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Method for determining water-soluble chloride in feed

A determination method and chloride technology, applied in the direction of removing a certain component and weighing, etc., can solve the problems of high cost of equipment and reagents, large interference in judging the titration end point, complicated and tedious operation steps, etc., so as to reduce the cost of reagents and the Reagent safety risk, accurate and simple result determination, and the effect of simplifying the experimental process

Pending Publication Date: 2022-03-25
FUJIAN AONONG BIOLOGICAL TECH GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problems of the existing method for measuring water-soluble chloride in feed, such as complicated and cumbersome operation steps, large interference in judging the titration end point, large error in measurement results, long detection process, high cost of equipment and reagents, etc., and propose a A method for the determination of water-soluble chloride in feed that is simple and fast, has a wide range of applications, accurate and reliable analysis results, uses less reagents, reduces reagent control costs and laboratory safety risks

Method used

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  • Method for determining water-soluble chloride in feed
  • Method for determining water-soluble chloride in feed
  • Method for determining water-soluble chloride in feed

Examples

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Embodiment 1

[0071] A method for the determination of water-soluble chloride in feed is as follows:

[0072] 1 Preparation of reagents

[0073] The water used in the laboratory shall comply with the third-grade water specification in GB / T 6682, and the reagents used shall be of analytical grade unless otherwise specified.

[0074] 1.1 Silver nitrate solution (50g / L): Weigh 5g of silver nitrate, dissolve it in water and make up to 100mL.

[0075] 1.2 Sodium chloride solution (10g / L): Weigh 1g of sodium chloride, dissolve it in water and dilute to 100mL.

[0076] 1.3 Nitric acid solution (1:1): Mix concentrated nitric acid (65wt%-68wt%) and deionized water in a volume ratio of 1:1.

[0077] 2 Preparation of samples

[0078] Sampling according to GB / T 14699, preparing samples according to GB / T 20195, pulverizing the samples until they all pass through a 0.84mm (ie 20 mesh) sieve, mixing them evenly, putting them in sealed bags, and storing them for later use.

[0079] 3 Determination of s...

Embodiment 2

[0148] This embodiment provides a method for determining water-soluble chloride in feed, which can be carried out according to the following steps.

[0149] 1 Prepare the sample solution to be tested

[0150] Weigh 5g of two concentrated material samples into a 250mL beaker, accurate to 0.0001g, add 70-80mL of deionized water, stir rapidly with a magnetic stirrer for 10min, transfer all the samples to a 100mL volumetric flask, and dilute to the mark with water , shake well, transfer part of the solution to a 50mL centrifuge tube, centrifuge at 4000r / min for 2min, dry filter, and discard the initial 10-15mL filtrate.

[0151] 2 chloride ion precipitation

[0152] Accurately pipette 50mL of the filtrate into a 100mL beaker, add 5mL of nitric acid solution, preheat it in a 75°C electric constant temperature water bath for 5 minutes, add 10mL of silver nitrate solution, and keep it in a 75°C electric constant temperature water bath for 1min to check whether the chloride ion Prec...

Embodiment 3

[0163] This embodiment provides a method for determining water-soluble chloride in feed, which can be carried out according to the following steps.

[0164] 1 Prepare the sample solution to be tested

[0165] Weigh 5g of two premix samples into a 250mL beaker, accurate to 0.0001g, add 70-80mL of deionized water, stir rapidly with a magnetic stirrer for 10min, transfer all the samples to a 100mL volumetric flask, and dilute with water to Scale, shake well, transfer part of the solution to a 50mL centrifuge tube, centrifuge at 4000r / min for 2min, dry filter, and discard the initial 10-15mL filtrate.

[0166] 2 chloride ion precipitation

[0167] Accurately pipette 20mL of the filtrate into a 100mL beaker, add 5mL of nitric acid solution, preheat it in a 75°C electric constant temperature water bath for 5 minutes, add 10mL of silver nitrate solution, and keep it in a 75°C electric constant temperature water bath for 1min to check whether the chloride ion Precipitation is comple...

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Abstract

The invention relates to a method for determining water-soluble chlorides in feed, which comprises the following steps: 1) crushing a feed sample, adding the crushed feed sample into water, stirring, and fixing the volume with water to obtain a dispersion liquid; 2) filtering the dispersion liquid, transferring part of filtrate, adding a nitric acid solution and an excessive silver nitrate solution, and then separating to obtain a precipitate; and 3) cleaning the precipitate, drying in a dark place, cooling to room temperature in a dark place, weighing, and calculating to obtain the content of chloride in the feed sample. Compared with the prior art, the method adopts a gravimetric analysis method and is provided with an ion precipitation detection process, the determination method is simpler and more visual, the accuracy is higher, the repeatability is better, the operation is simpler, the reagent cost and the reagent safety risk are reduced, and the method can be used for detecting whether the chloride content of a product reaches the standard or not.

Description

technical field [0001] The invention belongs to the technical field of feed detection and relates to a method for determining water-soluble chloride in feed. Background technique [0002] At present, the commonly used method for determining water-soluble chloride in feed is the silver method, which is divided into direct method and indirect method. [0003] The direct method is a rapid determination method (GB / T 6439-1992), based on K 2 CrO 4 As an indicator, directly titrate the CI in the sample extract with silver nitrate standard solution - , although this method is simple, fast, and saves reagents, in actual detection, due to the complex composition of the feed, it contains more PO 4 3- , S 2- The mutation point of potassium chromate indicator at the equivalence point is not obvious, which leads to frequent over-titration and affects the accuracy of the measurement results. In addition, the extraction color of some feed and feed raw materials is dark, which affects ...

Claims

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Application Information

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IPC IPC(8): G01N5/04
CPCG01N5/04
Inventor 张幻张仙妹曾诚刘小成张敬学李广杰隋晓东吴有林
Owner FUJIAN AONONG BIOLOGICAL TECH GRP CO LTD
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