Tests For: Total Persulfate Nitrogen in Natural and Wastewater
Test Range: 0–30 mg/L N
Reagent Chemistry Used: Alkaline persulphate digestion, chromotropic acid
Method Detection Limit*: 1.21 mg/L
Limit of Quantification**: 3.84 mg/L
Total nitrogen is a vital test for assessing the quality of effluents and wastewater prior to discharge. In the UK the Urban Wastewater Treatment Regulations (1994) make provision for the control of discharge of total nitrogen to sensitive bodies of natural water. The monitoring of the rate of nitrogen removal is therefore of great importance in wastewater treatment. Total nitrogen is composed of nitrate, nitrite, ammonium, and organic nitrogen compounds. The Palintest Tubetests Total Nitrogen/30 test provides a simple method of measuring total persulfate nitrogen over the range 0–30 mg/L N.
The Palintest Tubetests Total Nitrogen/30 test is a two-stage procedure. The sample is initially digested with alkaline persulfate to break down nitrogenous compounds which are then converted to nitrate. The digested sample is then transferred to a Palintest Tubetests Nitrate/30N Tube for determination of the total nitrogen present. The reagents are provided in the form of pre-dispensed tubes and powders. The powders are added using a specially designed scoop and funnel.
The intensity of the colour produced in the test is proportional to the total nitrogen concentration and is measured using a Palintest Photometer.
In total nitrogen determinations, the recovery of different compounds depends to an extent on the method of oxidisation used to make the conversion to nitrate. It is normal practice to refer to the method of oxidisation when stating test results for any formal purpose. Results from the Palintest Total Nitrogen test should therefore be expressed as ‘Total Persulfate Nitrogen’.
|Glycine||95% all levels|
|Urea||95% all levels|
|Nicotinic Acid||95% at 10 mg/L, 45% at 30 mg/L|
|Creatinine||100% at 10 mg/L, 70% at 30 mg/L|