Method for determining mercury content in rapeseed oil

A technology of rapeseed oil and content, applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems that the method of mercury content can not be applied to detection, etc., to achieve light harm to human health, easy operation, and small pollution Effect

Inactive Publication Date: 2015-11-25
CHENGDU AIBIKE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

The method of measuring mercury content in rapeseed oil reported in the literature in the past cannot be applied to the detection of general lab

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment

[0019] The main implementation steps of this embodiment are as follows:

[0020] (1) Prepare 0.1% sodium diethylaminothioformate, 10% hydroxyamine hydrochloride solution and sodium acetate buffer solution;

[0021] (2) Prepare mercury standard solution;

[0022] (3) Take mercury standard dilutions 0.0, 0.4, 0.8, 1.2, 1.6, and 2.0 into 25mL colorimetric tubes, add hydrochloric acid and amine solution 2mL respectively, adjust to zero with the zero tube, and use a 3cm colorimetric tank at a wavelength of 510nm Measure the absorbance, the double mercury content is the abscissa, and the absorbance is the ordinate to make a mercury standard curve;

[0023] (4) Weigh 25~30g of rapeseed oil into a 250mL Erlenmeyer flask, add 20mL of concentrated hydrochloric acid, 15mL of water and a few glass beads, boil for 1 hour under reflux on the electric heating mantle, transfer it to a 125mL separatory funnel after cooling slightly, and let it stand After layering, filter the acid extract fr...

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PUM

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Abstract

The invention discloses a method for determining the mercury content in rapeseed oil. The method for determining the mercury content in the rapeseed oil comprises the following steps that 1, a 10-phenanthroline solution, a hydroxylammonium chloride solution and a sodium acetate buffer solution are prepared; 2, a mercury standard solution is prepared; 3, the double-mercury content is regarded as an x-coordinate and the absorbance is regarded as a y-coordinate to make a mercury standard curve; 4, the rapeseed oil is weighed, concentrated hydrochloric acid, water and glass beads are added, reflux boiling is performed, lower-layer acid extract liquid is filtered by double-layer filter paper after standing and layering, filtrate is fed into a beaker, a conical flask is cleaned, the liquid is poured into a funnel and then is mixed with the filtrate in the beaker after layering, the filter paper is flushed, drying by distillation is performed, and water is added for constant volume so as to obtain a liquid sample; 5, the liquid sample obtained in the step 4 is absorbed in a colorimetric tube, and a mercury marking curve is made as the step 3. The method for determining the mercury content in the rapeseed oil is quick, accurate, simple and convenient to operate, high in sensitivity and smaller in environment pollution, does not use a highly toxic agent, has a minor hazard to human health and can meet the testing demands of ordinary experimenters.

Description

technical field [0001] The invention relates to the field of detection of heavy metals in edible oil, in particular to a method for measuring mercury content in rapeseed oil. Background technique [0002] At present, the second-grade rapeseed oil consumed in my country is unrefined crude oil, and there are few reports on the content and determination methods of mercury pollutants. Mercury is listed as a pollutant in edible oils and fats in international food regulations and standards (FAO / CAC). Judgment indicators, and stipulated the maximum limit in rapeseed oil. In the past, the method of measuring mercury content in rapeseed oil reported in the literature cannot be applied to the detection of general laboratory personnel, especially some require the use of atomic absorption spectrophotometer, which is simply impossible for general laboratory personnel. Contents of the invention [0003] The purpose of the present invention is to provide a rapid and accurate, easy to ope...

Claims

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Application Information

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IPC IPC(8): G01N21/31G01N1/28
Inventor 何金蓉周洁
Owner CHENGDU AIBIKE BIOTECH
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