Ion chromatography and voltammetric detection method for quickly determining anions in milk

Abstract

The invention provides an ion chromatography and voltammetry detection method for quickly detecting anions in milk, which specifically comprises the following step of completing the separation and determination of iodine ions and thiocyanate radical ions within five minutes by using an ion chromatograph with styrene and divinyl benzene copolymer as a filling agent and quaternary amine as an ion exchange functional group, a NaNO3-NaOH elution liquid and a voltammetric detector. The detection repeatability RSD% (n=3) of (I-) and (SCN-) are respectively 1.12% and 1.58%, and the degrees of accuracy (recovery rates) are respectively 98.3% and 93.6%. The separation and determination of (I-) and (SCN-) are completed within five minutes, and the contents are respectively 2.013 mg / L and 0.109 mg / L. The method has high sensitivity and accuracy and short analysis time and can be used for the routine analysis of milk.

Description

technical field [0001] The invention belongs to the field of detection and analysis, and in particular relates to an ion chromatography-voltammetric detection method for rapidly determining anions in milk. Background technique [0002] Thiocyanate and iodide ions in milk are important testing items for infant food safety. The "List of Non-edible Substances That May Be Illegally Added in Food and Food Additives That Are Easily Abuse (First Batch)" issued on December 12, 2008 clearly stipulates that thiocyanate is an illegally added substance, but there is no corresponding national standard test method. Thiocyanate is used by unscrupulous dairy farmers because it can prolong the shelf life of raw milk. Excessive intake will pose a great threat to human health. Iodine is an essential element for physical and intellectual development. Insufficient or excessive intake can cause goiter. The national standard stipulates that the content of iodine in every 100g of milk powder is ...

AI Technical Summary

Problems solved by technology

The "List of Non-edible Substances That May Be Illegally Added in Food and Food Additives That Are Easily Abuse (First Batch)" issued on December 12, 2008 clearly stipulates that thiocyanate is an illegally added substance, but there is no corresponding national standard test method

Ye Mingli and others analyzed thiocyanate ion, iodide ion and glyphosate in drinking water by KOH gradient elution in capillary ion chromatography and suppressed conductivity detection method. The analysis time of this method is more than 40 minutes and the cost is high.

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