Method for determining content of activated brownish black humic acid in active humic acid organic fertilizer
A technology of active humic acid and organic fertilizer, applied in the field of organic fertilizer, to achieve good reproducibility, good extraction effect, and accurate measurement results
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Embodiment 1
[0023] The assay method of activated brown black humic acid content in the active humic acid organic fertilizer comprises the following steps:
[0024] S1. Dissolution and extraction: Weigh 1.0g of the sample into a 250mL conical flask, add 100mL of citric acid-sodium citrate extract, shake the conical flask to wet the sample, and put a small funnel on the mouth of the conical flask , placed in a boiling water bath, heated for extraction; at the same time, a blank test was carried out; wherein, the citric acid-sodium citrate extract was prepared by mixing 70ml of citric acid solution with 930mL of sodium citrate solution and shaking well, and the citric acid-sodium citrate extract was prepared by mixing The concentration of the sodium citrate extract is 0.1mol / L, and the pH value is 6-7;
[0025] S2. Filtration: Take out the Erlenmeyer flask, cool to room temperature, transfer all the extract and residue into a 200mL volumetric flask, dilute with water to the mark, shake well ...
Embodiment 2
[0031] The assay method of activated brown black humic acid content in the active humic acid organic fertilizer comprises the following steps:
[0032] S1. Dissolution and extraction: Weigh 2.0g of the sample into a 250mL conical flask, add 100mL of citric acid-sodium citrate extract, shake the conical flask to wet the sample, and cover the conical flask with a small funnel , placed in a boiling water bath, heated for extraction; at the same time, a blank test was carried out; wherein, the citric acid-sodium citrate extract was prepared by mixing 70ml of citric acid solution with 930mL of sodium citrate solution and shaking well, and the citric acid-sodium citrate extract was prepared by mixing The concentration of the sodium citrate extract is 0.1mol / L, and the pH value is 6-7;
[0033] S2. Filtration: Take out the Erlenmeyer flask, cool to room temperature, transfer all the extract and residue into a 200mL volumetric flask, dilute with water to the mark, shake well and obtai...
Embodiment 3
[0039] The assay method of activated brown black humic acid content in the active humic acid organic fertilizer comprises the following steps:
[0040] S1. Dissolution and extraction: Weigh 1.0g~3.0g of the sample into a 250mL conical flask, add 100mL of citric acid-sodium citrate extract, shake the conical flask to wet the sample, and place a cap on the conical flask A small funnel was placed in a boiling water bath, heated and extracted; at the same time, a blank test was carried out; wherein, the citric acid-sodium citrate extract was prepared by mixing 70ml of citric acid solution with 930mL of sodium citrate solution and shaking well, and The concentration of the citric acid-sodium citrate extract is 0.1mol / L, and the pH value is 6-7;
[0041] S2. Filtration: Take out the Erlenmeyer flask, cool to room temperature, transfer all the extract and residue into a 200mL volumetric flask, dilute with water to the mark, shake well and obtain liquid A, dry filter with medium-speed...
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