The residual amount of aluminum in deep-fried dough sticks was determined by spectrophotometry.The sources of uncertainty affecting the measurement results were analyzed,the components of uncertainty were evaluated,and the synthesis and extended uncertainty were calculated.The results showed that when the residual amount of aluminum in deep-fried dough sticks sample was 60.13 mg·kg-1,the extended uncertainty was 3.69 mg·kg-1(k=2).The uncertainty introduced by aluminum calibration curve fitting,aluminum standard working solution preparation and measurement repeatability has great influence on measurement results.
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