The already partitioned Amaranthus caudatus (spinach) was dried in the oven at 60ºC for 10 hours, then ground and powdered with a mortar. The powdered sample (1 g) was digested using a mixture of concentrated nitric and perchloric acids [10].
The already partitioned Amaranthus caudatus (spinach) was dried in the oven at 60ºC for 10 hours, then ground and powdered with a mortar. The powdered sample (1 g) was digested using a mixture of concentrated nitric and perchloricacids [10].