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 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. The method comprises the following steps: 1. migration test; 2. treatment of food simulant test solution; 3. blank test; The present invention adopts L-cysteine ​​as the pre-reducing agent, or adopts the direct dilution method to eliminate the severe inhibition interference of 4% acetic acid matrix on the determination of lead and cadmium by atomic fluorescence method, and can efficiently, simply and quickly measure arsenic in food contact materials and the migration of antimony and the migration of lead and cadmium. The invention only needs simple pretreatment to detect the migration of four harmful elements, and the detection lower limits of lead, cadmium, arsenic and antimony are respectively 0.010, 0.010, 0.010 and 0.010 mg / 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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