Microwave-assisted digestion using diluted acid was developed for nutrient elements (Mn, Fe, Co, Cu, Zn and Sr) determination in brown sugar samples by inductively coupled plasma mass spectrometry (ICP-MS). The effects of different digestion conditions including HNO3 concentration, the volume of H2O2 and digestion time on the recoveries of elements were investigated by single factor experiment, and the optimum digestion conditions were obtained. The results showed that the optimum digestion conditions of microwave-assisted digestion using diluted acid were as follows: concentration of 1 mol/L HNO3, 1.0 mL of H2O2 and digestion for 27 min. The standard curve of each element was exhibited a good linear correlation with a coefficient higher than 0.999 5. The limits of detection (LODs) of 6 elements were 0.001-0.05 mg/kg, and the limits of quantification (LOQs) were 0.004-0.2 mg/kg. Moreover, the relative standard deviation (RSD) was less than 5%. Suitable recoveries (range from 87.5% to 110.2%) were obtained in three evaluations for all analytes. After the comparation with those obtained by the national standard method of China, and no statistical differences were observed (student′s t-test, confidence level of 95%, P＞0.05). The proposed method is simple, high sensitivity and accurate, which is suitable for the determination of the Mn, Fe, Co, Cu, Zn and Sr in brown sugar samples.
YANG Wei
,
LI Rong
,
FAN Xiaoxu
,
YANG Chunhua
,
ZHOU Meili
. Microwave-assisted digestion using diluted acid for six nutrient elements determination in brown sugar by inductively coupled plasma mass spectrometry[J]. Food and Fermentation Industries, 2021
, 47(24)
: 261
-264
.
DOI: 10.13995/j.cnki.11-1802/ts.027437
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