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Rapid determination method for arsenic in aquatic products

A technology for rapid determination and aquatic products, applied in the direction of material excitation analysis, fluorescence/phosphorescence, etc., to achieve the effect of making up for the long cycle of detection results, avoiding strong acid pollution, and choosing reasonable experimental conditions

Active Publication Date: 2015-09-16
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no standard for the rapid detection method for the determination of arsenic in aquatic products in the international ISO and CAC standards

Method used

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  • Rapid determination method for arsenic in aquatic products
  • Rapid determination method for arsenic in aquatic products
  • Rapid determination method for arsenic in aquatic products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: Determination of As in yellow croaker:

[0034] A method for rapid determination of arsenic in aquatic products, comprising: 1) selected instruments and equipment, 2) preparation of a standard curve, 3) test steps, 4) instrument conditions used in experiments, and 5) result calculation and expression;

[0035] 1) Instruments and equipment: DAA-5300 (Direct Arsenic Analyzer) and atomic fluorescence spectrometer combined system:

[0036] (1) Direct sampling arsenic measurement device: model DAA-5300, equipped with quartz sample boat, gas circuit control system, two tube furnaces, electric heating quartz tube, and coated electric heating quartz tube;

[0037] (2) Atomic fluorescence spectrometer (AFS): Model 8230, equipped with photomultiplier tube (PMT) negative high pressure, arsenic hollow cathode lamp, detector, gas circuit control system;

[0038] (3) Mixed gas of hydrogen and argon (15%+85%).

[0039] 2) Preparation of the standard curve: Take the sta...

Embodiment 2

[0061] Example 2: Determination of As in scallops:

[0062] Mix the scallop standard substance (GBW10024) and alumina at 1:10 evenly, weigh about 15.0 mg of the mixed sample and put it into the quartz sampling boat, and then place the quartz sampling boat directly into the arsenic measuring device and atomic The value of arsenic was determined in the fluorescence combined instrument; other conditions were the same as those of yellow croaker, and the determination results of the recovery rate of the scallop standard material (see Table 3).

[0063] Table 3. Determination results of As recovery rate in scallop standard material

[0064]

[0065]

[0066] It can be seen from Table 3: we measured the recovery rate of As in the scallop standard material in 86.11-90.83%, and the recovery effect is ideal.

Embodiment 3

[0067] Example 3: Determination of As in clams:

[0068] Shell the clams. Mix the mashed meat homogenate with alumina at a ratio of 1:10. Weigh about 40.0 mg of the mixed sample and put it into a quartz injection boat, and then place the quartz injection boat into the arsenic measurement device. Determination of arsenic value with atomic fluorescence (AFS) combined instrument; in addition, weigh 500 mg of the above mixed sample, add 100 mg and 300 mg of seaweed standard material containing As content of 1000 ng / g and mix well, which is equivalent to adding a standard of 1.67 mg / kg and 3.75mg / kg As, weigh about 20.0mg and put it into a quartz sample boat, set the direct injection measuring device and the atomic fluorescence spectrometer to measure the value of As; other conditions are the same as those of yellow croaker, The determination results of the recovery of As in clams (see Table 4).

[0069] Table 4. Determination results of As recovery rate in clams

[0070]

[0...

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Abstract

The invention discloses a rapid determination method for arsenic in aquatic products and belongs to a detection technology for aquatic products. The method comprises the following steps: (1) selecting instruments and equipment; (2) preparing a standard curve; (3) testing; (4) setting the instrument conditions for the experiment; and (5) calculating and expressing results. According to the rapid determination method, detection data is accurate and reliable; arsenic in aquatic products can be subjected to direct solid sampling determination without digestion and acid driving; meanwhile, pollution of a strong acid is avoided; the defects of detection data distortion and long detection result period caused by incomplete digestion in an existing national standard method are overcome; the detection time is shortened to 0.1 hour from more than fifty hours in an existing standard; the requirements for implementing supervision on the determination effectiveness for the total arsenic content in the aquatic products are met; and the rapid determination method has the characteristics of high detection speed on the arsenic content in the aquatic products and high quality supervision timeliness.

Description

technical field [0001] The invention belongs to the detection technology of aquatic products, in particular to a rapid determination method of arsenic in aquatic products. Background technique [0002] The 72nd meeting of the Joint Expert Committee on Food Additives of the United Nations Food and Agriculture Organization and the World Health Organization (JECFA) conducted a comprehensive evaluation of the toxicity of arsenic and arsenic compounds in the risk assessment report of arsenic (As) exposure in food, and re-evaluated and proposed weekly Tolerable Intake Value (PTWI). Based on the mean exposure, after an average of 11.5 years of follow-up, the committee proposed a minimum baseline daily dose (BMD) for a 0.5% increase in cancer incidence from background values 0.5 ) was 3.0 μg / kg b.W., and the sensitivity survey analysis of the uncertainty affecting exposure assessment showed that the BMD 0.5 Lower limit value (BMDL 0.5 ) is 2.0 to 7.0 μg / kg b.w. per day. [0003]...

Claims

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Application Information

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IPC IPC(8): G01N21/64
Inventor 尚德荣翟毓秀赵艳芳宁劲松盛晓风丁海燕
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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