Method for rapidly quantifying concentration of humic acid in water
A humic acid and concentration technology, applied in the field of chemical analysis, can solve problems such as being unsuitable for rapid detection, and achieve the effect of rapid detection, simple and convenient operation
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Embodiment 1
[0022] According to the test method for rapid quantification of humic acid concentration in water of the present invention, based on the regression equation of turbidity and humic acid concentration in a solution containing humic acid, the humic acid is obtained by measuring and calculating the turbidity concentration. Specific steps are as follows:
[0023] 1. Preparation of the stock solution of humic acid: first prepare a sodium hydroxide solution with a concentration of 0.1mol / L and a volume of 500mL, then weigh 5g of humic acid and add it to the prepared NaOH solution, and fully stir until the humic acid All dissolved, sonicated for 30 min. Then, the humic acid solution was passed through a 0.45 μm filter membrane under the pressure of a vacuum pump to remove insoluble substances to prepare a humic acid stock solution, which was stored in the dark.
[0024] 2. Preparation of humic acid standard solution: Dilute the humic acid stock solution with purified water and prepa...
Embodiment 2
[0034] This comparative example provides a detection method for measuring the concentration of humic acid in water by spectrophotometry, which is related to the turbidity method in this embodiment. Since the detection accuracy of high-concentration samples by spectrophotometry is reduced and the concentration is too high to be detected, a 50 mg / L humic acid solution is selected for dilution. Specific steps are as follows:
[0035] 1. The preparation of the stock solution of humic acid and the standard solution of humic acid is as shown in Example 1.
[0036] 2. Determination of absorbance: use a spectrophotometer to measure the absorbance of the water sample at the wavelength of 254nm, set 3 parallel samples for each measurement, and take the average value to obtain the final absorbance value A i .
[0037] 3. Establish a regression equation: Linearly fit the absorbance of the humic acid solution at a wavelength of 254 nm and its corresponding concentration to establish a re...
Embodiment 3
[0043] In this example, the turbidity method and the spectrophotometric method are respectively used to measure the humic acid solution of unknown concentration in the column experiment, and the concentration values measured by the two methods are compared. Specific steps are as follows:
[0044] 1. The preparation of the stock solution of humic acid is as shown in Example 1. The humic acid stock solution was diluted with pure water and prepared into a humic acid solution with a concentration of about 100 mg / L, and its pH was adjusted to about 7 with dilute hydrochloric acid, and the background solution was pure water.
[0045]2. Column experiment: Wet-pack a filter material with a size of 0.5-1 mm into a filter column with an inner diameter of 1.6 cm and a length of 25 cm, pH is 6.5-7.5, and the temperature is room temperature. The prepared mixed solution was pumped into the column at a flow rate of 5 mL / min, and the background solution was passed through continuously for ...
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