Direct determination of particulate elements in edible oils and fats using an ultrasonic slurry sampler with graphite furnace atomic absorption spectrometry Van Dalen, G.; De Galan, L. Spectrochimica Acta. Part B : Atomic Spectroscopy 49(12-14): 1689-1693 1994 https://eurekamag.com/research/074/902/074902056.php