The nitrogenous compounds of must and wine are deriving from grapes and play an important role in fermentation, clarification, and potential microbial instability of wines. They are profoundly modified during the alcoholic fermentation by the physiologic activity of yeast. Thus, yeast assimilates 60-70% of the must nitrogen, ammonium ion completely disappearing during the fermentation and the total nitrogen being slightly reduced.

Ammonia is present in grapes as ammonium in a few milligrams amount and it serves as the primary form of available nitrogen for yeast metabolism. So, the content of ammonium ion can drastically decrease during the alcoholic fermentation, increasing again, especially in red wines, at the end of the malolactic fermentation because the lactic bacteria releases ammonia nitrogen in wine. The amount of ammonium ion in must influences the rapidity of fermentation start and evolution.

The ammonia concentration ranged from 24 to 209 mg/L (ppm) in grapes and from a few mg/L (ppm) to about 50 mg/L (ppm) in wine.

The HI 84185 ISE Ammonia Nitrogen meter measures the ammonia nitrogen (N-NH₃) content in wine using an ion selective electrode. The used method is double standard addition, a simple and rapid method of analysis, and the result is readily displayed in ammonia nitrogen (N-NH₃) mg/L (ppm).

De technische specificaties van dit product:

Accuracy		±5% of reading
Dimensions		208 x 214 x 163 mm (8.2 x 8.4 x 6.4") (with beaker)
Electrodes		HI 61101 Ammonia combined ISE
Environment		0 to 50 °C (32 to 122 °F); max 95% RH non-condensing
LOG feature		50 samples
Power supply		220V/50Hz; 10VA
Range		0 to 50 mg/L (ppm) N-NH3
Resolution		1 mg/L (ppm) N-NH3
Sample volume		50 mL
Stirring speed		500 rpm
Temperature Compensation		Automatic from 0 to 80 °C
Temperature Probe		HI 7662-T (included)
Weight		2200 g (77.6 oz.)

Accessoires bij dit product:

Oplossingen
HI4000-47	pH 4 and 7 Kalibratie vloeistof (buffer)s tbv ISE gas-sensoren
HI4001-51	Ammonia membraankit (20 stuks)
Accessoires
HI731341	1000 micro L volumetrische micropipette
HI731351	Wegwerp punt v. 1000 micro L vol. micropipette (25 st)
Reagentia
HI84185-0	ISA solution for ammonia analysis in wine, 500 mL
HI84185-1	Standard solution No. 1 for ammonia analysis in wine, 500 mL
HI84185-2	Standard solution No. 2 for ammonia analysis in wine, 500 mL
HI84185-20	Ammonia in wijn reagentia set (20 testen)

Selectie van andere producten uit de categorie Ion Selectieve Bench Meters:

Downloads bij dit product:

  Download gebruikershandleiding

  Download MSDS (datasheet)
  Download MSDS (datasheet)
  Download MSDS (datasheet)

  Geen documentatie beschikbaar

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