Determination of Major and Trace Metals in Date Palm Fruit (Phoenix dactylifera) Samples Using Flame Atomic Absorption Spectrometry and Assessment of the Associated Public Health Risks

Table 1

Optimization of reagent volume for the digestion of 0.5 g of date palm fruit samples at a constant temperature and digestion time.

Reagent volume ratio (HNO3 : HClO4) (total volume = 4 mL)	Temperature (°C)	Digestion time (hrs)	Results (solution color)
2 : 1	300	3 : 00	Colorless and turbid
3 : 1	300	3 : 00	Clear and colorless solution
3 : 2	300	3 : 00	Colorless with suspension
4 : 2	300	3 : 00	Colorless with suspension
5 : 1	300	3 : 00	Slightly yellow
6 : 2	300	3 : 00	Colorless with suspension