A method for determining Na, Mg, K, Ca, Mn, Ni, Cu, Zn, As, Sr, Cd, Ba and Pb in Ottelia acuminate by ICP-MS combined with rapid graphite digestion was established in this study. The rapid graphite digestion condition was optimized single factor test, 45Sc,72Ge,115In and 209Bi were used as internal standard elements, and the content of each element was simultaneously determined by ICP-MS. The optimum condition of rapid graphite digestion was as follows: used 2.0 mL nitric acid and 1.0 mL hydrogen peroxide, and digested at 120 ℃ for 20 min. The linear ranges of Na, Mg, K and Ca were 0-10 mg/L, of Mn, Ni, Cu, Zn, As, Sr, Cd, Ba and Pb were 0-0.3 mg/L, and the correlation coefficients were all higher than 0.999 5. The detection limits and quantification limits of the elements were in the range of 0.000 6-0.670 1 mg/kg and 0.002 0-2.233 8 mg/kg, respectively. The relative standard deviation of the method was between 0.34% and 5.31%, and the recovery rate was 87.6%-108.5%. The contents of these 13 elements in national standard material (GBW10025) were in the range of reference values by applying the established method. In conclusion, this method is simple, fast, accurate and reliable, which can be used for analyzing multielement in plant samples.
YANG Chunhua
,
BI Jianliang
,
ZHOU Meili
,
YANG Wei
,
FAN Xiaoxu
. Determination of 13 inorganic elements in Ottelia acuminate by ICP-MS and rapid graphite digestion[J]. Food and Fermentation Industries, 2019
, 45(16)
: 281
-285
.
DOI: 10.13995/j.cnki.11-1802/ts.020587
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