Preparation and characterization of new reference material for inorganic analysis of pumpkin seed flour - An interlaboratory program.

This work describes preparing a certified reference material for pumpkin seed flour for use in inorganic analyses of vegetable foods. The elements studied were potassium, magnesium, phosphorus, zinc, copper, iron, manganese, and calcium. The ISO Guides were employed in the homogeneity and stability tests, interlaboratory program, and assignment of uncertainty value.