Method for measuring harmful elements of lead, arsenic, cadmium, copper and chromium in eucalyptus oil food additive

Abstract

The invention belongs to the field of chemistry and is suitable for measuring the harmful elements of lead, arsenic, cadmium, copper and chromium in a eucalyptus oil food additive. The measuring method comprises the following steps of: firstly, quantitatively splitting a sample of the eucalyptus oil food additive and placing the sample into a polytetrafluoroethylene digester of a microwave digestion instrument; secondly, digesting the sample by adding 40-50mL of nitric acid-peroxide into each 10mL of the sample of the eucalyptus oil food additive; thirdly, taking off a sample solution to cool, release pressure and discharge waste gas and adding ultrapure water to 50mL; fourthly, using 4 percent nitric acid to dilute lead, arsenic, cadmium, copper and chromium of a national standard stock solution (GBW) into standard solution mixing liquid with concentrations of 0.00microgram / L, 2.50microgram / L, 5.00microgram / L, 10.00microgram / L, 20.00microgram / L and 30.00microgram / L step by step, measuring ion abundance by using an ICP-MS (Inductively Coupled Plasma-Mass Spectroscopy) instrument, and with the concentrations as traverse coordinate and the ion abundance as longitudinal coordinate, automatically drawing an element calibration curve by a computer; and fifthly, measuring the ion abundance of the lead, the arsenic, the cadmium, the copper and the chromium in the sample solution of the third step and calculating the content of each element.

Description

technical field [0001] The invention belongs to the chemical field and is suitable for the determination of harmful elements lead, arsenic, cadmium, copper and chromium in food additive eucalyptus oil. Background technique [0002] Eucalyptus oil is a natural fragrance oil extracted from the green leaves and branches of blue eucalyptus, eucalyptus and other plants by steam distillation. It is widely used in food, cosmetics and medicine. Lemon eucalyptus oil is mainly used in fragrances and daily chemical products to produce synthetic fragrances, menthol, thymol, essence, etc. Rose alcohol and limonol separated from lemon eucalyptus oil are used to prepare perfumes, soaps, essential oils, Prickly heat powder, etc. Eucalyptus blue oil is mostly used in medicine, has broad-spectrum antibacterial effect, has curative effect on respiratory tract infection, chronic bronchitis, etc., has expectorant effect, and can treat tuberculosis, etc. Eucalyptus blue oil can also be used for ...

AI Technical Summary

Problems solved by technology

[0004] Since the content of heavy metals in eucalyptus oil, a food additive, is far less than 1mg / kg, some of them reach 1μg / kg (μg / L) or even lower, reaching a trace level, which is lower than the "Limit Test of Heavy Metals in Food Additives" (GB / T 5009.74 -2003) or other methods detection limit several times or even hundreds of times, the existing standards and methods cannot accurately measure the heavy metal content in the food additive eucalyptus oil

In addition to lead and arsenic, the food additive eucalyptus oil also contains other harmful elements, such as cadmium, chromium, copper, etc. The content of heavy metals represented by lead and arsenic is not comprehensive, and the determination of other harmful elements needs to be solved

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