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Measuring method of arsenic in food, health care product and biological sample

A technology for biological samples and determination methods, which is applied in material excitation analysis, fluorescence/phosphorescence, etc., can solve the problems of large amount of reagents, prone to carbonization, and long time required for dry ash method, and achieves the effect of low accuracy

Inactive Publication Date: 2004-02-18
济南市疾病预防控制中心
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Problems solved by technology

However, in the sample processing part of this method, there are only wet digestion method and dry ash method. Wet digestion methods include nitric acid-sulfuric acid method and nitric acid-sulfuric acid-perchloric acid method. Among these two methods, wet digestion method requires a large amount of reagents, and the digestion process Carbonization is easy to occur in the medium, which reduces the arsenic content. The dry ash method takes a long time, consumes electricity and time, and has a high blank value.

Method used

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  • Measuring method of arsenic in food, health care product and biological sample
  • Measuring method of arsenic in food, health care product and biological sample
  • Measuring method of arsenic in food, health care product and biological sample

Examples

Experimental program
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Effect test

Embodiment 1

[0047] 1. Instruments and reagents: MARS5 microwave digestion instrument (CEM, USA); AF-610A atomic fluorescence spectrometer (Beijing Rayleigh Analytical Instrument Company); AE-240 automatic electronic analytical balance (Switzerland); KY-AF arsenic hollow cathode Lamp (Beijing, Chaoyang Tiangong Electric Factory). Superior pure nitric acid (ρ20=1.42g / ml); superior pure 30% hydrogen peroxide; arsenic standard solution 1mg / mL (National Standard Materials Research Center); arsenic standard use solution 1μg / ml: volume fraction before use Dilute 4% nitric acid step by step to 1μg / mL; 15g / L potassium borohydride solution: Dissolve 15g of analytically pure potassium borohydride in 2g / L potassium hydroxide solution, and prepare immediately after use; 150g reducing agent / L thiourea-100g / L ascorbic acid mixed solution, ready-to-use and ready-to-use; the experimental water is deionized water.

[0048] 2. Sample treatment: Accurately weigh 0.3g of Yasia brand Qingzhibao capsule (Jina...

Embodiment 2

[0051] As described in Example 1, the difference is that the sample is Kangshoumei brand life function source oral liquid, 1ml of the sample is extracted, and the measurement result is 0.12mg / L.

Embodiment 3

[0053] As described in Example 1, the difference is that the sample is Wangwang brand aftertaste broad bean, the sample is accurately weighed 0.5g, and the measurement result is 0.11mg / Kg.

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Abstract

A method for detecting the As in food, health-care food, or biological specimen includes dissolving the specimen in nitric acid and hydrogenperoxide mixture under action of microwave, adding the mixed solution of 150 g / L thiourea and 100g / L VC, mixing, taking 25ml solution laying aside at orinary temp for 40-50 min, and atomic spectrofluorimetry. Its advantages are high speed, correctness and sensitivity.

Description

(1) Technical field [0001] The invention relates to a method for directly measuring the content of arsenic in various foods, health products and biological samples by using microwave digestion, which belongs to the technical field of physical and chemical testing, and specifically relates to the technical field of trace element determination. (2) Background technology [0002] The determination of arsenic is usually carried out by spectrophotometry, hydride generation atomic absorption spectrophotometry, hydride generation atomic fluorescence spectrometry, polarography and arsenic spot method, among which non-dispersive atomic fluorescence technology has developed rapidly in my country since the 1980s. Fast, become a new trace analysis technique. For example, "Food Hygienic Physical and Chemical Inspection Standard Manual" edited by Yang Huifen, China Standard Press, 1998: 92-95, has listed hydride atomic fluorescence spectrometry for the determination of arsenic in food as a...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 刘素华翟明霞刘岚铮李自强王兴国胡光春刘仲
Owner 济南市疾病预防控制中心
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