determination by cold vapor atomic absorption spectrometry (CV AAS) and microwave-induced plasma
optical emission spectrometry (MIP OES), using a 10% (w/v) SnCl2 as reductant agent. Amulti-mode sample
introduction system(MSIS) was coupled to theMIP OES equipment to make possible the generation of mercury
vapor in the nebulizer chamber. The optimized protocol involved the treatment of 150 mg of fertilizer
with 4 mL of 30% (v/v) HCl inside glass tubes using a conventional ultrasonic bath for 5 min. Comparable
analytical results were obtained for mercury determined by both CV AAS and MIP OES,with better detection
limits for the latter technique. The proposed extraction procedure is simple and versatile, and contributes to
minimal generation of waste (low volume of diluted HCl) in comparison to the official method