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Measurement method for total chlorine content in oil

A technology of total chlorine content and determination method, which is used in measuring devices, material analysis by electromagnetic means, instruments, etc., can solve the problems of inability to accurately measure samples with low chlorine content, difficult to meet the rapid detection of oil samples, and complicated operations. , to avoid the possibility of pollution, easy operation, simple pretreatment effect

Inactive Publication Date: 2013-05-01
SHANGHAI LIANGYOU GRP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the ion chromatography is used to determine the total chlorine content, the oxygen bomb combustion method is used to pre-treat the oil, which has the disadvantages of complicated operation, long time consumption, poor reproducibility, etc., and it cannot accurately measure samples with low chlorine content, and it is difficult to meet the rapid processing of a large number of oil samples. detection

Method used

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  • Measurement method for total chlorine content in oil
  • Measurement method for total chlorine content in oil
  • Measurement method for total chlorine content in oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Testing instrument: multi EA5000 multi-element analyzer from Jena Company, Germany;

[0029] Sampler: MMS5000 multifunctional automatic sampler;

[0030] Detector: high-sensitivity chlorine detector (lower detection limit is 10ng)

[0031] The detection conditions are: the injection volume is 100 μL; the carrier gas is high-purity Ar, and the flow rate is 100 mL / min; 2 Flow rate 300mL / min; secondary combustion O 2 The flow rate is 100mL / min; the furnace temperature is 1050°C; the integration time is 1200s; the number of parallel measurements is 3-5 times; the maximum variation coefficient is 5%.

[0032] The detection process includes the following steps:

[0033] (1) Dilute 8 kinds of qualified edible vegetable oils with isooctane at a volume ratio of 1:1, mix well, and set aside for use, and use isooctane as a blank solution; because isooctane is a diluent for diluting samples, the isooctane The amount of chlorine contained in the octane dilution, which is the tru...

Embodiment 2

[0041] Detection condition is the same as embodiment 1

[0042] The detection process includes the following steps:

[0043] (1) Dilute 8 kinds of kitchen waste oil and fat samples with isooctane at a volume ratio of 1:1, mix well, and set aside for use, and use isooctane as a blank solution;

[0044] (2) Prepare standard solutions of 2,4,6-trichlorophenol with isooctane as solvent: 5mg / L, 10mg / mL, 30mg / L;

[0045] (3) Detect the electric charge integral of the above standard solution, and draw the standard curve of electric charge integral-chlorine volume concentration (μg / 100μL), such as figure 2 As shown, the linear equation is obtained by performing linear regression on the standard curve: y=1.058×10 -3 x+4.071×10 -2 ; 2 =0.99997;

[0046] (4) Detect the electricity integral of the oil sample to be tested, and calculate the total chlorine in the oil sample to be tested according to the standard curve obtained in step (3)

[0047] content.

[0048] The test results ...

Embodiment 3

[0052] Detection condition is the same as embodiment 1

[0053] The detection process includes the following steps:

[0054](1) Dilute 5 kinds of kitchen waste oil and 5 kinds of edible vegetable oil samples with isooctane at a volume ratio of 1:1, mix well, and set aside for use, and use isooctane as a blank solution;

[0055] (2) Prepare standard solutions of 2,4,6-trichlorophenol with isooctane as solvent: 100ng / mL, 500ng / mL, 1mg / L, 5mg / L, 10mg / mL, 30mg / L;

[0056] (3) Detect the electric charge integral of the above standard solution, and draw the standard curve of electric charge integral-chlorine volume concentration (μg / 100μL), such as figure 1 , 2 As shown, the linear equation was obtained by performing linear regression on the standard curve. When the standard solution concentration is 100ng / mL, 500ng / mL, 1mg / L, 5mg / L, the corresponding standard curve is: y 1 =1.227×10 -3 x–1.601×10 -2 , R 2 =0.99969; when the standard solution concentration is 5mg / L, 10mg / mL, ...

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Abstract

The invention relates to a measurement method for total chlorine content in oil. Firstly, 2, 4, 6-trichlorophenol standard solution is prepared; then, a multiEA5000 type multi-element analyzer is used for detecting; standard curves of electric quantity integrals and total chlorine volume concentrations are drawn; and after an oil sample to be measured is detected, the regression calculation is implemented through the standard curves to obtain the total chlorine content in the oil to be measured. The measurement method for the total chlorine content in the oil has the advantages of simplicity, accuracy in measurement and high detection sensitivity, and provides a novel screening method for identifying dining room-kitchen waste oil and proper edible oil.

Description

technical field [0001] The invention relates to a method for determining the total chlorine content in fats and oils, belonging to the technical field of food detection. Background technique [0002] Kitchen waste oil refers to the oil extracted from kitchen waste, including swill oil, roast duck oil, and old frying oil that has been repeatedly used for more than the specified number of times, which belongs to the category of waste oil. [0003] Some lawbreakers reprocess kitchen waste oil and return it to the dining table as edible oil. Long-term consumption of these inferior oils will cause cell function failure, induce various diseases, and even cause cancer. Therefore, these waste oils pose a serious threat to food safety. Great harm. Since the total chlorine content in kitchen waste oil is much higher than that in normal edible vegetable oil, most of the chlorine exists in the form of organic matter in kitchen waste oil after high temperature, which is difficult to be ...

Claims

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Application Information

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IPC IPC(8): G01N27/62
Inventor 陈凤香包杰薛斌方东梅沙德仁
Owner SHANGHAI LIANGYOU GRP
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