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Method for determining iron content in nori with flame atomic absorption spectrometry

A technology of flame atomic absorption and spectrometry, which is applied in the field of determination of iron content in laver by flame atomic absorption spectrometry, can solve the problems of long consumption of iron content and large amount of solvent used, and achieve low blank value, enhanced oxidative property, shortened The effect of digestion time

Inactive Publication Date: 2014-01-22
SUZHOU GUOHUAN ENVIRONMENT DETECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Determination of iron content by conventional flame atomic absorption spectrometry takes a long time, the amount of solvent used is large, and the environmental pollution introduced by the solvent is also serious

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0032] c. Preparation of sample solution: add twice distilled water to the volumetric flask to make the volume up to the mark, and prepare a sample solution;

[0033] d. Preparation of blank solution: Same as step b, but only add the same amount of digestion solvent as in step b, heat it in a microwave oven, take out the reaction vessel and wait for it to cool to room temperature, take out the blank test solution and place it in a volumetric flask with a medium capacity as in step c, Add double-distilled water to the volumetric flask to set the volume and scale, and prepare a blank solution for later use;

[0034] e. Preparation of standard solution: use nitric acid with a concentration of 1% as diluent, prepare 1mg / mL iron standard solution into standard solutions of different concentrations for later use;

[0035] f. The instrument measures the iron content in the exhaust gas. The instrument includes: a flame atomic absorption spectrometer and an iron atom spectrum lamp. The...

Embodiment 1

[0049] Clean and air-dry commercially available wild seaweed, put it into a clean container, put the clean container in a constant temperature oven at 80-85°C, dry it to a constant mass, grind it into powder with a mortar, and pass through an 80-mesh sieve to obtain a seaweed sample ; Accurately weigh 1.38g of seaweed sample, put it into a Teflon microwave pressurized digestion tank, add 20mL of a mixed solution of nitric acid and perchloric acid with a volume ratio of 4:1 and soak for 45-50min, then seal the digestion tank with a cover After that, put it in the microwave oven and heat it for 2 minutes with "low fire" and then with "medium-high fire" for 4 minutes. Take out the reaction vessel and cool it to room temperature in a fume hood. Unscrew the lid and check that the digestion solution is transparent. , use neutral filter paper to filter the test solution, take the filtrate and place it in a 50mL volumetric flask, then add twice distilled water to the volumetric flask t...

Embodiment 2

[0057] The only difference from Example 1 is that the volume ratio of nitric acid and perchloric acid in the added digestion solvent is 3.5:1. After unscrewing the cover, the digestion solution is translucent.

[0058] Other experimental conditions are the same as in Example 1, prepare 6 parallel sample solutions and digestion solutions, measure the absorbance of the iron element in the sample by means of a spectrometer, calculate the content of the iron element in the 6 samples according to the linear regression equation, and take the average value. The measured iron content is: 542.38 ug / g, 539.43 ug / g, 540.42 ug / g, 541.08 ug / g, 540.29 ug / g, 552.41 ug / g, and the calculated average value is 542.67 ug / g. Example 1, the measured content of iron in laver is low, comprehensive analysis shows that under the digestion solvent of nitric acid and perchloric acid with a volume ratio of 3:1, iron is not completely dissolved.

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Abstract

The invention provides a method for determining iron content in nori with a flame atomic absorption spectrometry. The method comprises the following steps: dyeing a sample at a high temperature to remove water; immersing the sample into a digestion solvent for long time and then pre-treating under high-temperature, high-pressure and closed conditions, so as to rapidly transfer iron in the sample into the digestion solvent at maximum, wherein the digestion solvent is a mixed acid of nitric acid and perchloric acid at a volume ratio of 4:1; heating and digesting by using a microwave oven so as to achieve a high temperature instantly and shorten the digestion time. According to the method provided by the invention, the problems of a traditional method that the consumed time is long and the use amount of solvents is great when the flame atomic absorption spectrometry is used for determining microelements and the environmental pollution caused by the solvents is serious are solved; the method has the advantages of rapidness and convenience, good repeatability and good accuracy, and is applicable to determining the microelements of similar materials.

Description

technical field [0001] The invention relates to a method for determining the iron content in laver, in particular to a method for determining the iron content in laver by flame atomic absorption spectrometry. Background technique [0002] Seaweed is an algae plant that grows on shallow sea rocks. It is rich in protein, polysaccharides, various amino acids, fats, vitamins, inorganic salts, and various trace elements such as iron, magnesium, zinc, calcium, copper, etc. It is of high taste Nutritional and health food with high nutritional value and medicinal value. Among them, iron element has hematopoietic function in the human body, participates in the synthesis of blood protein, cytochrome and various enzymes, promotes growth, and also transports oxygen and nutrients in the blood. If the human body lacks iron, microcytic anemia, immune Decreased function and metabolic disorders, therefore, the human body needs to ensure iron intake in the daily diet. [0003] Seaweed is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/44G01N21/31
Inventor 徐晓华刘晓庆
Owner SUZHOU GUOHUAN ENVIRONMENT DETECTION
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