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Sodium sulfocyanate adulteration qualitative detection method for material milk

A technology of sodium thiocyanate and detection method, which is applied in the field of detection and chemical composition detection, and can solve problems such as human injury

Inactive Publication Date: 2008-02-20
INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, sodium thiocyanate is a poisonous product, and a small amount of ingestion will cause great harm to the human body.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Detection limit verification

[0031] 1) Prepare a blank raw milk sample;

[0032] 2) In addition, 5 blank milk samples were taken and mixed with different amounts of sodium thiocyanate to make 0.01%, 0.025%, 0.05%, 0.10%, and 0.50% sodium thiocyanate gradient positive samples.

[0033] 3) Detect with above-mentioned inventive method, detection result is as follows:

[0034] Spiked Sodium Thiocyanate Concentration

[0035] 2. Verification of interference factors

[0036] By analyzing the color reaction of ferric chloride, it is found that ferric trichloride can only react with sodium hydroxide to produce reddish-brown ferric hydroxide, which is similar to the color generated by the reaction in this test, which may be an interference factor, and further verification is required to verify the situation as follows:

[0037] Artificially mix different concentrations of sodium hydroxide into normal milk, and then use the above method to detect. The test resu...

Embodiment 2

[0042] The operation method is as follows:

[0043] 1. Materials:

[0044] 100ml volumetric flask, 50ml beaker, 18×180 test tube, 2ml graduated straw, 1ml graduated straw

[0045] 2. Reagents:

[0046] 1% ferric nitrate solution: Weigh 1g of ferric nitrate in a clean and dry small beaker, dissolve it with distilled water and set the volume to a 100ml volumetric flask.

[0047] 3. Sample testing:

[0048] 1) Draw about 2ml raw milk sample and inject it into the test tube.

[0049] 2) Slowly add about 1ml of ferric nitrate solution along the wall of the test tube (it takes about 1 minute to add 1ml of ferric nitrate solution).

[0050] 3) Observe the color change of the contact surface between the ferric nitrate and the milk sample within 5 minutes.

[0051] 4. Result judgment:

[0052] Yellow - no sodium thiocyanate, sodium thiocyanate negative;

[0053] Orange (or orange) - trace sodium thiocyanate, sodium thiocyanate positive;

[0054] Red - moderate sodium thiocyanat...

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PUM

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Abstract

The utility model relates to a test method, in particular to a test method for adulteration of sodium sulfocyanate in raw milk, belonging to the technical filed of chemical composition test. In the test method for adulteration of sodium sulfocyanate in raw milk, the test is conducted according to the following steps: adding in the ferric salt solution of certain concentration in raw milk sample and judging whether the adulteration of sodium sulfocyanate exists in the raw milk sample according to the color change of the contact surface of ferric salt and raw milk sample. The test limit of the method is 0.01%.

Description

technical field [0001] The invention relates to a detection method, in particular to a detection method for sodium thiocyanate adulteration in raw milk. The invention belongs to the technical field of chemical component detection. Background technique [0002] At present, there is no detection method for raw milk mixed with sodium thiocyanate, which cannot well control the entry of adulterated milk into the factory. Raw milk or milk powder mixed with sodium thiocyanate can effectively inhibit bacteria, and it is one of the adulterated substances used by illegal dairy farmers. However, sodium thiocyanate is a poisonous product, and a small amount of ingestion will cause great harm to the human body. Blood-red ferric thiocyanate is generated by the reaction of sodium thiocyanate and iron salt, so as to qualitatively detect whether sodium thiocyanate is mixed in raw milk. It is used to control the acceptance of raw milk quality. Contents of the invention [0003] The purp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N33/04
Inventor 高娃王丹慧
Owner INNER MONGOLIA MENGNIU DAIRY IND (GRP) CO LTD
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