Method for determining content of activated brownish black humic acid in active humic acid organic fertilizer

Abstract

The invention discloses a method for determining the content of activated brownish black humic acid in an active humic acid organic fertilizer. The method comprises the following steps of: S1, dissolving and extraction, namely, weighing 1.0-3.0 g of sample in a 250 mL conical flask, adding 100 mL of citric acid-sodium citrate extracting solution, shaking the conical flask to wet the sample, covering the conical flask with a small funnel, placing the conical flask in a boiling water bath, carrying out heating and extracton, and meanwhile, carrying out a blank test; and S2, filtering, namely taking out the conical flask, cooling it to room temperature, completely transferring an extract and residues into a 200 mL volumetric flask, diluting the extract and residues with water to a scale, uniformly shaking to obtain a solution A, performing dry filtration with medium-speed qualitative filter paper, discarding about 5ml of initial solution, and then filtering out 150mL-180mL of filtrate to obtain a solution B. According to the method, the content of the activated brownish black humic acid in the active humic acid organic fertilizer is determined by adopting an acid precipitation volumetric method, so that the allowable difference of the measurement result of the activated humic acid is relatively small, and the measurement result is relatively accurate.

Description

technical field [0001] The invention relates to the technical field related to organic fertilizers, in particular to a method for determining the content of activated brown black humic acid in active humic acid organic fertilizers. Background technique [0002] Humic acid is a macromolecular organic substance that exists widely in nature and is widely used in various fields such as agriculture, forestry, animal husbandry, petroleum, chemical industry, building materials, medicine and health, and environmental protection. Especially now that the construction of ecological agriculture, pollution-free agricultural production, green food, pollution-free environmental protection, etc. are advocated, "humic acid" is highly respected; facts have proved that human life and survival are inseparable from humic acid, and humic acid is an important component of animals and plants. Remains, mainly the remains of plants, are a type of organic matter formed and accumulated through a series...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for determining the content of activated brown and black humic acid in active humic acid organic fertilizers, so as to solve the problem mentioned in the above background technology in order to control the product quality of humic acid organic fertilizers and promote the health of humic acid synergistic fertilizers. development, it is necessary to detect the content of activated brown and black humic acid in the product; but there is still no scientific and accurate method for the determination of the content of activated brown and black humic acid in organic fertilizers