Briefing Session on Analysis of Nitrate/Nitrite and ... - uri=govtlab.gov
Briefing Session on Analysis of Nitrate/Nitrite and ... - uri=govtlab.gov
Briefing Session on Analysis of Nitrate/Nitrite and ... - uri=govtlab.gov
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<strong>Nitrate</strong>/<strong>Nitrite</strong>: GL Testing method for Cheese Products<br />
Reference to BS EN ISO 14673-3:2004<br />
1. Grind or comminute the sample.<br />
2. Weigh accurately <strong>of</strong> 2.5 g comminuted samples to a 50- 50<br />
mL centrifuge tube.<br />
3. Add 24 mL <strong>of</strong> extracti<strong>on</strong> buffer soluti<strong>on</strong><br />
Buffer soluti<strong>on</strong> :26.6 g <strong>of</strong> NH4Cl + c<strong>on</strong>centrated NH3 in 1L<br />
water (pH~8.5) (p )<br />
4. Preheated to a temperature <strong>of</strong> 50oCto55oC. 5. Mix with the homogenizer for about 3 minutes until the<br />
test porti<strong>on</strong> is well suspended.<br />
Milk <strong>and</strong> milk products –<br />
Determinati<strong>on</strong> <strong>of</strong> nitrate<br />
<strong>and</strong> nitrite c<strong>on</strong>tents<br />
Part 3: Method using<br />
cadmium reducti<strong>on</strong> <strong>and</strong><br />
flow injecti<strong>on</strong> j analysis y with<br />
in-line dialysis (Routine<br />
method)
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