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Method for measuring calcium content in feed

A method for measuring calcium content, which is applied in measuring devices, weighing materials, and analyzing materials, can solve the problems of easy sealing of indicators, high detection costs, and expensive instruments, and achieve easy operation, popularization, and low cost. Effect

Inactive Publication Date: 2020-11-20
GANSU AONONG FEED TECH CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the national standard method for the determination of calcium content in feed is potassium permanganate method "GB / T 6436-2018 Determination of Calcium in Feed", this method is suitable for the determination of calcium content in feed raw materials and feed products, and its determination principle is Destroy the organic matter in the feed, and turn the calcium into water-soluble Ca 2+ , quantitative precipitation with ammonium oxalate, and indirect titration of calcium content with potassium permanganate standard solution. The chemical reaction process is complex and accompanied by side reactions, so there are strict requirements on operation methods and operators, which cannot meet the simple and fast requirements of feed production enterprises
Another commonly used determination method is the second method in the "GB / T 6436-2018 Determination of Calcium in Feed", the EDTA complexometric titration method. Although the method is simple to operate, there are serious interference phenomena and no obvious changes in the end point. The aqueous solution of the indicator is unstable (the amount of the solid indicator is not easy to grasp) and the indicator is easy to seal, which makes the accuracy of the measurement result not high
Another method is flame atomic absorption spectrometry. Although this method has little interference, fast speed and good effect, it is only suitable for samples with low calcium content (in mk / kg), and the instrument is expensive and the detection cost is high. It is difficult to master the operation technology, and it is difficult to popularize and apply it in ordinary laboratories

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  • Method for measuring calcium content in feed
  • Method for measuring calcium content in feed
  • Method for measuring calcium content in feed

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] This embodiment provides a method for determining calcium content in feed, which can be carried out according to the following steps.

[0096] 1 Preparation of reagents required for the experiment

[0097] 1.1 concentrated nitric acid;

[0098] 1.2 Hydrochloric acid solution: mix hydrochloric acid and distilled water at a volume ratio of 1:3;

[0099] 1.3 Ammonia solution: mix ammonia water and distilled water at a volume ratio of 1:1;

[0100] 1.4 urea;

[0101] 1.5 Ammonium oxalate solution (42g / L): Weigh 42g ammonium oxalate and dissolve in 1000mL water;

[0102] 1.6 Ammonium oxalate solution (1g / L): Weigh 1g of ammonium oxalate and dissolve it in 1000mL of water;

[0103] 1.7 Calcium chloride solution (10g / L): Weigh 1g of calcium chloride solution and dissolve it in 100mL of water;

[0104] 1.8 Methyl red indicator (1g / L): Weigh 0.1g methyl red and dissolve in 100mL 95% ethanol;

[0105] 1.9 Quantitative slow filter paper: the diameter is 15cm, and the pore si...

Embodiment 2

[0178] This embodiment provides a method for determining calcium content in feed, which can be carried out according to the following steps.

[0179] 1 Preparation of sample decomposition solution

[0180] Weigh 4g of fishmeal from 5 different feed ingredients in a crucible, accurate to 0.0001g, carbonize carefully on an electric furnace, then put it into a muffle furnace and burn at 550°C for 3 hours until there are no carbon particles, take it out and cool it to room temperature, and put it in a crucible Add 10mL of 1+3 hydrochloric acid solution and 3 drops of concentrated nitric acid, boil carefully, transfer this solution into a 100mL volumetric flask, cool to room temperature, dilute with water to the mark, shake well, and become the sample decomposition solution.

[0181] 2 Precipitation of calcium ions

[0182] Accurately pipette 50mL of decomposition solution into a 250mL beaker, add water to dilute to 100ml, add 2 drops of methyl red indicator, add 1+1 ammonia water...

Embodiment 3

[0193] This embodiment provides a method for determining calcium content in feed, which can be carried out according to the following steps.

[0194] 1 Preparation of sample decomposition solution

[0195] Weigh 3g of fishmeal from 5 different feed ingredients into a crucible, accurate to 0.0001g, carbonize carefully on an electric furnace, then put it into a muffle furnace and burn at 550°C for 3 hours until there are no carbon particles, take it out and cool it to room temperature, and put it in a crucible Add 10mL of 1+3 hydrochloric acid solution and 3 drops of concentrated nitric acid, boil carefully, transfer this solution into a 100mL volumetric flask, cool to room temperature, dilute with water to the mark, shake well, and become the sample decomposition solution.

[0196] 2 Precipitation of calcium ions

[0197] Accurately pipette 30mL of decomposition solution into a 250mL beaker, add water to dilute to 100ml, add 2 drops of methyl red indicator, add 1+1 ammonia wat...

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Abstract

The invention discloses a method for determining the content of calcium in a feed, and belongs to the technical field of feed component detection. The determination method comprises the following steps: completely precipitating calcium ions in a to-be-determined feed into calcium oxalate by using a soluble oxalate solution, firing the calcium oxalate at 420-660 DEG C until the weight of generatedcalcium carbonate is constant, metering the mass of the generated calcium carbonate, and calculating the mass percentage content of calcium in the to-be-determined feed according to the mass of calcium in the calcium carbonate. According to the method, a titration analysis method in the prior art is converted into a gravimetric analysis method, so that the method solves the problems of complex andtedious operation steps, high requirements of an experiment method on detection personnel, long reaction process time, large measurement result error, narrow application range, high equipment cost and the like of an existing measurement method, can realize accurate measurement of calcium in the feed in a relatively short time, and has the advantages of being more accurate, quicker, low in cost, easy to operate and popularize and the like.

Description

technical field [0001] The invention relates to the technical field of feed component detection, in particular to a method for measuring calcium content in feed. Background technique [0002] Calcium is the most abundant mineral element in livestock and poultry. It mainly exists in teeth and bones. It plays an important role in the normal growth of bones and maintains the excitability of nerve cells. It also participates in the process of blood coagulation. Calcium deficiency in growing pigs will lead to bone deformation, slow growth, and rickets. Calcium deficiency in pregnant sows may affect the growth of the fetus. Long-term lack of calcium may cause postpartum paralysis. Lactating sows lack of calcium may lead to osteoporosis. produce osteomalacia. When calcium is deficient, growing chickens and ducks will have rickets and rickets, and growth will stagnate, while laying ducks will have a decrease in egg production rate, and produce thin-shelled or soft-shelled eggs. Ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
CPCG01N5/00
Inventor 张幻杨伟春曾诚隋晓东廖绍拔杨晨丁能水吴有林
Owner GANSU AONONG FEED TECH CO LTD
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