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首页> 外文期刊>Journal of AOAC International >Repeatability and reproducibility of determination of the nitrogen content of fishmeal by the combustion (Dumas) method and comparison with the Kjeldahl method: interlaboratory study.
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Repeatability and reproducibility of determination of the nitrogen content of fishmeal by the combustion (Dumas) method and comparison with the Kjeldahl method: interlaboratory study.

机译：燃烧（杜马斯）法测定鱼粉中氮含量的可重复性和可重复性，以及与凯氏定氮法的比较：实验室间研究。

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摘要

Ten fishmeal samples (hidden duplicates of 4 meals plus 2 high-protein meals as a Youden pair), tryptophan, and nicotinic acid were analysed by 18 laboratories using the Dumas method. Thirteen of the laboratories also analysed the same 12 samples using their current Kjeldahl method. Recoveries (+or- sR) of tryptophan and nicotinic acid were 99.3+or-1.04 and 98.8+or-2.11% by Dumas and 97.1+or-3.03 and 74.6+or-26.76% by Kjeldahl. The Dumas method gave significantly greater values (P<0.001) than the Kjeldahl method. For fishmeals, Kjeldahl N=0.989 of Dumas N (P<0.001). A similar proportionate difference (0.984 of Dumas N) was observed with tryptophan. Most laboratories failed to determine nicotinic acid correctly by Kjeldahl. For fishmeals, the relative standard deviations for repeatability and reproducibility were for Dumas 1.48 and 2.01% and Kjeldahl 1.62 and 2.37%, respectively. A single analysis conducted in 2 laboratories should not differ by more than 5.63% of the mean value when measured by Dumas or by more than 6.64% by Kjeldahl. It is concluded that with fishmeal, Dumas gives a more reliable measure of organic nitrogen than Kjeldahl, and, therefore, Dumas should be the method of choice..
机译：18个实验室使用Dumas方法分析了10个鱼粉样品（4餐的隐藏重复项和2个Youden对的高蛋白餐），色氨酸和烟酸。 13个实验室还使用其当前的凯氏定氮法对同样的12个样品进行了分析。色氨酸和烟酸的回收率（+或-sR），杜马斯分别为99.3+或-1.04和98.8+或-2.11％，凯氏定氮法的回收率为97.1+或-3.03和74.6+或-26.76％。与Kjeldahl方法相比，Dumas方法具有显着更大的值（P <0.001）。对于鱼粉，杜马N的凯氏定氮N = 0.989（P <0.001）。色氨酸观察到相似的比例差异（Dumas N为0.984）。大多数实验室未能通过凯氏定氮法正确测定烟酸。对于鱼粉，重复性和再现性的相对标准偏差分别为杜马斯1.48和2.01％，凯氏定氮仪的1.62和2.37％。在两个实验室中进行的一次分析，用杜马斯测量的平均值相差不得超过平均值的5.63％，凯氏定氮法的平均值相差不得超过6.64％。结论是，用鱼粉比凯氏定氮法提供了更可靠的有机氮测量方法，因此，应选择杜氏法。

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