Determination of Zinc in Milk by Atomic Absorption Spectrometry

• 1、School of Chemical Engineering and Technology, China University of Mining and Technology

Abstract：Milk is a very important nutrition in children's daily life. The milk, adding some trace elements necessary for the human body, is a very popular measures to complement trace elements, so to talk about the content of zinc in milk and to measure the quality of milk products of plus zinc are very important. In this paper, determining zinc in milk by Air-acetylene Flame Atomic Absorption Spectrometry, and before this, the sample is dealt with the dilution of 0.75mol/L nitric acid method, dilution-ultrasonic method and national standard method. By comparison, the samples were diluted with ultrasonic method do not affect the determination result. The pre-treatment with 0.75mol/L nitric acid is simple, fast, because it overcomes the shortcomings of cumbersome and time-consuming present in various methods, and the result is accurate. The recovery is 104.0%, linear correlation coefficient is 0.9982, relative standard deviation is 0.61% and the detection limit is 0.00162μg/ml.

Keywords： Atomic absorption spectrometry Milk Zinc