XÁC ĐỊNH VI LƯỢNG ĐẤT HIẾM TRONG CHẾ PHẨM THỨC ĂN CHĂN NUÔI BẰNG PHƯƠNG PHÁP ICP-MS

Tóm tắt

The concentration of trace rare earth elements (REEs) in breeding feed samples, which were collected
from the experimentally in vivo tests with the poultry and fish was determined by using ICP-MS under
the identical conditions.
115In internal standard was used for the measurement on ICP-MS in order to
eliminate of the sample matrix effect. The fine ground samples were ashed at about 650
oC in a stove and
digested in a mixture of HNO3 and H2O2 on the hot plate, then followed by the evaporation until the moist
residue obtained. The residue was dissolved in 2% (v/v) HNO3 for ICP-MS measurement. The analytical
results from raw material of feeding products showed that the average value of total rare earth elements
ΣREE content was within 3 to 5 g/kg, meeting the product quality requirements. The analytical procedure
has been validated through the addition of rare earth standards into a commercial sample and via a
standard reference material (SRM), which have shown the good agreement with detection limits of the
method (MDL). It can thus be applied to the analysis of trace rare earth elements in breeding feed
samples. This isthe first study to aim at establishing a standard procedure (SOP) to analyze the individual
REEs traces in breeding feed for supporting the application of the organic REEs compounds in
agriculture.