Method for determining lead content in rapeseed oil

A technology of lead content and rapeseed oil, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems that the method of lead content cannot be applied to detection, etc. The effect of light health hazard, high sensitivity, and easy operation

Inactive Publication Date: 2015-11-25
CHENGDU AIBIKE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, the method of measuring the lead content in rapeseed oil reported in the literature cannot be applied to the detection of general la

Method used

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Experimental program
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Embodiment

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

[0020] (1) Prepare 0.1% 10-phenanthroline solution, citric acid, EDTA mixture, 0.1% musmol blue indicator and 1:1 ammonia water;

[0021] (2) Prepare lead standard solution;

[0022] (3) Draw lead standard dilutions 0.0, 0.4, 0.8, 1.2, 1.6, 2.0 into 125mL into a separatory funnel, add 10mL of 20% ammonium citrate and 5% EDTA mixed solution, drop two drops of vanilla Phenol blue indicator, adjust to light blue with 1:1 ammonia water, add water to 40mL, add 5mL lead reagent, mix well, add 10mL carbon tetrachloride, stopper and shake for 2 minutes, let stand and separate, the lower layer Carbon tetrachloride is filtered with a small amount of absorbent cotton in a 10mL colorimetric tube. Set zero with zero tube, measure the absorbance with a 1cm colorimetric cell at 440nm, take the lead content as the abscissa, and the absorbance as the ordinate to make a lead standard curve;

[0023] (4) Weigh rapeseed ...

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Abstract

The invention discloses a method for determining the lead content in rapeseed oil. The method for determining the lead content in the rapeseed oil comprises the following steps that 1, a 10-phenanthroline solution, a hydroxylammonium chloride solution and a 0.1% thymol blue indicator are prepared; 2, a lead standard solution is prepared; 3, the double-lead content is regarded as an x-coordinate and the absorbance is regarded as a y-coordinate to make a lead 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 lead marking curve is made as the step 3. The method for determining the lead 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 determining the lead 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 of lead pollutants and its determination methods. International food regulations and standards (FAO / CAC) regard lead as a pollutant in edible oils and fats. Judgment indicators, and stipulated the maximum limit in rapeseed oil. The methods reported in the past to measure the lead content in rapeseed oil cannot be applied to the detection of ordinary laboratory personnel, especially some require the use of atomic absorption spectrophotometers, which cannot be done by ordinary laboratory personnel. Contents of the invention [0003] The purpose of the present invention is to provide a method for determining the lead content in rapeseed oil tha...

Claims

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Application Information

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IPC IPC(8): G01N21/79
Inventor 何金蓉周洁
Owner CHENGDU AIBIKE BIOTECH
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