I need to determine Pb in food samples by VARIAN 240FS AAS. What Is the best matrix modifier for the determination of Pb by VARIAN 240FS AA fast sequential atomic absorption? What type of chemical modifiers would you suggest?
I used to use concentrated nitic acid and mineralised my samples in microwave oven. Most of nitrates of different metals are easily soluable in water so it should provide you good recovery of lead.