-2:1996.
Principi of the method:
Determination of the manganese content in drinking water is performed by the spectroscopy method of atomic absorption in flame.
Canuses of sample rejection – quantity of unsuitable sample, samples collected in inappropriate containers, samples not properly labelled, etc.
Recipient of collection – clean container, before sampling, the container after being washed in the usual way, is washed with nitric acid d = 1.4 diluted 1+1 and then with water.
Quantity of sample required to perform the analysis - minimum 100ml.
Processing required after harvesting – Samples, of about 1L, are taken in glass or plastic containers. The determination of the managan is performed on samples filtered by filter paper with medium porosity, washed with nitric acid d = 1.4 taken 1+1. The preservation of the samples is done by adding nitric acid d = 1.4 to pH = 1... 3, and another 2 ml for each liter of sample.
Sample stability – freshly harvested water is stable for 2 days at 2-8°C or 6 hours at ambient temperature.
Analysis method –spectroscopy of atomic absorption in flame.
Reference values according to water law1)
| Parameter / Unit of measurement | Cour value (Maximum permissible concentration) |
| Mnagan, μg/L | 50 |
Recommendations for performing the analysis/ Effects of exceeding the reference values –
For the reduction of the managan content of the water, special deferization/ demanganization installations are often used.
Bibliography:
- LEGEA 458/2002 with subsequent amendments and completions Law no. 311/2004, Government Ordinance no. 11/2010, Law no. 124/2010 and Government Ordinance no. 1/2011
