CN104515741A - Method for qualitative detection of hogwash oil - Google Patents
Method for qualitative detection of hogwash oil Download PDFInfo
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- CN104515741A CN104515741A CN201410762207.2A CN201410762207A CN104515741A CN 104515741 A CN104515741 A CN 104515741A CN 201410762207 A CN201410762207 A CN 201410762207A CN 104515741 A CN104515741 A CN 104515741A
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Abstract
The invention discloses a method for qualitative detection of hogwash oil. The method includes determining the chlorine ion content of a sample by silver chloride turbidimetry, and if the chlorine ion content of the sample is larger than 2 microgram/mL, the sample can be determined as hogwash oil. The method provided by the invention is simple, can quickly and accurately identify hogwash oil, and has very important significance for containment of waste grease backflow to the market.
Description
Technical field
The present invention relates to a kind of method of qualitative detection hogwash fat.
Background technology
Hogwash fat is that the grease contained by catering trade waste residue is separated through pulp water, fishes for oil reservoir, and the grease then obtained through processing process such as dehydration, decolourings is rotten grease.Because grease interacts with some house refuses such as sewage, washing agent, heavy metal, microorganism in use and waste procedures, produce harmful material, simple refining processing can not to remove in grease the harmful chemical components such as impurity at all completely, if will to healthy generation great damage as edible oil, now studies have found that grease can produce trans-fatty acid when high-temperature heating, large quantity research confirms the effect of the health risks such as trans-fatty acid can increase the probability suffered from a heart complaint, Developing restraint growth.
At present GB2716-2005 edible vegetable oil hygienic standard is mainly relied on to grease superior and inferior evaluating standard, the moisture, acid value, peroxide value, carbonyl valency, iodine number, arsenic, aflatoxin B1, benzo (a) pyrene etc. of grease are detected.But lawless person mixes pseudo-technology quite maturation, if waste grease is processed through refining, is only difficult to judge that whether grease is qualified by these indexs.In order to effectively contain spreading unchecked of waste oil, guarantee the healthy of numerous people, be necessary the discrimination method of waste grease processed, supplementing as edible oil national standard, help supervision department and consumer to reflect waste grease, therefore, the waste grease physical and chemical index that different method for refining obtains is analyzed, work out method that is quick, effectively analysis and identification waste grease, help relevant department's containment waste grease backflow market to have very important meaning.
Summary of the invention
The technical problem to be solved in the present invention overcomes existing defect, provides a kind of method of qualitative detection hogwash fat.
In order to solve the problems of the technologies described above, the invention provides following technical scheme:
A method for qualitative detection hogwash fat, comprise the chloride ion content adopting determination of silver chloride turbidimetry sample, the chloride ion content of sample is greater than 2 μ g/mL and can be judged to be hogwash fat.
Further, the mensuration process of described chloride ion content is as follows: get a certain amount of sample and add a certain amount of water, heat after 10-30 minute, get a certain amount of water layer sample, add nitric acid and silver nitrate, after the constant volume that adds water, secretly put 10-30 minute, measure the absorbance at 400nm place, then drawn the chloride ion content of sample by the typical curve of chloride ion content-absorbance.
The inventive method is simple, can identify hogwash fat fast and accurately, has very important meaning for containment waste grease backflow market.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein is only for instruction and explanation of the present invention, is not intended to limit the present invention.
Accurately take 10g oil sample, add 50 mL distilled water, 100 DEG C add thermal agitation 20 min, and water layer is as solution to be measured.
Accurate absorption 1ml solution to be measured, 1mL salpeter solution, 5mL liquor argenti nitratis ophthalmicus, in 25mL color comparison tube, are settled to 25mL with distilled water, turn upside down for several times, in the dark place 25min, take out and turn upside down again for several times, be determined at wavelength 400 nm place after mixing and measure absorbance.Prepare blank sample solution simultaneously.
With sodium chloride series standard solution, measure absorbance as stated above, obtain typical curve, regression equation y=20.019x+0.0987, coefficient R
2=0.9991, x is absorbance, and y is chlorine ion concentration.
Adopt standard addition method, respectively to the sodium chloride standard solution adding 10.00,20.00,40.00,60.00 μ g/mL in qualified edible oil extract, each horizontal parallel surveys 6 times, experiment shows, the recovery of this method is 97 ~ 103%, relative standard deviation (RSD) is 2.3% ~ 4.5%, and measurement result meets analyzes requirement.
The chloride ion content of different sample
。Most of chlorion in hogwash fat can be removed by the known refining of testing result, in the hogwash fat of separate sources, chloride ion content difference is larger, but chloride ion content is still obvious far above qualified edible oil in each hogwash fat, illustrate that chloride ion content height can as one of index differentiating hogwash fat and qualified edible oil, in sample oil, chloride ion content can be judged to be hogwash fat higher than 2 μ g/mL.
Obtain hogwash fat respectively by different restaurant, obtain the oil sample of different disposal through following process:
(1) raw oil: by the swill floating thing fished for as in 1000mL beaker, with heating by electric cooker, maintain about 100 DEG C, heating is about after one hour, with the impurity that two-layer filtered through gauze removing is larger, then stratification, gets upper strata oil, lower floor, still containing more grease, adds in heating next time and continues to be separated.Merge oil reservoir and obtain raw oil.
(2) washing oil: the rough hogwash fat after heating and filtering is shaken up, takes 100g oil sample in 250mL beaker, add the distilled water of equal volume, as in 80 DEG C of water-baths, frequently stir (stir unsuitable violent, prevent emulsion from occurring), take out after 20min, transfer in separating funnel, discard lower aqueous layer after layering, get upper strata oil, repeat above operation twice, three times altogether, oil must be washed.
(3) alkali refining oil: slowly add the sodium hydroxide solution taken while stirring, Non-follow control stirring rate 60r/min, stir not easily violent.Neat soap is kept to 30r/min after occurring, after adding NaOH, bath switch of fetching boiling water, starts heating, and 60 DEG C of insulations leave standstill 12h(or directly turn off water-bath spends the night).Get upper strata oil, isolate soap stock (precipitation) and discard.Oil is heated to 75 DEG C of distilled water washings that 60 DEG C add volume fraction 20 ~ 30%, slowly stirs (preventing emulsification), transfer to after 30min in separating funnel, discard lower layer of water, wash 3 times altogether.
(4) refined oil: get alkali refining hogwash fat, takes out after reacting 20min, two-layer gauze suction filtration twice with the activated charcoal of massfraction 3% in 65 DEG C of water-baths.
Last it is noted that the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although with reference to previous embodiment to invention has been detailed description, for a person skilled in the art, it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. a method for qualitative detection hogwash fat, comprise the chloride ion content adopting determination of silver chloride turbidimetry sample, the chloride ion content of sample is greater than 2 μ g/mL and can be judged to be hogwash fat.
2. according to the method for claim 1 qualitative detection hogwash fat, it is characterized in that: the mensuration process of described chloride ion content is as follows: get a certain amount of sample and add a certain amount of water, heat after 10-30 minute, add nitric acid and silver nitrate, add water after constant volume, secretly put 10-30 minute, measure the absorbance at 400nm place, then drawn the chloride ion content of sample by the typical curve of chloride ion content-absorbance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762207.2A CN104515741A (en) | 2014-12-13 | 2014-12-13 | Method for qualitative detection of hogwash oil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410762207.2A CN104515741A (en) | 2014-12-13 | 2014-12-13 | Method for qualitative detection of hogwash oil |
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| CN104515741A true CN104515741A (en) | 2015-04-15 |
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| CN201410762207.2A Pending CN104515741A (en) | 2014-12-13 | 2014-12-13 | Method for qualitative detection of hogwash oil |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865220A (en) * | 2015-05-27 | 2015-08-26 | 中国矿业大学 | Method for detecting illegal cooking oil based on specific component and broadband terahertz absorption spectrum |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893577A (en) * | 2010-06-21 | 2010-11-24 | 罗付生 | Quick identification method of discolored hogwash oil (swill-cooked dirty oil) |
-
2014
- 2014-12-13 CN CN201410762207.2A patent/CN104515741A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893577A (en) * | 2010-06-21 | 2010-11-24 | 罗付生 | Quick identification method of discolored hogwash oil (swill-cooked dirty oil) |
Non-Patent Citations (2)
| Title |
|---|
| 崔晓举等: "地沟油检测技术研究进展", 《化学分析计量》 * |
| 崔晓举等: "比浊法测定潲水油中微量氯离子", 《粮油食品科技》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865220A (en) * | 2015-05-27 | 2015-08-26 | 中国矿业大学 | Method for detecting illegal cooking oil based on specific component and broadband terahertz absorption spectrum |
| CN104865220B (en) * | 2015-05-27 | 2017-07-14 | 中国矿业大学 | Waste oil detection method based on specific component and wideband terahertz absorption spectra |
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Application publication date: 20150415 |