Detection method for determining migration quantity of trace lead, cadmium, arsenic and antimony in food contact material by sequential injection-HG-AFS method

Abstract

The invention relates to a detection method for determining the migration quantity of harmful elements in a food contact material, especially to a detection method for determining the migration quantity of lead, cadmium, arsenic and antimony in a food contact material by the sequential injection-hydride generation-atomic fluorescence spectroscopy (HG-AFS) method. The method provided by the invention comprises the following steps of: 1, migration test; 2, food simulacrum test solution treatment; 3, blank test; 4, sequential injection-hydride generation-atomic fluorescence spectroscopy determination. By the adoption of L-cysteine as a pre-reducing agent or by the adoption of a direct dilution method to eliminate severe inhibition and interference of 4% acetate base to the determination of lead and cadmium by an atomic fluorescence method, the migration quantity of arsenic, antimony, lead and cadmium in a food contact material can be efficiently, simply and rapidly determined. The migration quantity of four harmful elements can be detected only by a simple pre-treatment. The detection limits of lead cadmium, cadmium, arsenic and antimony are respectively 0.010, 0.010, 0.010 and 0.010mg / L.

Description

technical field [0001] The invention relates to a detection method for the migration of harmful elements in food contact materials, in particular to a method for measuring the migration of lead, cadmium, arsenic and antimony in food contact materials using sequential injection-hydride generation-atomic fluorescence spectrometry (HG-AFS method) Quantitative detection method. Background technique [0002] The production methods of ceramic tableware are divided into three types: over-glaze color, in-glaze color and under-glaze color. Enamel is an inorganic glass enamel coated and fired on the surface of a metal base. The color glaze contains compounds harmful to human body such as lead, cadmium and antimony. The main components of stainless steel are iron, chromium, and nickel alloys. In addition, they also contain trace elements such as manganese, titanium, cobalt, arsenic, and cadmium, which make stainless steel stable, rust-resistant, and corrosion-resistant. Aluminum tab...

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Problems solved by technology

Among the methods mentioned above, the dithizone colorimetric method, diphenylcarbazide colorimetric method, diacetyl-contaminated colorimetric method, arsenic spot method, etc. have problems such as low sensitivity, cumbersome and time-consuming operation, and the use of toxic organic solvents. ; Flame atomic absorption spectrophotometry has problems such as low sensitivity and single element determination; graphite furnace atomic absorption method has problems such as cumbersome operation and single element determination; The sensitivity cannot meet the requirements of the migration limit of food contact materials and other problems; inductively coupled plasma mass spectrometry has problems such as expensive instruments, cumbersome and time-consuming operations; atomic fluorescence spectrophotometry has the advantages of high sensitivity, low price, simple and fast, etc., but domestic and foreign There are few reports on the sequential injection-hydride generation-atomic fluorescence spectrometry detection method for the migration of harmful elements lead, cadmium, arsenic and antimony in food contact materials. Arsenic (Ⅴ) and antimony (Ⅴ) are pre-reduced to arsenic (Ⅲ) and antimony (Ⅲ) under the condition of pre-reduction, and sequential injection-hydride generation-atomic fluorescence spectrometry is used to simultaneously determine the migration of arsenic and antimony in food contact materials; method to eliminate the serious interference of 4% acetic acid matrix on the determination of lead and cadmium by atomic fluorescence method, using potassium ferricyanide as oxidant-sequential injection-hydrogenation-atomic fluorescence spectrometry to determine the amount of lead migration in food contact materials, and Cobalt and thiourea as sensitizers - sequential injection - hydride generation - atomic fluorescence spectrometry for the determination of cadmium migration in food contact materials has not been reported

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