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Determination method of activated humic acid

A determination method, humic acid technology, applied in the field of analytical chemical detection, can solve the problems of great influence on the determination results, inaccurate measurement results, cumbersome gravimetric operation, etc., and achieve great significance, great quality control and good reproducibility Effect

Active Publication Date: 2017-08-18
SHANDONG AGRI UNIV FERTILIZER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The gravimetric method is scientific and can solve some problems caused by the common volumetric method, but the gravimetric method is cumbersome to operate and the process is long; factors that affect the detection accuracy of the gravimetric method include the type of extractant, the amount of sample weighed, and the extraction time , extraction temperature, selection of adsorption resin, etc. Among them, the selection of extraction agent and the selection of adsorption resin have a greater impact, and there are many error points in the entire operation process, which is easy to cause error accumulation, resulting in inaccurate measurement results
Determination of humic acid content in humic acid fertilizer products by traditional volumetric method Existing Cl - , urea, Fe 2+ The impact of other reducing ions has a greater impact on the measurement results

Method used

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  • Determination method of activated humic acid
  • Determination method of activated humic acid
  • Determination method of activated humic acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Embodiment 1, the process flow chart of activated humic acid assay is as figure 1 shown.

[0063] Accurately weigh 1.000g of high-concentration (nutrient content greater than 45%) humic acid compound fertilizers from different bags (accurate to 0.0002g when weighing) into 250mL conical flasks, and record the sample names respectively, as shown in Table 1 shown;

[0064] (1) Determination method of activated brown black humic acid:

[0065] 1) Dissolution and extraction: add 100mL of citric acid-sodium citrate mixed extract to each group of samples above, shake to make the samples wet, cover a small funnel on the mouth of the Erlenmeyer flask, and place the Erlenmeyer flask in a vibrating boiling water bath Heating and extracting for 60 minutes, the vibration amplitude is 20-30rpm, and a blank test is done at the same time;

[0066] 2) Filtration: Take out the Erlenmeyer flask, cool to room temperature, transfer all the extract and residue into a 200mL volumetric flas...

Embodiment 2

[0108]Example 2. The difference between this example and Example 1 is that 2.000 g of humic acid compound fertilizers with medium concentration (nutrient content 35%-45%) from different bags were accurately weighed (accurate to 0.0002g) in the 250mL Erlenmeyer flask, record the sample name respectively, as shown in table 2; all the other steps are with embodiment 1, and calculation result is as shown in table 2:

[0109] Table 2 is the detection result of activated humic acid of medium concentration (nutrient content 35%-45%) humic acid compound fertilizer

[0110]

Embodiment 3

[0111] Example 3, the difference between this example and Example 1 is that 3.000g of humic acid compound fertilizers with low concentrations (nutrient content less than 35%) from different bags were accurately weighed (accurate to 0.0002g when weighing) ) in the 250mL Erlenmeyer flask, record the sample name respectively, as shown in table 3; all the other steps are with embodiment 1, and calculation result is as shown in table 3:

[0112] Table 3 is the detection result of activated humic acid of low concentration (nutrient content less than 35%) humic acid compound fertilizer

[0113]

[0114]

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Abstract

The invention provides a determination method of activated humic acid, and particularly relates to an activated humic acid content determination method of humic acid composite fertilizer, humic acid compound fertilizer, and humic-acid-contained compound fertilizer; the activated humic acid includes activated brownish black humic acid and activated fulvic acid, wherein the content of the activated brownish black humic acid is determined by a method of dissolution of citric acid-sodium citrate mixing fluid, acid settlement, alkali dissolution, and then by potassium dichromate oxidization; the content of activated fulvic acid is determined by a method of dissolution of citric acid-sodium citrate mixing fluid, acid settlement, filter liquid resin absorption, NaOH absorption, and potassium dichromate oxidization; the sum of the tested contents of activated brownish black humic acid and activated fulvic acid is the content of humic acid. The method has the advantages of being simple in operation, high in accuracy, and capable of meeting the operation demand of the most enterprises and quality inspection units while controlling the testing bias well.

Description

technical field [0001] The invention relates to the technical field of analytical chemical detection, and provides a method for determining activated humic acid, in particular to a method for determining the content of activated humic acid in humic acid compound fertilizers, humic acid compound fertilizers, and humic acid-containing compound fertilizers. Background technique [0002] Humic acid is a mixture of aromatic amorphous macromolecular compounds rich in oxygen-containing functional groups such as carboxyl, phenolic hydroxyl, and methoxyl groups. Its synergistic effect on chemical fertilizers is very obvious. has become very common. The humic acid compound fertilizer has a huge production capacity, and the most important part of the humic acid synergistic fertilizer is activated humic acid. Usually, activated humic acid is used to characterize the activation degree of humic acid in the fertilizer. At present, many companies directly add humic acid raw powder to ferti...

Claims

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Application Information

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IPC IPC(8): G01N1/34G01N31/16
CPCG01N1/34G01N31/16
Inventor 丁方军武丽萍杨一张娟袁亮吴钦泉郭新送
Owner SHANDONG AGRI UNIV FERTILIZER TECH CO LTD
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