A Study on Qualitative and Quantitative Analysis Methods of Added Mineral in Feed Products
In this study,we develop a qualitative and quantitative detection method for added minerals in feed products.The approach utilizes X-ray diffraction(XRD)to identify the types of added minerals,and inductively coupled plasma emission spectroscopy(ICP)for quantification.The sample was ashed in muffle furnace,and the mineral components in the resulting ash were analyzed using XRD.Another set of samples was placed in centrifuge tubes,and a solution of(1+5,v/v)formic acid was added for shaking extraction.After purification by centrifugation,the upper clear liquid was filtered through a 0.22 μm membrane,diluted with water,and analyzed using ICP.Quantification employs an external standard method,and the mineral content was deduced based on XRD results.The study validates the method using samples with added calcium carbonate and magnesium carbonate.Results indicate that the XRD detection limit can identify added minerals at a concentration as low as 0.1%.In the ICP quantitative method,calcium and magnesium exhibit good linearity in the concentration range of 0.1 mg/L to 10.0 mg/L,with linear regression coefficients(r2)greater than 0.9997.The recovery rates for spiked blank samples range from 86.7%to 102%,and the relative standard deviations(RSD,n = 6)are between 0.6%and 1.8%.The method proves to be accurate and efficient,with simple pre-treatment operations.It can accurately determine the mineral content in feed products and has been successfully applied to both the testing of actual samples and customs classification analysis.
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