Abstract:

A new method of indirect acid titration was developed for the determination of aluminum content in poultry meat and viscera. In this method, samples were wet-digested, and the digestion solution, of which pH ranged 7–8, was sequentially added with sodium tartrate for masking Fe3+ and diluted NaOH solution for precipitating total Al3+ into Al(OH)3. In the following, potassium fluoride was added and dissociated KOH was titrated using HCl standard solution to the end point with phenolphthalein as the indicator. This method is characteristic of simpleness, quickness and less disturbance. Furthermore, it also exhibits good precision, accuracy and reproducibility. The relative standard deviation (RSD) of this method was less than 2.5% and the spike recovery rates were between 96.6% and 99.5%. The precision and accuracy were in good agreement of those of the Chinese National Standard method, with a RSD of less than 3.0%.

Key words: acid titration, poultry organizations, aluminum