Abstract
In this study, a method for bromine and iodine determination in rice by inductively coupled plasma mass spectrometry (ICP-MS) after digestion by microwave-induced combustion (MIC) was developed. Samples (up to 1000 mg) were digested in closed system pressurized with oxygen. Ultrapure water and NH4OH solutions were evaluated as absorbing solution. Recoveries from 98 to 108% were obtained for Br and I using 50 mmol L−1 NH4OH, and the relative standard deviations (RSDs) were up to 9 and 11% for Br and I, respectively. Limits of detection (LODs) of 0.004 and 0.0008 mg kg−1 for Br and I, respectively, were obtained. These LODs were lower than those reported in the literature, and it was possible due to the high sample mass digested by MIC associated with the detection capability of ICP-MS. The proposed method was applied to 23 samples of rice from different countries and types. The results showed a wide variation for Br concentrations (0.304 to 55.7 mg kg−1), whereas for I it was not observed (<0.003 to 0.031 mg kg−1). In this way, the proposed method presents several advantages for the routine analysis and indicate that it is an excellent alternative for Br and I determination in rice.
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