Determination of nitrate in forages by using selective ion electrode: collaborative study.
Each of 10 collaborating laboratories analyzed 4 blind duplicate pairs of forage samples for nitrate, by using a potentiometric method. Two forage controls and a 100 000 mg KNO3/L standard were also provided. Nitrate was extracted into an aqueous Al2(SO4)3 solution containing 70 mg KNO3/L and quantitated with a nitrate-selective electrode. Standards were prepared using extracting solution as diluent. Nitrate concentrations in forage samples ranged from less than 0.50 to 4.35% KNO3. Repeatability coefficients of variation (CVo) ranged from 1.74 to 3.61%, and reproducibility coefficients of variation (CVx) ranged from 6.92 to 7.66%. Mean recovery of a 0.55% KNO3 spike was 94.5%. The method has been adopted official first action.
Carlson
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MP
Schneider
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NR
D000821:Animal Feed / Q000032:analysis*; D004566:Electrodes; D009566:Nitrates / Q000032:analysis*; D011199:Potentiometry; D011786:Quality Control
D009566:Nitrates