WARNINGTM 5-6630-215-12Nessler’s Reagent APHA.Contains mercuriccompound and sodium hydroxide.External or eyecontact:Flush with water.Ingestion:giveplenty of water or milk.Follow with citrus juiceor dilute vinegar.Table vinegar is approximately4% acedic acid.Induce vomiting.d. Nitrogen Ammonia 0-2 mg/l range (figs. 2-11 and 2-12, and para2-18).(1) Ammonia nitrogen is a product of the microbiological decayof plant and animal protein.It can be reused directly by plants andis commonly used in commercial fertilizers.Its presence in rawsurface waters is uncommon and indicates domestic pollution.TheNessler method for ammonia nitrogen testing is a sensitive, single-reagent test, free from most common interferences.Distillation isnot required for most samples and the Nessler reagent is stable forover one year.NOTEThe temperature of the demineralized water and thewater sample should be 20°+ or -1°C (68°F)for best results.Higher temperature will causehigh readings and lower temperatures will causelow results.If the Nessler reagent becomes dark brown itshould be discarded and a fresh supply ordered.A precipitate in the bottom of the reagent bottleis normal.These solids must not be disturbed intransferring the reagent to either solution orerratic answers may result.The results may be expressed as mg/l ammonia (NH3)or mg/l ammonium (NH4 ) by multiplying the mg/lammonia nitrogen (N) by 1.22 or by 1.29, respect-ively.When testing water samples containing greaterthan 100 mg/l hardness (about 6 grains pergallon) (para 2-22g) a positive interference mayresult due to the precipitation of magnesiumhydroxide.To eliminate this interference, addone drop of Rochelle Salt reagent (6, fig. 1-5)to the demineralized water and to the water samplebefore adding the Nessler reagent in step (c).2-45
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