Evaluation of Uncertainty in Spectrophotometric Determination of Nitrite in Chinese Cabbage

doi:10.7506/spkx1002-6630-201306046

FOOD SCIENCE ›› 2013, Vol. 34 ›› Issue (6): 208-210.doi: 10.7506/spkx1002-6630-201306046

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Evaluation of Uncertainty in Spectrophotometric Determination of Nitrite in Chinese Cabbage

HAO Xiao-li1，ZHAO Ying-bo2,*，CHEN Fang-fang1

1. Open Laboratory of Liaoning Academy of Agricultural Sciences, Shenyang 110161, China；2. Analysis and Testing Center, Shenyang Agricultural University, Shenyang 110866, China

Received:2011-11-28 Revised:2013-01-22 Online:2013-03-25 Published:2013-03-01

Abstract

Abstract: The sources of uncertainty in the spectrophotometric determination of nitrite in Chinese cabbage were investigated by analyzing whole determination procedure. Each uncertainty component was modeled, synthesized and developed a method for the evaluation of uncertainty in spectrophotometric determination of nitrite in Chinese cabbage. The uncertainty was attributed to four sources. The order of their impacts was measurement repeatability, nitrite mass determined by standard curve, sample dilution and sample weighting. The results of uncertainty evaluation showed the nitrite content to be (12.3 ± 1.08) mg/kg (k = 2).

Key words: nitrite, uncertainty, spectrophotometry

CLC Number:

TS201.1

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Evaluation of Uncertainty in Spectrophotometric Determination of Nitrite in Chinese Cabbage

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