Detection method for content of formic acid in feed additive

Abstract

The invention discloses a detection method for the content of formic acid in a feed additive. The detection method comprises the following steps: (1) accurately weighing a suitable amount of the feed additive; adding distilled water into the feed additive to carry out sufficient immersion so as to completely dissolve the formic acid in the feed additive into the distilled water; filtering to obtain a solution containing the formic acid; (2) sequentially adding sodium acetate, hydrochloric acid and a mercuric chloride-sodium chloride mixed solution into the solution containing the formic acid; finally, reducing mercuric chloride into mercurous chloride by using aldehyde in the formic acid; (3) not dissolving the mercurous chloride into water and filtering and drying sediment; weighing to obtain the content of the mercurous chloride; calculating the mass of the formic acid in a reaction system according to the mass of the generated mercurous chloride so as to calculate the content of the formic acid in the feed additive. The method does not need complicated pre-treatment, is simple to operate and is accurate and stable in result; used equipment is common and easy to obtain; the detection method is particularly suitable for automatically detecting feed factories and feed additive factories.

Description

technical field [0001] The invention relates to the detection of feed additive components, specifically a method for detecting formic acid content in feed additives with silicon dioxide and / or vermiculite as the carrier, and the feed additives referred to are usually preservatives, antifungal agents or acidity regulators The invention belongs to the technical field of feed additive or analysis and detection. [0002] Background technique [0003] Formic acid, chemical formula HCOOH, molecular formula CH 2 o 2 , commonly known as formic acid, is the simplest carboxylic acid. It can be miscible in any proportion with polar organic solvents such as water, ethanol and ether. Formic acid has a special structure, one of its hydrogen atoms is directly connected to the carboxyl group, and it can also be regarded as a hydroxy formaldehyde, so formic acid has the properties of both acid and aldehyde. Unlike other carboxylic acids, formic acid has a reducing property similar to th...

AI Technical Summary

Problems solved by technology

The acid-base titration method used in this standard cannot be used for the quantitative determination of formic acid in feed additives because it is affected by other organic acids (such as propionic acid, acetic acid, benzoic acid, etc.) in feed additives

Drawing lessons from the detection of formic acid in other industries, there are the following standards: 1. "GB / T 1628.5-2000 Determination of Formic Acid Content in Industrial Glacial Acetic Acid by Gas Chromatography", this standard provides a method for quantitative detection of formic acid, but the method requires Gas chromatographs are expensive

Although gas chromatographs have become popular in recent years, the thermal conductivity detectors required for formic acid detection are not available in every feed factory and feed additive factory, so the application of formic acid gas chromatography detection is limited

2. "GB / T 1628.4-2000 Determination of Formic Acid Content in Industrial Glacial Acetic Acid - Iodometric Method", the method described in this standard is cumbersome to operate and has a large workload, so it is not suitable for mass detection

3. "GB / T 15664-2009 Determination of Formic Acid Content in Fruits, Vegetables and Their Products - Gravimetric Method", according to the method described in this standard to detect formic acid in feed additives, it is found that the pretreatment is complicated and the recovery rate of formic acid is low