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Soil extracting and measuring method of anion surfactant

A surfactant and extraction method technology, applied in the direction of color/spectral characteristic measurement, test sample preparation, material analysis by observing the influence of chemical indicators, etc., can solve the problem that LAS extraction and detection are not effective Standard method and other issues, to achieve the effect of convenient extraction process and stable method

Inactive Publication Date: 2011-09-14
OCEAN UNIV OF CHINA
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Problems solved by technology

At present, there are reports on the determination of LAS in soil by azure A spectrophotometry, but there is no effective standard method for the extraction and detection of LAS in soil.

Method used

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  • Soil extracting and measuring method of anion surfactant
  • Soil extracting and measuring method of anion surfactant
  • Soil extracting and measuring method of anion surfactant

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Select mixed soil samples to verify the method of the present invention, to prove the reliability of its use.

[0062] 1) Soil sample preparation: Take the anaerobic sludge from the sewage treatment plant and mix it with the collected soil in a certain proportion.

[0063] 2) Extraction of LAS in the sample

[0064] Carry out the extraction measurement and calculation of sample according to "the scheme establishment of extraction method", promptly take 10g soil sample, extract with 70% ethanol aqueous solution, the extraction agent dosage is 20mL, namely wherein the mass volume ratio g / mL of soil sample and ethanol aqueous solution is 1:2; the extraction temperature is 45°C, and the extraction time is 2 hours.

[0065] The detection method of the LAS concentration after extraction is the methylene blue spectrophotometric method determined by the State Environmental Protection Administration GB / T 7494-1987 water quality anionic surfactant, and the specific steps are sho...

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Abstract

The invention relates to a soil extracting and measuring method of an anion surfactant, which is characterized by comprising the following steps: firstly, using an ethanol water solution to extract the LAS (Laurylbenzenesulfonic Acidsodium Salt) in the soil; and measuring the total content of the LAS by utilizing a water quality anion surfactant methylene blue spectrophotometry in the national standard method GB 7494-87. The invention establishes a method for measuring the LAS in the soil. The method provided by the invention is stable; the extracting course is convenient and rapid; the method and the water quality anion surfactant methylene blue spectrophotometry can measure the LAS content in the soil under the same system; and the method has the comparability with the water quality LAS on the measuring result. In the method provided by the invention, the accuracy is 1.89%; the recovery rate is between 91.65% and97.04%; the detection limit is 0.020mg / kg; the accuracy and the detection limit are superior to an Azure A spectrophotometry, and the recovery rate is equal to the Azure A spectrophotometry; and the method for measuring the LAS in the soil is suitable and feasible.

Description

technical field [0001] The invention belongs to the technical field of measuring the total amount of anionic surfactant (LAS), and in particular relates to a method for extracting and measuring anionic surfactant soil, that is, extracting LAS in soil with ethanol solution, and combining methylene blue spectrophotometry to measure the amount of LAS in soil Total amount of LAS. Background technique [0002] Products containing synthetic detergents such as washing powder greatly facilitate people's lives, and surfactants are widely used in industry. However, the discharge of sewage containing surfactants leads to water quality deterioration, soil pollution, and even biological damage, which has aroused widespread concern. Therefore, there is a need for monitoring, analysis and rapid identification of anionic surfactants in environmental waters. At present, many countries, including China, use methylene blue spectrophotometry to measure the total amount of LAS in the water env...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N21/31G01N21/79
Inventor 万汉兴邹立
Owner OCEAN UNIV OF CHINA
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