EN
Tests For: Soluble Manganese in Water
Tests Range: 0–5 mg/L
Reagent Chemistry Used: Tormaldoxime
Method Detection Limit*: 0.03 mg/L
Limit of Quantification**: 0.08 mg/L
Manganese-containing minerals occur widely, and manganese salts are commonly found in many natural waters. Manganese is an objectionable constituent in water used for domestic purposes or industrial applications. In domestic situations, manganese will cause brown or black staining to laundry or plumbing fittings even at very low concentrations. In process applications such as paper manufacturing or textile finishing similar staining can occur. Manganese salts may impart an astringent taste to drinking water supplies, and in swimming pool applications can give an aesthetically displeasing brown coloration to the water.
In most cases where manganese salts occur naturally in the water, it will be necessary to apply special methods of removal before the water can be used for domestic or industrial purposes. The Palintest Manganese test provides an extremely sensitive method of measuring low concentrations of manganese for the assessment of natural waters and the control of manganese removal plant. The test measures total manganese over the range 0–5 mg/L.
Manganese may occur in water in various different valency states. This method offered is the Formaldoxime Method, with a range of 0–5 mg/L Mn. In alkaline solution manganese reacts with formaldoxime to form an orange-red complex. The colour developed is proportional to the manganese concentration.
The intensity of colour produced in the test is proportional to the total manganese concentration and is measured using a Palintest Photometer.
Iron (II) and Iron (III) will interfere with the test and cause false positive results. Even low levels of Iron (0.1 mg/L) will interfere.
Copper will interfere and cause false positive results; this is characterised by the formation of a blue solution during the test.
