METHOD OF MEASURING WEIGHT CONCENTRATIONS OF ARSENIC, CADMIUM, LEAD, MERCURY IN MEAT AND MEAT-CONTAINING PRODUCTS BY MASS SPECTROMETRY WITH INDUCTIVELY COUPLED PLASMA Russian patent published in 2020 - IPC G01N33/12 

FIELD: chemistry.

SUBSTANCE: invention relates to analytical chemistry and can be used for laboratory safety studies of meat and meat-containing products for presence of heavy metals. Method is followed by sampling after sampling to add thereto 10 cm³ of concentrated nitric acid in amount of 0.8-1.2 g of sample. Sample is decomposed at pressure of 4 mPa in two steps: at the first stage at temperature of 170°C for 5 minutes, and at second step at 200°C for 20 minutes. Resulting mineralizate quantitatively transferred to a volumetric flask of 100 cm³, the volume was adjusted to 100 cm³ of deionized water, stirred to give the prepared sample. Measurement sample prepared in the specific metal content in the mass spectrometer is carried out using a reaction/collision cell by passing helium through it as a gas-reactant at rate of 4.2-4.5 cm³/min and preliminary introduction into prepared sample of internal standard solution in volume ratio sample: standard as 1:0.01, wherein at said measurement of mercury content in said prepared sample, an internal standard used is a solution with a rhodium comparison element, and when determining arsenic, cadmium, lead, complex internal standard solution with comparison elements: germanium, indium, terbium.

EFFECT: high sensitivity, accuracy and rapidity of analysis.

1 cl, 12 tbl, 4 dwg